1$ APPARATUS FOR RAISING WATER. 



The condenfed air, however, could any time be let out, 

 by a fmall pipe which was placed within the bottle, and 

 opened on the outfide of the vefTel C. 



The pipe A B had a joint above the bottom of the cittern, 

 to facilitate the trial of mouth-pieces of various forms, to find 

 by which the apparatus would lip the mod air : and it appeared 

 that no form, or pofition, conduced more to this efFecl, than 

 when the pipe was crooked at lop to receive the water in a 

 horizontal current, and the higher fide of its orifice was not 

 more than two lines below the furface of the water in the cif- 

 tern. It alfo appeared, that no lefs quantity of air was col- 

 lected, when the diameter of the orifice of emiffion was re- 

 duced to four lines, than when it was half an inch. 

 Experiments to After feveral experiments to determine the quantity of 

 ihew how much water requifite to fupply the expenditure from the cittern, and 

 ried down with keep the furface of the fluid accurately at the height beft 

 he water. adapted to the operation of the apparatus ; feveral trials were 

 made to afcertain the quantity of air a given quantity of water 

 would convey into the bottle in a given time. The remits of 

 feveral trials on the 2lft of May 1S03, were as follow : 



J. The fall being 50 inches, and the orifice of emiffion four 

 lines in diameter, the inverted bottle above C, holding ten 

 ounce meafures of water, was filled with air, under the pref- 

 fure of a column 18 feet high, by 14 pints of water flowing 

 out at the orifice of emiflion at E, in 143 feconds. 2. By 13 

 pints, in 133 feconds. 3. By 12f pints, in 125 feconds. 

 By 12 pints. 5. By 1 1 pits, in 95 feconds. 6. By 14 pints, 

 in 114 feconds. 7. By 12 pints, in 102 feconds. 8. By 12 

 pints, in 10S feconds. 



9. The orifice of emiffion being half an inch in diameter, 

 the bottle was filled by 12 pints. 10. By 13 pints, in 133 

 feconds. 1 1. By 12| pints. 



12, 13. The fall being 44 inches, the orifice of emiffion four 

 lines in diameter, 1 1 pints filled the bottle in 95 feconds ; and 

 14 pints, in 120 feconds. 

 With an height The difference in the time, and the quantity of effluent 



of 18 feet and t required to fill the bottle with air, in thefe trials, was 



fall 50 inches, ^ . r . 



oo parts of water probably occafioned by a portion of the air being fometimes 



earned down contained in the higher, and at other times in the lower part 



•ne of condenfed , - * « 1 /* 1 /*• r 



jir. ol the pipe A B, at the commencement or the errunon : or, 



perhaps, 



