. Geometrical and graphical essays, containing a general description of the mathematical instruments used in geometry, civil and military surveying, levelling, and perspective; with many new practical problems. al ditto 1 11 6 PLAlE XIX. Fjg. 1. Hadleys quadrant, ebony and brass, 31. to ..., 3 13 6 ——4. Best metal sextant, 8 to 10 inches radius .. ,,. 13 2 6 Bass stand and counteipoise for a ditto 4 4 0 Second best sextants, 8l. 8s. to 10 10 0 11. Pocket box sextant from 2l. 2s. to 3 3 O 12. Artificial horizon ll. l6s. and complete 2 2 0 PLATE 2. Feather edged 12 inch box plotting sc
. Geometrical and graphical essays, containing a general description of the mathematical instruments used in geometry, civil and military surveying, levelling, and perspective; with many new practical problems. al ditto 1 11 6 PLAlE XIX. Fjg. 1. Hadleys quadrant, ebony and brass, 31. to ..., 3 13 6 ——4. Best metal sextant, 8 to 10 inches radius .. ,,. 13 2 6 Bass stand and counteipoise for a ditto 4 4 0 Second best sextants, 8l. 8s. to 10 10 0 11. Pocket box sextant from 2l. 2s. to 3 3 O 12. Artificial horizon ll. l6s. and complete 2 2 0 PLATE 2. Feather edged 12 inch box plotting scales, each ..030 Ditto ivory, each 0 8 O PLATE XXX L Fg. ]g. Pantagraph, 2 feet, best 4 14 6 Common ditto, 12 to IS inches, from ll. 4s. to 3 20. T. Squares, from 6s. ()d. to 0 PLATE XXXIT. Fig. I. Perspective machine G 2. Ditto, ditto 5 3. Perspective compass 1 IS PLATE ^. 2, 3, 4, and 5. Keiths improved parallel scales in a case . 0 10 G Ditto in wood and ivorj-^, or all ivory 1 5 0 6 and 7, Gunners callipers, from 2l. 12s. 6d. to . G 6 0 8. Gunners quadrant 2 12 6 . Q. level and perpendicular 1 l6 0 For farther particulars see W. and S. Jokess general catalogue. 13 6 10 6 6 0 5 0 IS 0.
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