 
| 0 | ||
| Ebony and brass mounted best sextants, from 4l. 4s. to | 8 | 18 | 6 |
| Metal ditto, all brass, framed on a principle the least liable to be warped or strained, with adjusting screws, telescopes, and other auxiliary apparatus, the most proper for taking distances accurately, to determine the longitude at sea, &c. | 12 | 12 | 0 |
| Ditto, second best | 8 | 8 | 0 |
| A new small 3-inch pocket box sextant to take angles to a minute, from 2l. 2s. to | 3 | 3 | 0 |
| Artificial horizons, by parallel glasses and quicksilver, to take double altitudes by | 1 | 16 | 0 |
| Gunter’s quadrant, from 4s. to | 1 | 1 | 0 |
| Azimuth compasses of different constructions, from 5l. 5s. to | 12 | 12 | 0 |
| Pocket compasses from 2s. 6d. to | 5 | 5 | 0 |
| Horizontal sun-dials, in brass, made for any latitude, of four, five, or six inches diameter, divided into five minutes of time, each at 6s. 9s. and | 0 | 12 | 0 |
| Ditto seven inches | 0 | 16 | 0 |
| Ditto eight inches, into two minutes | 1 | 4 | 0 |
| Ditto ten inches, ditto | 1 | 16 | 0 |
| Ditto twelve inches, ditto | 2 | 10 | 0 |
| Ditto, fifteen inches, into every minute, thirty-two points of the compass, &c. | 4 | 14 | 6 |
| Ditto eighteen inches, ditto, ditto, with equation table, &c. | 8 | 8 | 0 |
| Ditto 2 feet diameter, ditto, ditto | 15 | 15 | 0 |
| A new universal ditto and equatorial, making a very portable angular instrument, from 8l. 8s. to | 31 | 10 | 0 |
| Universal ring dials, from 7s. 6d. to | 10 | 10 | 0 |
| For a general description and representation of the instruments used in surveying, levelling, and other branches of practical geometry, see the late Mr. G. Adams’s Geometrical and Graphical Essays, an improved edition by W. Jones, in two vols, 8vo. 1797, with thirty-five folio copper-plates. Price 14s. | |||
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ASTRONOMICAL, &c. INSTRUMENTS. | |||
| A portable Transit Instrument, with a cast iron stand, to ascertain the rate of chronometers, the longitude, &c. the axis is twelve inches in length, and the telescope about twenty inches, packed in a case | 12 | 12 | 0 |
| Ditto, with a brass framed stand, and other additions | 20 | 0 | 0 |
| Transit instruments of larger dimensions made to order. | |||
| The new Circular Instruments and Equatorials, from 63l. to | 180 | 0 | 0 |
| Planetariums, shewing the phÆnomena of the Ptolemaic | 50 | 0 | 0 |
| Manual orreries of the common construction from 2l. 12s. 6d. to | 6 | 6 | 0 |
| Jones’s (Wm.) new portable orrery, the tellurian part | 1 | 1 | 0 |
| Ditto, the planetarium part | 1 | 1 | 0 |
| Tellurian and planetarium together, making the New Portable Orrery, packed in a neat mahogany box, according to the sizes, from 2l. 12s. 6d. to | 5 | 5 | 0 |
| An orrery shewing the motions of Mercury, Venus, the Earth and Moon, by wheel-work, the Earth is a 11?2 inch globe, packed in a box | 4 | 4 | 0 |
| Other planetariums and orreries in great variety, the motions by wheel-work, exemplifying all the motions and phÆnomena of all the planets, the Georgium Sidus included, from 40l. to | 1000 | 0 | 0 |
| Cometariums, for exemplifying the motion of comets, from 1l. 11s. 6d. to | 5 | 5 | 0 |
| Senex’s globes improved, twenty-eight inches diameter, mahogany frames, from 25l. to | 50 | 0 | 0 |
| Twelve inch ditto, improved by Ferguson, with all the new discoveries of Capt. Cooke, &c. with the new hour circles, which supersede all the intended advantages of cumbersome wires, and other appendages, in other globes, mounted in neat mahogany claw-feet frames | 5 | 5 | 0 |
| Ditto, in common coloured wood frames | 3 | 3 | 0 |
| Additional price of a compass, and fitting to both globes | 0 | 5 | 0 |
| A pair of red leather covers for the globes | 0 | 9 | 6 |
| Globes, nine inches diameter, with the new discoveries | 2 | 2 | 0 |
| Ditto, three inches ditto, in claw-feet, mahogany frames | 1 | 10 | 0 |
| Ditto, three inches single, one in a case for the pocket | 0 | 9 | 0 |
| Geographical planispheres, to solve problems, mounted as a hand fire-screen | 0 | 7 | 6 |
| A brass armillary sphere, three inches diameter | 3 | 3 | 0 |
| A six inch ditto | 6 | 6 | 0 |
| A nine inch ditto | 9 | 9 | 0 |
| Ditto as improved by Abbe Fontana, &c. | 2 | 4 | 0 |
| Gazometers by Priestley, Lavoisier, &c. from 1l. 1s. to | 5 | 5 | 0 |
| A blow-pipe, with various caps, for fluxing metals, &c. | 0 | 7 | 6 |
| Ditto, with silver spoon, megalascope, &c. | 1 | 1 | 0 |
| Ditto, ditto, with a variety of other necessary apparatus, packed in a fish-skin case, forming Cronstedt’s complete pocket laboratory, improved by Magellan | 2 | 12 | 6 |
| Magellan’s new portable lamp furnace, with the blow-pipe, small glass retorts, &c. &c. for chemical as well as mineralogical operations | 4 | 14 | 6 |
| Ditto, with the double bellows to apply to the blow-pipe | 7 | 7 | 0 |
| Double bellows, with deal table, and appendages, for glass blowing | 2 | 12 | 6 |
| A wooden tub for water, and another for quick-silver, with a selection of glass apparatus for performing the late discovered experiments on air | 6 | 6 | 0 |
| A box, containing all the useful precipitants of Bergman, &c. for analysing waters, and fluxes for the blow-pipe in phials with glass stoppers, with Gottling’s printed description of ditto | 4 | 8 | 0 |
| A mahogany case containing, in phials, a variety of preparations for young persons to perform amusive and instructive chemical experiments | 3 | 13 | 6 |
| Fumigating bellows for destroying insects in gardens, by tobacco, from 1l. 6s. to | 1 | 16 | 0 |
Instruments of Recreation and Amusement. | |||
| The sensitive fishes, that have the property of swimming to a piece of bread placed at the end of a stick; and, when the other end is presented, of retreating and going back, sensible, as it were, of no substance for them to eat | 0 | 6 | 6 |
| The sagacious swan, that with a machine makes three kinds | 1 | 18 | 0 |
| A box containing four numbers and four letters, the order of which may be discovered, if ever so secretly placed, by means of a curious magic perspective | 0 | 10 | 0 |
| Ditto with five numbers, no perspective, but another very similar box, made in neat mahogany boxes, and more difficult to discover the reason of | 1 | 18 | 0 |
| A curious magic oracle, unfolding answers to any proposed questions secretly taken out of a bag | 0 | 16 | 0 |
| A magic painter, exhibiting a copy of any one of eight different paintings secretly chosen | 0 | 10 | 6 |
| A communicative mirror, shewing portraits of any one of four secretly chosen; an elegant and curious instrument | 2 | 12 | 6 |
| A box containing five pieces of different metals, which may any way be secretly placed, and their situation be told by the magical perspective | 1 | 8 | 0 |
| An optical paradox, containing two perspectives, between which a board may be placed, and the object will be seen through them just as well as if the board was not there | 0 | 7 | 6 |
| Ditto mounted in mahogany, larger size | 1 | 8 | 0 |
| An optical deception, containing from six to twelve different paintings, and which are looked down upon through a perspective, and immediately there appears another very different object, without any alteration of the instrument whatsoever, or concern of the person using it, from 1l. 11s. 6d. to | 3 | 3 | 0 |
| A diagonal opera glass, that shews persons on one side, when the glass is presented to the object directly before you, from 6s. to | 0 | 15 | 0 |
| A multiplying glass, making one object appear a great number, from 1s. 6d. to | 0 | 10 | 6 |
| A set of anamorphoses or deformed pictures rectified by a polished cylinder | 2 | 2 | 0 |
| A mathematical recreation, containing near seventy figures on a card; any one figure being thought of, is readily pointed out by any one using it | 0 | 1 | 0 |
| The two curious mathematical cubes, one of which is gauged so as to prove it to be larger than the other, yet the larger one will actually pass through the smaller one, and not in any degree stretch it | 1 | 0 | 0 |
| The mathematical paradox, a piece of wood of one figure, fits exactly, and passes through a triangular, a square, and a circular hole | 0 | 2 | 6 |
| A double cone, that apparently rolls upwards up an inclined plane, though actually descending | 0 | 4 | 6 |
| A magic well, in which may be put four buckets full of different seeds, and fairly mixed together; any particular seed of the above four kinds may be drawn up separately, and, when examined, will be found to be | 1 | 11 | 6 |
| A mechanical instrument, consisting of a cube and two wooden handles, that supports itself on a point, although the entire form and weight appear evidently all on one side | 0 | 12 | 0 |
| A cylindrical mirror that produces two or three curious optical effects | 1 | 1 | 0 |
| A magic or electrical bottle, that is charged by the rubbing of a ribband only, and will give a shock to five or six persons, with apparatus, in a pocket case | 0 | 10 | 6 |
| A set of the artificial fireworks imitated, containing a series of brilliant and entertaining scenes of fireworks, cascades of fire, &c. producing altogether a pleasing effect, and not attende FINIS. London, Dec. 1, 1797 W. and S. Jones take this Opportunity of informing the Public that they have purchased the Stock and Copyright of the several Philosophical Essays by the late Mr. George Adams, of Fleet Street, and that they are now sold at their Shop in Holborn. The following are those now in print, and to be had as above. I. AN ESSAY ON ELECTRICITY, explaining clearly and fuly the principles of that useful Science, describing the various Instruments that have been contrived either to illustrate the Theory, or render the Practice of it entertaining. The different Modes in which the Electrical Fluid may be applied to the human Frame for medical Purposes, are distinctly and clearly pointed out, and the necessary Apparatus explained. To which is now added, A Letter to the Author, from Mr. John Birch, Surgeon, on the Subject of Medical Electricity. Fourth Edition, 8vo. Price 6s. illustrated with six Plates. II. AN ESSAY ON VISION, briefly explaining the Fabric of the Eye, and the Nature of Vision; intended for the Service of those whose Eyes are weak and impaired, enabling them to form an accurate Idea of the State of their Sight, the Means of preserving it, together with proper Rules for ascertaining when Spectacles are necessary, and how to choose them without injuring the Sight. 8vo. Boards, Price 3s. Second Edition. III. ASTRONOMICAL AND GEOGRAPHICAL ESSAYS, containing, 1. A full and comprehensive View, on a new Plan, of the general Principles of Astronomy, with a large Account of the Discoveries of Mr. Herschel. 2. the Use of the Celestial and Terrestrial Globes, exemplified in a greater Variety of Problems than are to be found in any other Work: they are arranged under distinct Heads, and interspersed with much curious but relative Information. 3. The Description and Use of small Orreries and Planetaria, &c. 4. An Introduction to Practical Astronomy, by a Set of easy and entertaining Problems. Third Edition, 8vo. Price 10s. 6d. in Boards, illustrated with sixteen Plates. IV. AN INTRODUCTION TO PRACTICAL ASTRONOMY, or the Use of the Quadrant and Equatorial, being extracted from the preceding Work. Sewed, with two Plates, 2s. 6d. V. GEOMETRICAL AND GRAPHICAL ESSAYS. This Work contains, 1. A select Set of Geometrical Problems, many of which are new, and to be found in no other Work. 2. The Description and Use of those Mathematical Instruments that are usually put into a Case of Drawing Instruments. Besides these, there are also described several New and Useful Instruments for Geometrical Purposes. 3. A complete and concise System of Surveying, with an Account of some very essential Improvements in that useful Art. To which is added, a Description of the most improved Theodolites, VI. AN APPENDIX to the GEOMETRICAL AND GRAPHICAL ESSAYS, containing the following Table by Mr. John Gale, viz. a Table of the Northings, Southings, Eastings, and Westings to every Degree and fifteenth Minute of the Quadrant, Radius from 1 to 100, with all the intermediate Numbers, computed to three Places of Decimals. Price 2s. Just Published In Quarto, with thirty-four folio Plates, separate. The Second Edition, with many FREDERICK KANMACHER, Price 1l. 8s. in Boards. Also in the Press, In Five Volumes 8vo. The Second Edition, with upwards of Forty large Plates, considerable Alterations and Improvements; containing more complete Explanations of the Instruments, Machines, &c. and the Description of many others not inserted in the former Edition. By W. JONES, | |||
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