422 R. H. Richards—Jet Aspirator for Laboratories. 
Calculated results. 
With vacuum. With no vacuum. 
Water P. Air tension. Water P, Air tension. 
2378 73830" 1639™™ 0 
2285 Tat 157 0 
2176 726 1508 0 
ASPIRATOR No. 6 a*:w? 5 +1, 
a= 090" Barometer, 762°" 
w— 040 75° F 
o == 70 Water, 72° F 
Record of experiments. 
G,. Gp. 
1732™™ 471 
—hA, G,: H. h. H—A. 
0 734 A471 415 415 0 
1782 600" 730" 74 791§ =  490F 3 0 
500t 
Caleulated results. 
With vacuum. With no vacuum. 
Water P. Air tension, Water P. Air tension. 
2T74= 7g4nm 303955 0 
2609 7314 1931 0 
ASPIRATOR No. 7. a? : w*=15:1. 
a= 246" Barometer, 764™™ 
w= *0635 Air, 7 
oO = "254 Water, fe 
Record of experiments. 
G. Ge. EH Ah «609A. 
1748 462 495 820 175 Air and water exactly bal- 
anced each other. 
neequeneuse results, 
2301 : Air tension. 
Comparison of the amount of water column pressure 
re- 
quired by aspirators of different = in order that they may 
produce an approximate vacuum 
Taste IIL. 
Water pressure. Air tension. Ratio of sae 
1448™™ 7414" 
743 
