As regards the steam motors, the following were the results from the time of lighting the fires:
The Rowan-- In 34 minutes 3 atmospheres. " 36 " 4 "
At this pressure the vehicle could move--
The Wilkinson-- In 35 minutes 2 atmospheres. " 40 " 4 " " 44 " 6 " " 47 " 8 "
The Krauss machine required two hours to give 6 atmospheres, which was the lowest pressure at which it could be worked.
The results under No. 17, viz., the fewest interruptions to the daily service, class the motors in the following order: Krauss, electric, Rowan, Wilkinson, compressed air. The chief cause of injury to the compressed air motor arose from the carelessness of the drivers, who allowed the steam boiler to be burnt out. Unfortunately, these drivers were new to the work.
Under the letter C are classed considerations of economy in the consumption of materials used for generating the power necessary for working.
19. Minimum consumption of fuel (either coke or coal), in proportion to the number of kilometers run, and to the number of places, assuming for the seats a width of at least sixteen inches for each person seated.
It must be borne in mind that the conditions of the competition required that a second car should be periodically drawn by the motor, and that the calculations which follow include the total number of miles run, the total amount of fuel, etc., consumed, and the total number of passengers which could be conveyed by each motor, during the total time that the experiments were being carried on.
Total Description of motor. number of Total No. of lb. train miles Consumption per run. of fuel. train mile.
lb. Electric. 2,358.9 14 786 6.16 Rowan. 2,616.9 14,498 5.42 Wilkinson. 2,473.3 22,000 8.82 Krauss. 2,457.8 22,726 9.10 Compressed air. 2,259.1 90,420 39.48
No. of places No. of lb. of Description of motor. indicated on fuel consumed the cars, per Consumption per places mile run. of fuel. indicated per mile run. lb. Electric 80,203.5 14,786 0.18 Rowan 148,399.6 14,498 0.09 Wilkinson 119,085.1 22,000 0.18 Krauss 108,983.9 22,726 0.20 Compressed air 128,189.3 90,420 0.69
Description of motor. No. of seats per No, of lb. of mile run. Consumption fuel consumed of fuel. per seat per mile run. lb. Electric 61,591.2 14,786 0.23 Rowan 135,928.8 14,498 0.10 Wilkinson 93,965.6 22,000 0.23 Krauss 86,039.9 22,726 0.25 Compressed air 132,732.7 90,420 0.66
