CATALOGUE. — HYDROSTATIC INSTRUMENTS. 



231 



HYDKOSTATIC INSIRUMENTS. 



Levels. 



See Geometrical Instruments, and Astrono- 

 mical Instruments. 

 DeteTmination of Specific Gravities. 



Boyle's works. Ed. 1772. IV. 204. 

 Homberg on the difference of weight in the 



air and in a vacuum. A. P. X. £57. 

 Jurin on weighing bodies. Ph. tr. 1721. 



XXXI. 223. 



Observes, that wood becomes heavier than water, when 

 the air is extricated from it. 



Fahrenheit on specific gravities. Ph. tr. 1724. 



XXXIII. 114. 

 Dalibard on the weight of bodies in different 



liquids. S. E. I. 212. 

 Baume Elemens de pharmacie. 

 Baume's hydrometer. Avantcoureyr. 1768, 9. 



Nich. L37. 

 Ramsdenon the specific gravities of fluids. 4. 



Lond. 1792. Roz. XL. 432. Ann. Ch. 



XIII. 243. 

 Schmeisser's instrument for determining 



specific gravities. Ph. tr. 1793. l6o. 

 Robison. Enc. Br. Art. Specific Gravity, 

 Prony Architecture hydraulique. § 6l4. 

 Say's instrument for measuring volumes. 



Ann. Ch. XXIH. 1. 

 Ilassenfratz and Schmidt on specific gravi- 

 ties. Ann. Ch. XXXIX. 193. 



H. prefers weighing in a bottle to a hydrometer. 



^;A7«s on specific gravities. 4. Lond. 1803. 

 R.L 

 Extr Ph. M. XV. 277. 



Leslie measures the specific gravity of gases by the velo- 

 city with which they are' discharged. Lesl. on heat. 



Hydrometers. 



Boyle's hydrometer for solids. Ph. tr. I675. 

 X. 329. 



Monconi's hydrometer. Birch. I. 257. 

 Hooke's waterpoise for liquids. Ph. tr. 1693. 



XVII. 63. 

 Hooke's hydrometer. Birch. III. 344, 348, 



364. 



A bulb nearly of the vyeight of water. 

 Romberg's areometer. A. P. 1699. 46. 

 Fahrenheit areometri destriptio. Ph. tr. 



1724. XXXIII. 140. 



With a cup on the stem for weights. 



Leupold Th. hydrostaticum. Th. hydro- 

 tech n. 

 Desaguliers on Clarke's hydrometer. Ph. tr. 



1730. XXXVI. 277. 

 Clarke substituted copper for glass, and screwed on 

 weights at the bottom of the instrument. 



Gfsncr de hydroscopio. Zurich, 1754. 

 Gesner \on den hydroscopen. Vien. 1771. 

 Montigny on comparative areometers. A. P. 



1768. 435. 

 Le Roy on comparable areometers. A. P. 



1770. 5'26. 

 De Luc's comparable areometer. Ph.tr. 1778. 



509. 

 Casboison the areometer. Roz. XV. 228. 

 E. M. A. VI. Art. Pese-liqueurs. 

 E. M. Physique. Art. Areometre. 

 On the oenometer. Roz. XXII. 89. XXIIL 

 . 55. 

 Nicholson's hydrometer. Manch. M. 11.370.- 



Boyle's hydrometer was chiefly for guineas. Clarke's 

 had weights that were screwed on below. Quin's had a 

 conical stem, making the degrees more equal. Nicholson's 

 has a dish below, as well as above, and may be employed 

 for examining solids. 



Weigel de historia barylliorum. 4. Greifsw. 



1785. 

 Brisson's areometer, requiring no calculation. 



A. P. 1788.582. 

 Vullet on areometers. Roz. XXXIII 241. 

 On the hydrometer. Ph. tr. I790 .'^42. 

 Quin's hydrometer. S. A. VIII (98. 



