CATALOGUE. — HYDRAULIC INSTRUMENTS AND MACHINES. 



245 



Marine Quadrants. 



E. M. PI. V. Marine. PI. 106. 



Enc. Br. Art. Quadrant. 



See astronomical instruments. 



HYDRAULIC INSTRUMENTS AND MACHINES, 

 FOR PRODUCING MOTION IN FLUIDS. 



Regulations of Discharge. 



*Hero. 



Hero's clepsydra was a siphon supported by a float and 

 bent over the side of the vessel. 

 Boyle's lamp. Hooke. Ph. Coll. n, 2. p. 33. 



Kept full by a supply from an inverted reservoir at a 

 distance. 



A lamp by Hooke. Birch. II. 1.55. 



The second of his Lampas. 

 Hooke's lampas. 4. Lond. 1677. Lect. Cutl. 



Proposes a variety of methods for keeping a lamp full. 

 1. A moveable vessel with a partition, of half the specific 

 gravity of oil, balanced so that the surface of the o'l in one 

 of the compartments is always at the same heigh . 2. A 

 semicytindrical or hemispherical counterpoise of half the 

 specific gravity of oil, moveable on its axis. 3. A float on a 

 hinge at the edge of a moveable vessel. 4. A simple float 

 within a glass vessel. 5. A float supporting a lamp at a 

 distance. 6. 7. A counterpoise acting on a spiral fusee. 8. A 

 vessel with oil suspended by a counterpoise below a fixed 

 ■plug which fits it. 



Observes, that an equable discharge from an orifice may 

 be thus produced, and employed for the measurement of 

 time by the graduation of the counterpoise : and that two 

 such cavities may be made to discharge their fluids into each 

 other, and to be alternately raised and depressed by the pre- 

 ponderance. 

 A lamp kept full by water dropping into a 



branch of the vessel. Ph. tr. I698. XX. 



378. 

 Varignon's mode of making clepsydra*. A. P. 



1699- 51. H. 99. 

 Bernoulli on clepsydras, or hourglasses. A. P. 



Pr. I. iv. 

 Perronnier's float regulator. Mach. A. VII. 



335. 



Supporting a cone or conoid, which passes through the 

 orifice, and regulates its magnitude. 



Preigney's oil candle, or lamp of Amiens, 

 with a pump. Mach. A. VII. 395. 



Keir's hydrostatic lamp. Repert. VIII. 289. 

 Nich. III. 467. Gilb. VI. 96. 



Edelcrantz's statical lamp. Nich. 8. V. 93. 



Steevens on equalising the discharge of fluids. 

 Ph. M. XX. 289. 



See sources of light. 



Pipes and Simple Fountains. 



The ancients did not use leaden pipes, because they 

 thought them unwholesome. Palladius Mens. August. 



Vitruvius. 



Papin's siphon always full. Birch. IV. 350. 



Papin found that a siphon stopped after a quarter of an 

 hour, from the extrication of air. Birch. IV, 400. 



Mariotte on the resistance of waterpipes. 



A. P. I. 69. 

 Cassini on the waters and fountains at Mo- 



dena. A. P. I. 93. 

 Mariotte on the supply of fountains, and on 



the resistance of pipes. A. P. I. 170, 225. 

 Observation on conduits. A. P. I. 284. 

 Lahire on springs and cisterns. A. P. 1703. 



56. H. 1. 

 Leupold Th. hydrotechn. 

 Desaguliers on the running of water in pipes. 



Ph. tr. 1726. 77. 



Found the discharge of a long pipe only ^ of the full 

 quantity, and attributed the diHerence to air in the pipe. 

 This may have had some little effect, but Buat's simplest 

 rule gives only -^ in the case of the experiment. 



Pitot on the distribution of water. A. P. 1735. 



244. H. 70, 

 Waterpipes and fountains. Belidor Arch. 



Hydr. II. i. 265. pi. n. 54, 55. 

 Deparcieux on conduits. A. P. 1750. 39. H. 



153. 



