192 
V. The current is now reduced by the velocity to ’495. 
1. Heat evolved per hour by the wire, 63 -88 x 
units. 
2. Consumption of zinc per hour, 309 x = about 190 grains. 
3. Heat due to 309 grains = 39 - 28 units. 
4. Work per hour (39-28 - 24-34)772 = 11,533 ft. lbs. 
FOURTH EXPERIMENT. 
VI. The current was now reduced to -3934. 
1. Heat evolved by the wire, 63-88 x ' = 15*25 units. 
2. Consumption of zinc per hour, 309 x ~ ?|= 151 grains. 
3. Heat due to zinc = 31 -21 units. 
4. Work per hour (31-21 - 15-25)772 = 1T232 ft. lbs. 
FIFTH EXPERIMENT. 
VII. When the engine was at rest the current was 1-211 
1. Heat evolved per hour by wire, 96-07 units. 
2. Consumption of zinc per hour, 465 5. 
3. Work, 0. 
VIII. Current reduced to -757. 
1. Heat evolved by the wire, 96-07 x J 2 = 37"6. 
2. Consumption of zinc per hour = 291 grains. 
3. Heat due to 291 grains = 60-16. 
4. Work per hour (60-16 - 37-6) x 772 = 17,416 ft. lbs. 
SIXTH EXPERIMENT. 
IX. When the engine was at rest, current 1 182. 
1. Heat evolved per hour by the wire, 94-15 units. 
2. Consumption of zinc per hour, 453-4 grains, 
3. Heat due to 453-4 grains, 94-15. 
4. Work, 0. 
X. When the current was reduced to -58. 
1. Heat evolved by the wire, 94-15 x / =22-74. 
2. Consumption of zinc per hour = 223 grains. 
3. Heat due to 223 grains = 46-103 units. 
4. Work per hour should be (46T03 - 22-74)772 - 18,033 ft. lbs. 
'***)• = 24-34 
• 806 / 
