]46" CATALOGUE. PHILOSOPHY AXD ARTS, PRACTICAL MECHANICS. 



Angular surveying. 

 See Figure of the Earth. 



I'othinot on determining the position of a 



place concealed from view. A. ^. X. 



150. 

 Beighton's new plotting table. Ph. tr. 1741. 



XLI. 747. 

 On the height of the ascent of rockets. Ro- 

 bins. Ph. tr. 1749. XLVI. 131. Ellicott. 



Ph.tr. 1750. XLVI. 578. 

 Gensanne's machine for measaring small 



distances from a single station. Mach. A. 



VII. 111. 

 Langlois's machine for fixing instruments. 



A. P. 1751. H. 174. 

 Michel! on the use of Hadley's quadrant in 



surveying. Ph. tr. 1765. 70. 

 Enc. Br. Ar. Circumferentor. 

 Meister on Meyer's scale for reducing angles 



to the horizon. Commentat. Gott. 1785. 



VIII. 75. 



The white lights were found the best object by night. 

 Ph. tr. 1790. 



Levels. 

 See Astronomical Instruments. 



Mathematical Machines. 

 Hooke in Birch III. 85. 

 Leibnitz's arithmetical machine. M.Berl. I. 



317. 

 Napier's reckoning rods. Leup. Th. Ar. t. 



4.5. 

 Biler's logarithmic circle. 1696. Leup. Th. 



Ar. t. 13. 

 Reckoning machines. Leup. Th. Ar. t. 6.-9. 

 Perrault's rhabdological abacus. Mach. A. I. 



55. 

 Lepini's arithmetical machine. A. P. 1725. 



H. 103. Mach. A. IV. 131. 

 Pascal's machine. Macl). A. IV. 137. E. M. 



Pi. VII. Algebre 2. 



Clairaut's tiigonoraetrical instrument. Mach. 

 A. V. 3. 



Clairaut's circular instrument. A. P. 1727. 

 H. 142. Nich. V. 40. 



Hillerin de Boissandeay's arithmetical ma- 

 chine. A. P. 1730. H. 116. Mach. A. V. 

 103. 



Mean's arithmetical tarif. Mach. A. V. 165. 



Gersten's arithmetical machine. Ph. tr. 1735. 

 XXXIX. 79. Fig. 



Smethurst's shwanpan, or account table. Ph. 

 tr. 1749. XLVI. 22. 



Robertson on Gunter's scale. Ph. tr. 1753. 96. 



Description, of Robertson's improved Gun- 

 ter's scale. R. S. 



Rowning's machine for finding the roots of 

 equations. R. S. 

 Described Ph. tr. 1770. 240. 



Nicholson's logistic circle and scales. Ph. tr. 

 1787. 246. Nich V. 



Lorgna Fabrica delle squadre. 4. R. S. 



Pearson on Gunter's scale. Nich. I. 45. 



Measures. 



Modes of obtaining a Standard. 



Condamine on an invariable measure. A. P. 



1747.439. H. 83. 

 Blaket/ on a universal measure. 8. R. S. 

 Rosier XV. 59. 

 Hatton's machine for finding a standard. S. 



A. I. 238. 

 If hitehurst's attempt to obtain measures of 



length from the measurement of time, 4. 



London, 1787. 



Fordyce bought his apparatus : when well fixed it kept 

 time very accurately. Ph. tr. 1794. 2. 



Wkitehurst on pendulums. 1792. R. 1. 

 Boscovich on finding the length of the pen- 

 dulum. Op. ined. V. 179. 

 Report on the choice of a unit of measures. 



