CATALOGUE. PHILOSOPHT AND ART3, PRACTICAL MECHANICS. 145 



Triangles. 



Triangle. Leup. Th. Ar. t. 18. 



Cramer's trigonometrical instrument. Leup. 



Th. A. t. 31. 

 Bouffer's trigonometrical instrument. A. P. 



1758. H. 101. 



Measurement of Angles in general, and con- 

 struction of Instruments. 



Hooice's dividing engine with a screw. Ani- 



niadv. on Heveiius. 

 Mayer on gonionietrical instruments. C. 



Gott. II. 3-25. 

 Passement's mode of dividing the quadrant. 



Mach. A. VJI. 341. 

 Due de Chaulnes on the dividing machine. 



A. P. 1765. H. 140. 

 Due de Chaulnes Art pour diviser les instru- 



mens de mathematique. A. P. Arts. f. 



Ace. A. P. 1768. H. 127. 

 Pattier's dividing tools. A. P. 1771, 

 *Ramsden's description of a dividing engine. 



Lond. R. S. 



Roz. I. 147. 

 Romain on the division of an angle. Roz. 



VIII. 55. 

 Rochon. A. P. 1777- H. 64. 

 Castilion on modes of division employed by 



Bird and by the D. de Chaulnes. A. Berl. 



1780. 310. 



Perez Trihchanon goniarithmetron. 4. Flor. 



1781. R. S. 



Perez sopra il suo stromento goniomctro tri- 

 plindice. 4. Bologna, 1786. R. S. 



Carangeot's goniometer. Roz. XXII. 193. 

 XXXI. 204. 



Hutton's proposal for a new division of the 

 quadrant. Ph. tr. 1784. 21. 



Into parts of the radius. 



Smeaton on the graduation of instruments. 

 Ph. tr. 1786. 1. 



Hindley's method was to drill equidistant holes in a brass 

 plate, and then to make a hoop of it. Smeaton recom- 

 mends to take from a scale the chord of 16^, and then to 

 bisect it continually. He thinks divisions can only be as- 

 certained to j^ of an inch, even by microscopes; and 

 proposes several indices to be employed at once. 



Ludlam on Bird's method of dividing. 4. 



Lond. 1786. U.S. 

 Hill's machine for measuring angles. S. A. 



VL 183. 

 A simple instrument for measuring height. 



Repert. III. 234. 

 Komarzewski on a subterraneous graphomc- 



ter. Par. 1803. R. S. Nich. 8. V. 283. 



Micrometer. 



Hooke's lectures. Anim. on Heveiius. 

 Lambert liber die Branderschen micrometer. 



12. Augsb. 1769. 

 Hunter's screw. Ph. tr. 1781. 58. 

 Enc. Br. Art. Micrometer. 

 Austin's mode of cutting fine screws. Ir. tr. 



IV. 145. Repert. 11. 399. 

 On the use of the screw. Nich. I. 158. 

 Hoi'nblower on the micrometer screw. Nich. 



VI. 247. 

 Huddart's station pointer. Nich. VII. 1. 

 See dso optical instruments. 



Theodolites, Quadrants, and Sextants. 

 See Practical Astronomy. 



Protractors, and Compasses for measuring 

 Angles. 



Calibers. Leup. Th. Suppl. t. 24. Enc. Br. 



Robertson Math, instr. 

 Mechanical trisection of an angle, by Ceva. 



1694. Leup. Th. Ar. p. I67. t. 27. 

 Duval. Mach. A. III. 113. 

 Carangeau's graphometer for crystals. Nich, 



8. I. 132. 



VOL. II. 



