On the Construction of a Silvered Glass Telescope / Fifteen and a half inches in aperture, and its use in celestial photography

On the Construction of a Silvered Glass Telescope

SMITHSONIAN
CONTRIBUTIONS TO KNOWLEDGE.

VOL. XIV.

EVERY MAN IS A VALUABLE MEMBER OF SOCIETY, WHO, BY HIS OBSERVATIONS, RESEARCHES, AND EXPERIMENTS,
PROCURES KNOWLEDGE FOR MEN.
Smithson.

CITY OF WASHINGTON:
PUBLISHED BY THE SMITHSONIAN INSTITUTION.
MDCCCLXV.

ADVERTISEMENT.


This volume forms the fourteenth of a series, composed of original memoirs on different branches of knowledge, published at the expense, and under the direction, of the Smithsonian Institution. The publication of this series forms part of a general plan adopted for carrying into effect the benevolent intentions of James Smithson, Esq., of England. This gentleman left his property in trust to the United States of America, to found, at Washington, an institution which should bear his own name, and have for its objects the “increase and diffusion of knowledge among men.” This trust was accepted by the Government of the United States, and an Act of Congress was passed August 10, 1846, constituting the President and the other principal executive officers of the general government, the Chief Justice of the Supreme Court, the Mayor of Washington, and such other persons as they might elect honorary members, an establishment under the name of the “Smithsonian Institution for the increase and diffusion of knowledge among men.” The members and honorary members of this establishment are to hold stated and special meetings for the supervision of the affairs of the Institution, and for the advice and instruction of a Board of Regents, to whom the financial and other affairs are intrusted.

The Board of Regents consists of three members ex officio of the establishment, namely, the Vice-President of the United States, the Chief Justice of the Supreme Court, and the Mayor of Washington, together with twelve other members, three of whom are appointed by the Senate from its own body, three by the House of Representatives from its members, and six persons appointed by a joint resolution of both houses. To this Board is given the power of electing a Secretary and other officers, for conducting the active operations of the Institution.

To carry into effect the purposes of the testator, the plan of organization should evidently embrace two objects: one, the increase of knowledge by the addition of new truths to the existing stock; the other, the diffusion of knowledge, thus increased, among men. No restriction is made in favor of any kind of knowledge; and, hence, each branch is entitled to, and should receive, a share of attention.

The Act of Congress, establishing the Institution, directs, as a part of the plan of organization, the formation of a Library, a Museum, and a Gallery of Art, together with provisions for physical research and popular lectures, while it leaves to the Regents the power of adopting such other parts of an organization as they may deem best suited to promote the objects of the bequest.

After much deliberation, the Regents resolved to divide the annual income into two parts—one part to be devoted to the increase and diffusion of knowledge by means of original research and publications—the other part of the income to be applied in accordance with the requirements of the Act of Congress, to the gradual formation of a Library, a Museum, and a Gallery of Art.

The following are the details of the parts of the general plan of organization provisionally adopted at the meeting of the Regents, Dec. 8, 1847.

DETAILS OF THE FIRST PART OF THE PLAN.

I. To increase Knowledge.It is proposed to stimulate research, by offering rewards for original memoirs on all subjects of investigation.

1. The memoirs thus obtained, to be published in a series of volumes, in a quarto form, and entitled “Smithsonian Contributions to Knowledge.”

2. No memoir, on subjects of physical science, to be accepted for publication, which does not furnish a positive addition to human knowledge, resting on original research; and all unverified speculations to be rejected.

3. Each memoir presented to the Institution, to be submitted for examination to a commission of persons of reputation for learning in the branch to which the memoir pertains; and to be accepted for publication only in case the report of this commission is favorable.

4. The commission to be chosen by the officers of the Institution, and the name of the author, as far as practicable, concealed, unless a favorable decision be made.

5. The volumes of the memoirs to be exchanged for the Transactions of literary and scientific societies, and copies to be given to all the colleges, and principal libraries, in this country. One part of the remaining copies may be offered for sale; and the other carefully preserved, to form complete sets of the work, to supply the demand from new institutions.

6. An abstract, or popular account, of the contents of these memoirs to be given to the public, through the annual report of the Regents to Congress.

II. To increase Knowledge.It is also proposed to appropriate a portion of the income, annually, to special objects of research, under the direction of suitable persons.

1. The objects, and the amount appropriated, to be recommended by counsellors of the Institution.

2. Appropriations in different years to different objects; so that, in course of time, each branch of knowledge may receive a share.

3. The results obtained from these appropriations to be published, with the memoirs before mentioned, in the volumes of the Smithsonian Contributions to Knowledge.

4. Examples of objects for which appropriations may be made:—

(1.) System of extended meteorological observations for solving the problem of American storms.

(2.) Explorations in descriptive natural history, and geological, mathematical, and topographical surveys, to collect material for the formation of a Physical Atlas of the United States.

(3.) Solution of experimental problems, such as a new determination of the weight of the earth, of the velocity of electricity, and of light; chemical analyses of soils and plants; collection and publication of articles of science, accumulated in the offices of Government.

(4.) Institution of statistical inquiries with reference to physical, moral, and political subjects.

(5.) Historical researches, and accurate surveys of places celebrated in American history.

(6.) Ethnological researches, particularly with reference to the different races of men in North America; also explorations, and accurate surveys, of the mounds and other remains of the ancient people of our country.

I. To diffuse Knowledge.It is proposed to publish a series of reports, giving an account of the new discoveries in science, and of the changes made from year to year in all branches of knowledge not strictly professional.

1. Some of these reports may be published annually, others at longer intervals, as the income of the Institution or the changes in the branches of knowledge may indicate.

2. The reports are to be prepared by collaborators, eminent in the different branches of knowledge.

3. Each collaborator to be furnished with the journals and publications, domestic and foreign, necessary to the compilation of his report; to be paid a certain sum for his labors, and to be named on the title-page of the report.

4. The reports to be published in separate parts, so that persons interested in a particular branch, can procure the parts relating to it, without purchasing the whole.

5. These reports may be presented to Congress, for partial distribution, the remaining copies to be given to literary and scientific institutions, and sold to individuals for a moderate price.

The following are some of the subjects which may be embraced in the reports:—

I. PHYSICAL CLASS.

 1. Physics, including astronomy, natural philosophy, chemistry, and meteorology.

 2. Natural history, including botany, zoology, geology, &c.

 3. Agriculture.

 4. Application of science to arts.

II. MORAL AND POLITICAL CLASS.

 5. Ethnology, including particular history, comparative philology, antiquities, &c.

 6. Statistics and political economy.

 7. Mental and moral philosophy.

 8. A survey of the political events of the world; penal reform, &c.

III. LITERATURE AND THE FINE ARTS.

 9. Modern literature.

10. The fine arts, and their application to the useful arts.

11. Bibliography.

12. Obituary notices of distinguished individuals.

II. To diffuse Knowledge.It is proposed to publish occasionally separate treatises on subjects of general interest.

1. These treatises may occasionally consist of valuable memoirs translated from foreign languages, or of articles prepared under the direction of the Institution, or procured by offering premiums for the best exposition of a given subject.

2. The treatises to be submitted to a commission of competent judges, previous to their publication.

DETAILS OF THE SECOND PART OF THE PLAN OF ORGANIZATION.

This part contemplates the formation of a Library, a Museum, and a Gallery of Art.

1. To carry out the plan before described, a library will be required, consisting, 1st, of a complete collection of the transactions and proceedings of all the learned societies of the world; 2d, of the more important current periodical publications, and other works necessary in preparing the periodical reports.

2. The Institution should make special collections, particularly of objects to verify its own publications. Also a collection of instruments of research in all branches of experimental science.

3. With reference to the collection of books, other than those mentioned above, catalogues of all the different libraries in the United States should be procured, in order that the valuable books first purchased may be such as are not to be found elsewhere in the United States.

4. Also catalogues of memoirs, and of books in foreign libraries, and other materials, should be collected, for rendering the Institution a centre of bibliographical knowledge, whence the student may be directed to any work which he may require.

5. It is believed that the collections in natural history will increase by donation, as rapidly as the income of the Institution can make provision for their reception; and, therefore, it will seldom be necessary to purchase any article of this kind.

6. Attempts should be made to procure for the gallery of art, casts of the most celebrated articles of ancient and modern sculpture.

7. The arts may be encouraged by providing a room, free of expense, for the exhibition of the objects of the Art-Union, and other similar societies.

8. A small appropriation should annually be made for models of antiquity, such as those of the remains of ancient temples, &c.

9. The Secretary and his assistants, during the session of Congress, will be required to illustrate new discoveries in science, and to exhibit new objects of art; distinguished individuals should also be invited to give lectures on subjects of general interest.


In accordance with the rules adopted in the programme of organization, each memoir in this volume has been favorably reported on by a Commission appointed for its examination. It is however impossible, in most cases, to verify the statements of an author; and, therefore, neither the Commission nor the Institution can be responsible for more than the general character of a memoir.


The following rules have been adopted for the distribution of the quarto volumes of the Smithsonian Contributions:—

1. They are to be presented to all learned societies which publish Transactions, and give copies of these, in exchange, to the Institution.

2. Also, to all foreign libraries of the first class, provided they give in exchange their catalogues or other publications, or an equivalent from their duplicate volumes.

3. To all the colleges in actual operation in this country, provided they furnish, in return, meteorological observations, catalogues of their libraries and of their students, and all other publications issued by them relative to their organization and history.

4. To all States and Territories, provided there be given, in return, copies of all documents published under their authority.

5. To all incorporated public libraries in this county, not included in any of the foregoing classes, now containing more than 10,000 volumes; and to smaller libraries, where a whole State or large district would be otherwise unsupplied.


OFFICERS

OF THE

SMITHSONIAN INSTITUTION.

THE PRESIDENT OF THE UNITED STATES,
Ex-officio PRESIDING OFFICER OF THE INSTITUTION.
THE VICE-PRESIDENT OF THE UNITED STATES,
Ex officio SECOND PRESIDING OFFICER.
SALMON P. CHASE,
CHANCELLOR OF THE INSTITUTION.
JOSEPH HENRY,
SECRETARY OF THE INSTITUTION.
SPENCER F. BAIRD,
ASSISTANT SECRETARY.
W. W. SEATON, Treasurer.
ALEXANDER D. BACHE,      Executive Committee.
RICHARD WALLACH,
RICHARD DELAFIELD,

REGENTS.


—— —— Vice-President of the United States.
Salmon P. Chase, Chief Justice of the United States.
Richard Wallach, Mayor of the City of Washington.
Lyman Trumbull, Member of the Senate of the United States.
William P. Fessenden, "   "   "   "   "   "
Garrett Davis, "   "   "   "   "   "
Samuel S. Cox, Member of the House of Representatives U. S.
James W. Patterson, "   "   "   "   "     "
Henry W. Davis, "   "   "   "   "     "
William B. Astor, Citizen of New York.
Theodore D. Woolsey, "  of Connecticut.
Louis Agassiz, "  of Massachusetts.
(Vacancy.) —— ——
Alexander D. Bache, "  of Washington.
Richard Delafield, "  of Washington.

MEMBERS EX-OFFICIO OF THE INSTITUTION.


Andrew Johnson, President of the United States.
—— —— Vice-President of the United States.
William H. Seward, Secretary of State.
Hugh McCulloch, Secretary of the Treasury.
Edwin M. Stanton, Secretary of War.
Gideon Welles, Secretary of the Navy.
William Dennison, Postmaster-General.
James Speed, Attorney-General.
Salmon P. Chase, Chief Justice of the United States.
David P. Holloway, Commissioner of Patents.
Richard Wallach, Mayor of the City of Washington.

HONORARY MEMBER.


James Harlan.     The Secretary of the Interior.


TABLE OF CONTENTS.1

PAGE
ARTICLE I. Introduction. Pp. 16.
Advertisement iii
List of Officers of the Smithsonian Institution ix
ARTICLE II. Discussion of the Magnetic and Meteorological Observations made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845. Third Section, comprising Parts VII, VIII, AND IX. Vertical Force. Investigation of the Eleven (or Ten) Year Period and of the Disturbances of the Vertical Component of the Magnetic Force, and Appendix on the Magnetic Effect of the Aurora Borealis; with an Investigation of the Solar Diurnal Variation, and of the Annual Inequality of the Vertical Force; and of the Lunar Effect or the Vertical Force, the inclination, and Total Force. By A. D. Bache, LL. D., F. R. S., Mem. Corr. Acad. Sc. Paris; Prest. Nat. Acad. Sciences; Superintendent U. S. Coast Survey. Pp. 72. (Published May, 1864.)
ARTICLE III.   Discussion of the Magnetic and Meteorological Observations made at the Girard College Observatory, Philadelphia, in 1840, 1841, 1842, 1843, 1844, and 1845. Fourth Section, comprising Parts X, XI, AND XII. Dip and Total Force. Analysis of the Disturbances of the Dip and Total Force; Discussion of the Solar Diurnal Variation and Annual Inequality of the Dip and Total Force; and Discussion of the Absolute Dip, with the Final Values for Declination, Dip and Force between 1841 and 1845. By A. D. Bache, LL. D., F. R. S., Mem. Corr. Acad. Sc. Paris; Prest. Nat. Acad. Sciences; Superintendent U. S. Coast Survey. Pp. 44. (Published January, 1865.)
ARTICLE IV. On the Construction of a Silvered Glass Telescope, fifteen and a half inches in Aperture, and its Use in Celestial Photography. By Henry Draper, M. D., Professor of Natural Science in the University of New York. Pp. 60. (Published July, 1864.)
§1. Grinding and Polishing the Mirrors 2
§2. The Telescope Mounting 27
§3. The Clock Movement 38
§4. The Observatory 41
§5. The Photographic Laboratory 46
§6. The Photographic Enlarger 51
ARTICLE V. PalÆontology of the Upper Missouri: A Report upon Collections made principally by the Expeditions under command of Lieut. G. K. Warren, U. S. Top. Engrs., in 1855 and 1856. Invertebrates. By F. B. Meek and F. V. Hayden, M. D. Part I. Pp. 158, and five Plates. (Published April, 1865.)
Introductory Remarks vii
I.  Silurian Age. Potsdam Period 1
II.  Carboniferous Age. Carboniferous Period 11
III.  Carboniferous Age. Permian Period 48
IV.  Reptilian Age. Jurassic Period 66
Index 129
Explanations of Plates.
ARTICLE VI. Cretaceous Reptiles of the United States. By Joseph Leidy, M. D., Professor of Anatomy in the University of Pennsylvania, Curator of the Academy of Natural Sciences of Philadelphia. Pp. 140 and twenty plates. (Published May, 1865.)
Introduction 1
Sauria 5
Chelonia 104
A Synopsis, in which an attempt is made to define more closely the Genera and Species of Reptiles whose remains are described in the preceding pages 115
Index 121
References to the Plates 123

SMITHSONIAN CONTRIBUTIONS TO KNOWLEDGE.
180
ON THE CONSTRUCTION
OF A
SILVERED GLASS TELESCOPE,
FIFTEEN AND A HALF INCHES IN APERTURE,
AND
ITS USE IN CELESTIAL PHOTOGRAPHY.
BY
HENRY DRAPER, M. D.,
PROFESSOR OF NATURAL SCIENCE IN THE UNIVERSITY OF NEW YORK.
[ACCEPTED FOR PUBLICATION, JANUARY, 1864.]

COMMISSION

TO WHICH THIS PAPER HAS BEEN REFERRED.

Prof. Wolcott Gibbs.
Com. J. M. Gilliss, U. S. N.
Joseph Henry,
Secretary S. I.

COLLINS, PRINTER,
 PHILADELPHIA.


                                                                                                                                                                                                                                                                                                           

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