Total Consumption
Total consumption of oil, tallow,
Description of number of of etc.,
motor. miles run. oil, tallow, per train mile
etc. run.
lb.
Electric 2,358.9 99.0 0.038
Rowan, steam 2,616.9 106.7 0.038
Krauss, steam 2,457.8 188.5 0.073
Wilkinson, steam 2,473.3 255.4 0.101
Compressed air 2,259.1 585.2 0.255
In addition to these considerations, it was thought useful to investigate
the quantity of water consumed in the case of those engines which used
steam. The experiments made on this point showed as the consumption of
water:
Gallons per mile.
Rowan 0.75
Compressed air 1.06
Wilkinson 5.89
Krauss 6.52
Thus, owing to the large proportion of water returned from the condenser
to the tanks, the Rowan actually used less water than the compressed air
engine.