MATHEMATICAL PRACTITIONERS AND INSTRUMENT MAKERS

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Silvio A. Bedini

Geographical Listing

CONNECTICUT
Coventry: Daniel Burnap (1759-1838); surveying instruments and clocks.
Danbury: Benjamin Platt (1757-1833); compasses and clocks.
East Windsor: Daniel Burnap (1759-1838); surveying instruments and clocks.
Hartford: Enos Doolittle (1751-1806); surveying and navigational instruments, compasses, and clocks.
Litchfield: Benjamin Hanks (1755-1824); surveying instruments and clocks.
Truman Hanks (fl. 1808); surveying instruments.
Benjamin Platt (1757-1833); compasses and clocks.
Mansfield: Benjamin Hanks (1755-1824); surveying instruments.
Truman Hanks (fl. 1808); surveying instruments.
New Haven: Isaac Doolittle (1721-1800); clocks and scientific instruments.
Isaac Doolittle, Jr. (1759-1821); surveying instruments and clocks.
Sibley & Marble (late 18th century); clocks and mathematical instruments.
New Milford: Benjamin Platt (1757-1833); compasses and clocks.
Newtown: Ziba Blakeslee (1768-1834); surveying instruments.
Norwich: Thomas Harland (1735-1807); surveying instruments and clocks.
Windham: Gurdon Huntington (1763-1804); clocks and surveying and other instruments.
Woodstock: Peregrine White (1747-1834); surveying instruments and clocks.
----: Smith, Cordial (fl. 1775); surveying instruments.
DELAWARE
Wilmington: George Crow (c. 1726-1772); surveying instruments and clocks.
MARYLAND
Baltimore: Benjamin Banneker (c. 1734-1806), practitioner.
Andrew Ellicott (1754-1820), practitioner; surveying and astronomical instruments.
Benjamin K. Hagger (c. 1769-1834); mathematical and surveying instruments.
Frederick: Frederick A. Heisely (1759-1839); clocks and mathematical instruments.
Nottingham: Benjamin Chandlee, Jr. (1723-1791); clocks and surveying instruments.
Chandlee & Bros. (fl. 1790-1791); clocks and surveying instruments.
Ellis Chandlee (1755-1816); surveying instruments and clocks.
Ellis Chandlee & Bros. (fl. 1791-1797); clocks and surveying instruments.
Isaac Chandlee (1760-1813); surveying instruments and clocks.
MASSACHUSETTS
Boston: Jedidiah Baldwin (c. 1777-1829); surveying instruments.
Aaron Breed (1791-1861); surveying instruments.
Bartholomew Burges (fl. 1789); scientific instruments.
Jere Clough (18th century); surveying instruments.
John Dabney, Jr. (fl. 1739); mathematical instruments.
Jonathan Dakin (fl. 1745); mathematical instruments and balances.
John Dupee (fl. after 1761); surveying instruments.
Samuel Grainger (fl. 1719), practitioner.
Stephen Greenleaf (1704-1795); mathematical instruments.
Thomas Greenough (1710-1785); mathematical, surveying, astronomical, and nautical
instruments.
William Greenough (fl. 1785); surveying instruments.
Isaac Greenwood, Sr. (c.1725-1750), practitioner.
Isaac Greenwood, Jr. (1730-1803); mathematical instruments.
Benjamin K. Hagger (c. 1769-1834); mathematical and surveying instruments.
James Halsie I (fl. 1674), practitioner.
James Halsy II (1695-1767); mathematical and surveying instruments.
John Halsy (fl. 1700); mathematical instruments.
Joseph Halsy (fl. 1697-1762); surveying instruments.
Rowland Houghton (1678-1744); surveying instruments.
Andrew Newell (1749-1798); surveying instruments.
Joseph Newell (fl. 1800-1813); surveying instruments.
Joseph Pope (1750-1826); scientific instruments and clocks.
Nathan Prince (fl. 1743), practitioner; scientific instruments.
Paul Revere (1735-1818); gunnery instruments.
Charles Thacher (18th century); surveying instruments.
Samuel Thaxter (1769-1842); surveying, nautical, and mathematical instruments.
William Williams (1737/8-1792); mathematical and nautical instruments.
Brookfield: John Potter (1746-1818); surveying instruments.
Hanover: John Bailey II (1752-1823); surveying instruments.
Lanesboro: Benjamin Platt (1757-1833); surveying instruments, clocks, and compasses.
Lynn: John Bailey II (1752-1823); surveying instruments.
Nantucket: Peter Folger (1617-1690), practitioner(?).
Walter Folger (1765-1849), practitioner; clocks and astronomical instruments.
Newburyport: Gideon Fairman (1774-1827); mathematical instruments.
Hooker & Fairman (before 1810); mathematical instruments.
Northampton: Jedidiah Baldwin (c.1777-1829); surveying instruments.
Stiles & Baldwin (fl.1791); surveying instruments.
Stiles & Storrs (fl.1792); surveying instruments.
Plymouth: Benjamin Warren (fl.1740-1790); surveying and nautical instruments.
Salem: Jedidiah Baldwin (c.1777-1829); surveying instruments.
Samuel Emery (1787-1882); mathematical instruments.
John Jayne (late 18th century); mathematical instruments.
Benjamin King (1740-1804); nautical instruments.
Daniel King (1704-1790); mathematical instruments.
John Prince (1751-1836), practitioner; scientific instruments.
Southwick: Amasa Holcomb (1787-1875); surveying and mathematical instruments.
NEW HAMPSHIRE
Exeter: Benjamin C. Gilman (1763-1835); mathematical instruments and clocks.
Hanover: Jedidiah Baldwin (c.1777-1829); surveying instruments.
Newmarket: John Kennard (1782-1861); surveying instruments.
Portsmouth: Thomas S. Bowles (c.1765-1821); surveying instruments.
Walpole: Gurdon Huntington (1763-1804); clocks and surveying and other instruments.
NEW JERSEY
Elizabeth: Aaron Miller (fl. 1748-1771); surveying instruments, clocks, and compasses.
Wistarburg: Richard Wistar (fl. 1752); glass and thermometric instruments.
NEW YORK
Fishkill: John Bailey (fl. 1778); surveying and surgical instruments.
New York: Thomas Biggs (fl. 1792); surveying instruments.
Bulmain & Dennies (fl. 1799); nautical instruments.
H. Caritat (fl. 1799); astronomical prints.
John Donegan (fl. 1787); barometers, thermometers, and philosophical instruments.
W. Fosbrook (fl. 1786); surgical and dental instruments.
Joseph Gatty (fl. 1794); barometers, thermometers and philosophical instruments.
James Ham (fl. 1754-1764); mathematical instruments.
William Hinton (fl. 1772); mathematical instruments.
A. Lamb & Son (fl. late 18th century); mathematical instruments.
Anthony Lamb (1703-1784); mathematical instruments.
John Lamb (1735-1800); mathematical instruments.
M. Morris (fl. 1785); protractors.
Widow Balthaser Sommer (fl. 1753); optical instruments.
Charles Walpole (fl. 1746); mathematical instruments.
James Youle (1740-1786); surgical instruments.
John Youle (fl. 1786); surgical instruments.
OHIO
Columbus: Augustus Platt (1793-1886); mathematical instruments.
Benjamin Platt (1757-1833); surveying instruments and clocks.
Gallipolis: Joseph (fl. 1792) and Francois Devacht; watches, compasses, and sundials.
PENNSYLVANIA
Bucks County: W. L. Potts (late 18th century); surveying instruments.
George Wall, Jr. (fl. 1788); surveying instruments.
Germantown: Christopher Sower (c. 1724-1740); mathematical instruments and clocks.
Christopher Witt (fl. 1710-1765); mathematical instruments and clocks.
Harrisburg: Frederick A. Heisely (1759-1839); clocks and mathematical instruments.
George Heisely (1789-1880); clocks and mathematical instruments.
Lancaster: George Ford (late 18th century to 1842); surveying and nautical instruments.
George Ford II (fl. 1842); surveying and nautical instruments.
Frederick A. Heisely (1759-1839); clocks and mathematical instruments.
George Hoff (1740-1816); clocks, surveying instruments.
Thomas Mendenhall (fl. 1775); mathematical instruments and clocks.
Norristown: David Rittenhouse (1732-1796), practitioner; astronomical and surveying instruments.
Philadelphia: Owen Biddle (1737-1799), practitioner.
Thomas Biggs (fl. 1792-1795); surveying instruments.
Isaac Brokaw (fl. 1771).
Benjamin Condy (fl. 1756, d. 1798); mathematical instruments and sand glasses.
William Davenport (1778-1829); surveying and mathematical instruments.
William Dean (?-1797); surveying and nautical instruments.
George Evans (fl. 1796, d. 1798); mathematical instruments.
Martin Fisher (fl. 1790); glass instruments.
Joseph Gatty (fl. 1794); barometers, thermometers, and philosophical instruments.
Bryan Gilmur (end of 18th century); mathematical instruments and clocks.
Thomas Godfrey (1704-1749); improved reflecting backstaff.
John Gould (fl. 1794); nautical, surveying, and optical instruments.
Theophilus Grew (fl. 1753), practitioner.
James Ham (fl. 1754-1764); mathematical instruments.
James Ham, Jr. (fl. 1780); mathematical instruments.
Alloysius Ketterer (fl. 1789); glass instruments.
Anthony Lamb (1703-1784); mathematical instruments.
Thomas Pryor (fl. 1778); mathematical instruments.
Benjamin Rittenhouse (1740-c.1820); surveying and astronomical instruments.
David Rittenhouse (1732-1796), practitioner; astronomical and surveying instruments.
Christopher Sower [Sauer] (c. 1724-1740); mathematical instruments and clocks.
Charles Taws (fl. 1795); mathematical instruments.
Henry Voight (1738-1814); clocks, watches, and astronomical instruments.
John Whitney (fl. 1801); mathematical and optical instruments.
Thomas Whitney (fl. 1798-1823); mathematical and optical instruments.
John Wood (fl. 1790); compasses.
Pittsburgh: Frederick A. Heisely (1759-1839); clocks and mathematical instruments.
West Bradford: Joel Baily (1732-1797), practitioner.
RHODE ISLAND
Newport: William G. Hagger (c.1744-1830?); quadrants.
King & Hagger (1759/60); mathematical and nautical instruments.
Benjamin King (1707-1786); mathematical and nautical instruments.
Samuel King (1748-1819); mathematical instrument.
Paul Pease (fl. 1750); quadrants.
Providence: William Hamlin (1772-1869); mathematical, astronomical, and nautical instruments.
SOUTH CAROLINA
Charleston: Charles Blundy (fl. 1753); thermometric instruments.
Robert Clark (fl. 1785); nautical, surveying, and optical instruments.
James Jacks (fl. 1780's); mathematical and surveying instruments.
VERMONT
Bradford: James Wilson (1763-1855); globes.
VIRGINIA
Winchester: Goldsmith Chandlee (c.1746-1821); surveying and astronomical instruments and clocks.
Anthony Lamb (1703-1784); mathematical instruments.

TYPES OF INSTRUMENTS AND THEIR MAKERS

(Categories based on specific designations noted in advertisements)

ASTRONOMICAL

Caritat, H. (fl. 1799), New York.

Chandlee, Goldsmith (c.1746-1821), Winchester, Va.; also made surveying instruments and clocks.

Ellicott, Andrew (1754-1820), Baltimore; also made surveying instruments.

Folger, Walter, Jr. (1765-1849), Nantucket, Mass.; also made surveying instruments.

Greenough, Thomas (1710-1785), Boston; also made mathematical, surveying, and nautical instruments.

Hamlin, William (1772-1869), Providence, R.I.; also made mathematical and nautical instruments.

Holcomb, Amasa (1787-1875), Southwick, Mass.; also made surveying instruments.

Rittenhouse, Benjamin (1740-c.1820), Philadelphia; also made surveying instruments.

Rittenhouse, David (1732-1796), Philadelphia and Norristown, Pa.; also made surveying instruments.

Voight, Henry (1738-1814), Philadelphia; also made clocks and watches.

GLASS AND THERMOMETRIC

Blundy, Charles (fl. 1753), Charleston, S.C.; also made watches.

Donegan, Joseph (fl. 1787), New York and Philadelphia; also made philosophical instruments.

Fisher, Martin (fl. 1790), Philadelphia.

Gatty, Joseph (fl. 1794), New York and Philadelphia; also made philosophical instruments.

Ketterer, Alloysius (fl. 1789), Philadelphia.

Wistar, Richard (fl. 1752), Wistarburg, N.J.

HOROLOGICAL

Blundy, Charles (fl. 1753), Charleston, S.C.; also made thermometric instruments.

Burnap, Daniel (1759-1838), East Windsor and Coventry, Conn.; also made surveying instruments.

Chandlee, Benjamin (1723-1791), Nottingham, Md.; also made surveying instruments.

Chandlee & Bros. (fl. 1790-1791), Nottingham, Md.; also made surveying instruments.

Chandlee, Ellis (1755-1816), Nottingham, Md.; also made surveying instruments.

Chandlee, Goldsmith (1751-1821), Winchester, Va.; also made astronomical and surveying instruments.

Chandlee, Isaac (1760-1813), Nottingham, Md.; also made surveying instruments.

Crow, George (c.1726-1772), Philadelphia; also made surveying instruments.

DeVacht, Joseph and Francois (fl. 1792), Gallipolis, Ohio; also made compasses and sundials.

Doolittle, Enos (1751-1806), Hartford, Conn.; also made surveying and nautical instruments.

Doolittle, Isaac (1721-1800), New Haven, Conn.; also made scientific instruments.

Doolittle, Isaac Jr. (1759-1821), New Haven, Conn.; also made surveying instruments.

Gilman, Benjamin C. (1763-1835), Exeter, N.H.; also made mathematical instruments.

Gilmur, Bryan (fl. end of 18th century), Philadelphia; also made mathematical instruments.

Harland, Thomas (1735-1807), Norwich, Conn.; also made surveying instruments.

Heisely, Frederick A. (1759-1839), Frederick, Md.; also made mathematical and surveying instruments.

Heisely, George (1789-1880), Harrisburg, Pa.; also made mathematical instruments.

Hoff, George (1740-1816), Lancaster, Pa.; also made surveying instruments.

Huntington, Gurdon (1763-1804), Windham, Conn., and Walpole, N.H.; also made surveying and other instruments.

Kennard, John (1782-1861), Newmarket, N.H.; also made surveying instruments.

Mendenhall, Thomas (fl. 1775), Lancaster, Pa.; also made mathematical instruments.

Miller, Aaron (fl. 1748-1771), Elizabethtown, N.J.; also made compasses and surveying instruments.

Platt, Benjamin (1757-1833), Danbury, Litchfield, and New Milford, Conn.; Lanesboro, Mass.; Columbus, Ohio; also made compasses and surveying instruments.

Pope, Joseph (1750-1826), Boston; also made scientific instruments.

Sibley & Marble (Clark Sibley and Simeon Marble) (late 18th century), New Haven, Conn.; also made mathematical instruments.

Sower, Christopher (c. 1724-1740), Germantown and Philadelphia, Pa.; also made mathematical instruments.

Voigt, Henry (1738-1814), Philadelphia; also made astronomical instruments.

White, Peregrine (1747-1834), Woodstock, Conn.; also made surveying instruments.

Witt, Christopher (practitioner) (fl. 1710-1765), Germantown, Pa.; also made mathematical instruments.

MATHEMATICAL (GENERAL)

Condy, Benjamin (fl. 1756-1792, d. 1798), Philadelphia.

Dabney, John, Jr. (fl. 1739), Boston.

Dakin, Jonathan (fl. 1745), Boston; also made balances.

Davenport, William (fl. 1800-1820), Philadelphia; also made surveying instruments.

Doolittle, Isaac (1721-1800), New Haven, Conn.; also made clocks.

Emery, Samuel (late 18th century), Salem, Mass.

Evans, George (fl. 1796, d. 1798), Philadelphia.

Fairman, Gideon (1774-1827), Newburyport, Mass.

Gilman, Benjamin C. (1763-1835), Exeter, N.H.; also made clocks.

Gilmur, Bryan (end of 18th century), Philadelphia; also made clocks.

Greenleaf, Stephen (fl. 1745), Boston.

Greenough, Thomas (1710-1785), Boston; also made surveying, astronomical, and nautical instruments.

Greenwood, Isaac, Jr. (1730-1803), Boston.

Hagger, Benjamin K. (c.1769-1834), Boston and Baltimore; also made surveying instruments.

Halsy, James, II (1695-1767), Boston; also made surveying instruments.

Halsy, John (fl. 1700), Boston.

Ham, James (fl. 1754-1764), New York and Philadelphia.

Ham, James, Jr. (fl. 1780), Philadelphia.

Hamlin, William (1772-1869), Providence, R.I.; also made nautical and astronomical instruments.

Heisely, Frederick (1759-1839), Frederick, Md., and Lancaster, Harrisburg, and Pittsburgh, Pa.; also made clocks and surveying instruments.

Heisely, George (1789-1880), Harrisburg, Pa.; also made clocks.

Hinton, William (fl. 1772), New York.

Hooker & Fairman (before 1810), Newburyport, Mass.

Jacks, James (fl. 1780's), Charleston, S.C.; also made surveying instruments.

Jayne, John (late 18th century), Salem, Mass.

King & Hagger (1759/60 to early 1760's), Newport, R.I.; also made nautical instruments.

King, Benjamin (1707-1786), Newport, R.I.; also made nautical instruments.

King, Daniel (1704-1790), Salem, Mass.

King, Samuel (fl. 1786), Newport, R.I.

Lamb, A. & Son (1780's), New York.

Lamb, Anthony (1703-1784), Virginia, Philadelphia, New York, and Hunter's Key, N.Y.; also made surveying and nautical instruments.

Lamb, John (1735-1800), New York; also made nautical and surveying instruments.

Mendenhall, Thomas (fl. 1775), Lancaster, Pa.; also made clocks.

Newell, Andrew (1749-1798), Boston; also made compasses and surveying instruments.

Platt, Augustus (1809-1886), Columbus, Ohio; also made surveying instruments.

Pryor, Thomas (fl. 1778), Philadelphia.

Revere, Paul (1735-1818), Boston, Mass.

Sibley & Marble (late 18th century), New Haven, Conn.; also made clocks and watches.

Sower, Christopher (c. 1724-1740), Germantown and Philadelphia, Pa.; also made clocks.

Taws, Charles (fl. 1795), Philadelphia.

Thaxter, Samuel (1769-1842), Boston; also made surveying and nautical instruments.

Walpole, Charles (fl. 1746), New York.

Whitney, John (fl. 1801), Philadelphia; also made optical instruments.

Whitney, Thomas (fl. 1798-1821), Philadelphia; also made optical and surveying instruments.

Williams, William (1737/38-1792), Boston; also made nautical instruments.

Witt, Christopher (fl. 1710-1765), Germantown, Pa.; also made clocks.

NAUTICAL

Bulmain & Dennies (fl. 1799), New York.

Clark, Robert (fl. 1785), Charleston, S.C.; also made surveying and optical instruments.

Condy, Benjamin (fl. 1756-92, d. 1798), Philadelphia; also made mathematical instruments.

Davenport, William (fl. 1800-1820), Philadelphia; also made mathematical and surveying instruments.

Dean, William (?-1797), Philadelphia; also made surveying instruments.

Doolittle, Enos (1751-1806), Hartford, Conn.; also made surveying instruments, directional compasses and clocks.

Emery, Samuel (1787-1882), Salem, Mass.

Fairman, Gideon (1774-1827), Newburyport, Mass.; also made mathematical instruments.

Ford, George, I (late 18th century to 1840), Lancaster, Pa.; also made surveying instruments.

Ford, George, II (fl. 1842), Lancaster, Pa.; also made surveying instruments.

Godfrey, Thomas (1704-1749), Philadelphia.

Gould, John (fl. 1794), Philadelphia; also made surveying and optical instruments.

Greenough, Thomas (1710-1785), Boston; also made mathematical and surveying instruments.

Hagger, William G. (c.1744-1830?), Newport, R.I.

Ham, James (fl. 1754-64), New York and Philadelphia; also made mathematical instruments.

Ham, James, Jr. (fl. 1780), Philadelphia; also made mathematical instruments.

Hamlin, William (1772-1869), Providence, R.I.; also made mathematical instruments.

Jayne, John (late 18th century), Salem, Mass.; also made mathematical instruments.

King & Hagger (1759/60 to early 1760's), Newport, R.I.; also made mathematical instruments.

King, Benjamin (1707-1786), Newport, R.I.; also made mathematical instruments.

King, Benjamin (1740-1804), Salem, Mass.

King, Daniel (1704-1790), Salem, Mass.; also made mathematical instruments.

King, Samuel (fl. 1786), Newport, R.I.; also made mathematical instruments.

Lamb, A., & Son (1780's), New York; also made mathematical instruments.

Lamb, Anthony (1703-1784), Virginia, Philadelphia, New York, and Hunter's Key, N.Y.; also made mathematical and surveying instruments.

Lamb, John (1735-1800), New York; also made surveying and mathematical instruments.

Newell, Andrew (1749-1798), Boston; also made mathematical instruments.

Pease, Paul (fl. 1750), probably Rhode Island.

Thaxter, Samuel (1769-1842), Boston; also made mathematical and surveying instruments.

Warren, Benjamin (fl. 1740-1790), Plymouth, Mass.; also made surveying instruments.

Williams, William (1737/38-1792), Boston; also made mathematical instruments.

OPTICAL

Benson, John (fl. 1793-1797).

Clark, Robert (fl. 1785), Charleston, S.C.; also made nautical and surveying instruments.

Sommer, Widow Balthaser (fl. 1753), New York.

Whitney, John (fl. 1801), Philadelphia; also made mathematical instruments.

Whitney, Thomas (fl. 1798-1821), Philadelphia; also made mathematical and surveying instruments.

SURGICAL

Bailey, John (fl. 1778), Fishkill, N.Y.; also made surveying instruments.

Fosbrook, W. (fl. 1786), New York; also made dental instruments.

Youle, James (1740-1786), New York.

Youle, John (fl. 1786), New York.

SURVEYING

Bailey, John (fl. 1778), Fishkill, N.Y.; also made surgical instruments.

Bailey, John, II (1752-1823), Hanover and Lynn, Mass.

Baldwin, Jedidiah (c. 1777-1829), Salem, Boston, and Northampton, Mass., and Hanover, N.H.

Biggs, Thomas (fl. 1792-1795), New York and Philadelphia.

Blakeslee, Ziba (1768-1834), Newtown, Conn.

Bowles, Thomas S. (c. 1765-1821?), Portsmouth, N.H.

Breed, Aaron (late 18th to mid-19th centuries), Boston.

Burnap, Daniel (1759-1838), East Windsor and Coventry, Conn.; also made clocks.

Chandlee, Benjamin, Jr. (1723-1791), Nottingham, Md.; also made clocks.

Chandlee & Bros. (fl. 1790-1791), Nottingham, Md.; also made clocks.

Chandlee, Ellis (1755-1816), Nottingham, Md.; also made clocks.

Chandlee, Ellis & Bros. (fl. 1791-1797), Nottingham, Md.; also made clocks.

Chandlee, Goldsmith (c.1746-1821), Winchester, Va.; also made clocks and sundials.

Chandlee, Isaac (1760-1813), Nottingham, Md.; also made clocks.

Clark, Robert (fl. 1785), Charleston, S.C.; also made nautical and optical instruments.

Clough, Jere (18th century), Boston.

Crow, George (fl. 1754-1772), Wilmington, Del.; also made clocks.

Davenport, William (fl. 1800-1820), Philadelphia; also made mathematical instruments.

Dean, William (?-1797), Philadelphia; also made nautical instruments.

Doolittle, Enos (1751-1806), Hartford, Conn.; also made nautical instruments and clocks.

Doolittle, Isaac, Jr. (1759-1821), New Haven, Conn.; also made clocks.

Dupee, John (after 1761), Boston.

Ellicott, Andrew (1754-1820), Baltimore; also made astronomical instruments.

Ford, George, I (late 18th century to 1840), Lancaster, Pa.; also made nautical instruments.

Ford, George, II (fl. 1842), Lancaster, Pa.; also made nautical instruments.

Gould, John (fl. 1794), Philadelphia; also made nautical and optical instruments.

Greenough, Thomas (1710-1785), Boston, also made nautical and mathematical instruments.

Greenough, William (fl. 1785), Boston.

Halsy, James, II (1695-1767), Boston; also made mathematical instruments.

Halsy, Joseph (fl. 1697-1762), Boston.

Hagger, Benjamin K. (c. 1769-1834), Boston and Baltimore; also made mathematical instruments.

Hanks, Benjamin (1755-1824), Mansfield and Litchfield, Conn.

Hanks, Truman (fl. 1808), Mansfield and Litchfield, Conn.

Harland, Thomas (1735-1807), Norwich, Conn.; also made clocks.

Heisely, Frederick A. (1759-1839), Frederick, Md., and Lancaster, Harrisburg, and Pittsburgh, Pa.; also made clocks and mathematical instruments.

Heisely, George (1789-1880), Harrisburg, Pa.; also made clocks and mathematical instruments.

Holcomb, Amasa (1785-1875), Southwick, Mass.; also made astronomical instruments.

Houghton, Rowland (c. 1678-1744), Boston.

Huntington, Gurdon (1763-1804), Windham, Conn., and Walpole, N.H.; also made clocks and other scientific instruments.

Jacks, James (fl. 1780's), Charleston, S.C.; also made mathematical instruments.

Kennard, John (1782-1861), Newmarket, N.H.; also made clocks.

Lamb, A., & Son (1780's), New York; also made mathematical and nautical instruments.

Lamb, Anthony (1703-1784), New York; also made mathematical and nautical instruments.

Lamb, John (1735-1800), New York; also made mathematical and nautical instruments.

Miller, Aaron (fl. 1748-1771), Elizabeth, N.J.; also made clocks and directional compasses.

Newell, Andrew (1749-1798), Boston; also made mathematical instruments and directional compasses.

Platt, Augustus (1809-1886), Columbus, Ohio; also made mathematical and surveying instruments.

Platt, Benjamin (1757-1833), Danbury, Litchfield, and New Milford, Conn.; Lanesboro, Mass.; and Columbus, Ohio; also made directional compasses and clocks.

Potter, John (fl. 1785), Brookfield, Mass.

Rittenhouse, Benjamin (1740-c. 1820), Philadelphia; also made astronomical instruments.

Rittenhouse, David (1732-1796), Philadelphia; also made astronomical instruments.

Rittenhouse & Evans (fl. 1770's), Philadelphia.

Stiles & Baldwin (fl. 1791), Northampton, Mass.

Stiles & Storrs (fl. 1792), Northampton, Mass.

Thacher, Charles, probably Boston.

Thaxter, Samuel (1769-1842), Boston; also made nautical and mathematical instruments.

Wall, George Jr. (fl. 1788), Bucks County, Pa.

Warren, Benjamin (fl. 1740-1790), Plymouth, Mass.; also made nautical instruments.

White, Peregrine (1747-1834), Woodstock, Conn.; also made clocks.

Whitney, Thomas (fl. 1798-1821), Philadelphia; also made mathematical and optical instruments.

Williams, William (1737/38-1792), Boston; also made nautical instruments.

                                                                                                                                                                                                                                                                                                           

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