228 CATALOGUE. — THEORY OF HYDRAULICS, HYDRAULIC PRESSURE. 



Coulomb on the cohesion and resistance of 

 fluids. M. Inst. 111. Ph. M. VII. 183. 



Examined by the force of torsion. Pressure does not aug- 

 ment the friction ; on the contrary, the resistance is greater 

 when tile immersion is only partial. Greasing wood does 

 not lessen the friction. The friction of oil is 1 71 times as 

 great as that of water. A part of the friction is proportional 

 * to the velocity : the constant part is almost insensible. A 

 circle .195 metre in diameter, turning in water with a velo- 

 city of .14 m. in 1", meets a resistance equivalent to a 

 weight of 1 gramme acting on a lever of .143 m. The 

 portion proportional to the velocity is equivalent to .042 gr. 

 for a surface equal to twice such a circle moving in its own 

 direction with a velocity of .01 m. 



Ulloa. 



Juan Examen maritime. 

 Buat Hydraulique. 



Legendre's example of the solid of least re- 

 ^ sistance. A. P. 1786. 21. 



Tempelhoff on the motion of a projectile in 



a resisting medium. A. Berl. 1788. 2l6. 

 Michclolti on tlie impulse of the vein of a 



fluid. M. Tur. 1788. IV. App. 121. 



Produces some experiments not agreeing with the com- 

 mon theory. 



Loigna on the impulse of fluids. Soc. Ital. IV. 



418. 

 Saint Martin's ventilator acting by lateral 



friction Roz. XXXIII. l6l. 

 Hydraulic pressure. Langsdorfs hydraulik. 



pi. 5, 6. 

 Resistance of fluids. Langsdorfs hydraulik. 

 ' pi. 7, 8. 

 Zuliani on the impulse of a vein of a fluid. 



A. Pad. III. 337. 

 Zuliani sperimenti sopra Veffetto della caduta 



de' gravi nelle materie cedenti. 4. Pad. 



1798. R. S. 

 Vince on the motion and resistance of fluids. 



Ph. tr. 1795. 24. 



A machine for measuring the resistance of the air. 



Vince on the resistance of fluids. Ph. tr. 1798. 



1. Nich. in. 506. Papers on nav. arch. 11. 

 iii. 12. 



The resistance to a globe moving in water was J of the 

 resistance to a cylinder. The force acting in the direction 

 of a plane struck by a stream of water, varied considerably 

 according to the part of the plane impelled. 



Hutton's abstract of experiments on the re- 

 sistance of the air. Ed. tr. II. 29. Hutt. 

 Math. diet. II. 365. 



Gerstner's theory of the impulse of water. 

 Bohm. Abh.1795. II. 



PronyArch. Hydr. 



* Experiments of the society for the advance- 

 ment of naval architecture. 4. Lond. R. I. 



Avanzini on the resistance of fluids. A. Pad. 

 IV. 96. 



On bodies falling in serpentine lines. 

 Extract from Schober's experiments on the 



impulse of the air. Kunzes Schauplatz. I. 



312. 

 Trembieyon motion in resisting mediums. A. 



Berl. 1798. 60. 

 Eytelwein's experiments with the hydraulic 



quadrant. Samml. zur Baukunst. 1799- 

 Otto on the eficct of oil on waves. Zacb. 



Ephem. [I. 5l6. 111.242. 



Seems to depend on the friction of the air. 



Benzenberg's experiments on falling bodies. 

 Gilb. XII. .S67. XIV. 222. 



A body fell 144 feet Fr. in 1S6.95'", instead of 180.86'". 

 When the velocity exceeds loo feet in l", the resistance 

 increases faster than its square. Robins says 200. 



Benzenberg Versuche liber den gesetz des 



falles. Hamb. 

 Lacroix on the resistance of fluids. B. Soc. 



Phil. n. 69. 

 Robison's table of elevations and ranges. 



Enc. Br. Art. Projectiles. 

 Moreau on projectiles in resisting mediums. 



Journ. Polyt. IV. -xi. 204. 



Corda found the resistance of a sphere to that of a circle, 

 as 1 ; 2.45 in air, in water as i : S.5. Button found the 



