Under head No. 15 the tractive power of all the motors was sufficient during the trials, but the line was practically level, therefore this question could only be resolved theoretically, so far as these trials were concerned, and the table before given affords all the necessary data for the theoretical calculation. As regards the rapidity with which the motors could be brought into use from standing empty in the shed, the electric car could receive its accumulators more rapidly than could the boiler for heating the exhaust of the compressed-air car be brought into use. 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-- In 40 minutes 8 atmospheres. 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. TABLE II. 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 TABLE III.