BUaehh^ Pi oeefu'^Laieral Mot'tou of Fluids. 273 



turn the fame way, and with the fame /peed, the fkains could not pofllbly entangle eacli 

 other. 



In order to (hew the uferjlnefs of this apparatus ftill more clearly, I requeft the fociety 

 to attend to the following ftatement of the expencc of a given quantity of bleaching liquor, 

 with and without alkali, but of equal ftrength. 



TVith ktHLAhi*. jT. s. d. 



8olb. of fait, at I'd. per lb. — — — o 10 o 



60 lb. of oil of vitriol, at 6'd. per lb. — — __ i 12 6 



30 lb. of manganefe — — — — — 026 



20 lb. of pearl-afhes, at 6d. per lb. — — — — . o 10 o. 



■J. 



But It appears by the foregoing experiments, that the liquor lofes ftrength 



by an addition of alkali. The value of this lofs, vi'hich on an average amounts 



to 15 per cent, mud be added to the expence — — — 



IS 



Without Alkali. 



80 lb. of fait — — — _— _ 6 10 



60 lb. of oil of vitriol -— — — — ^^ i 12 6 



36 lb. of manganefe — — — — 026 



3 3 3 

 o 



£'^ 5 



It appears from this calculation, that a certain quantity of the liquor for the ufe of any 

 apparatus cofts only 2/. 5J. ; but, that the fame quantity of the alkaline liquor cofts 

 3 /. 3 X. 3 </. which is 40 per cent, more than the other. The aggregate of fo confiderable a 

 living muft form a large fum in the extenfive manufactures of this country. 



VIII. 



Experimental Refearches concerning the Principle of the lateral Communication of Motion in Fluids 

 applied to the Explanation of various Hydraulic Phenomena. By Citizen f. B. FsNTVRif 

 Profejfor of Experimental Philofophy at Modena, Member of the Italian Society of the In/iitutt 

 tf Bologna, the Agrarian Society of Turin, (jfc. 



(Continued from Page 179 of the prefent Volume.) 



IPropofttion V. 

 N an additional conical tube, the preflure of the atmofphere increafes the expenditure lit 

 the proportion of the exterior feftion of the tube to the fe(3ion of the contrafted vein, what- 

 ever may be the pofition of the tube, provided its internal figure be adapted throughout to 

 the lateral communication of motion. 

 We have feen (Propofition III.) that the preflure of the atmofphere increafes the expen* 



• I make no mention of the expenCe attending the preparation of the liquor, it being the fame in both 

 eafet. J 



Yofc. IL—Sept. 1798. Nn diture 



