. Machinery and processes of the industrial arts, and apparatus of the exact sciences. n the other hand, supposing that the prime mover is of the forceof two hundred horse-power, and that it is required to know what is theextreme distance at which this motor can deliver a force of one hundred,he linds that this maximum distance would be only 1,545 metres, orless than a mile, (a mile being 1,608 metres.) The comparison between the two modes of transmission leaves, ofcourse, no place at all to the second. But a comparison so presented isa tacit assumption that in the practical solution of this i
. Machinery and processes of the industrial arts, and apparatus of the exact sciences. n the other hand, supposing that the prime mover is of the forceof two hundred horse-power, and that it is required to know what is theextreme distance at which this motor can deliver a force of one hundred,he linds that this maximum distance would be only 1,545 metres, orless than a mile, (a mile being 1,608 metres.) The comparison between the two modes of transmission leaves, ofcourse, no place at all to the second. But a comparison so presented isa tacit assumption that in the practical solution of this important mechan-ical problem there is no other choice but between the two modes of trans-mission contrasted. Whether or not this assumption is wholly legiti-mate we shall presently impure. A different solution of the problemis in fact presented in the Exposition itself, and this will now be con-sidered. CALLESS HYDRO-AERO-DYNA3IIC WHEEL. Another mode of transmitting power to great distances, proposed byan exposant from Belgium, Mr. A. Calles, deserves consideration, if not Fig. Calless Hydro-Aero-Dynamie Wheel. CALLESS HYDRO-AERO-DYNAMIC WHEEL. 135 for what it is, at least for what it suggests. The plan of Mr. Calles is tomake use of air under a certain degree of compression as the vehicle ofthe force to be transmitted, not by accumulating the air thus employedin reservoirs, but by driving it, by the operation of the original motor,directly into a tube extending to the point of final application, where itis to be discharged beneath a wheel submerged in water, which it is toturn by its ascensional force. The mode of application is illustrated inFig. 39. The idea of employing compressed air as a means of transmitting poAveris not new 5 but the mode here suggested of using the power so trans-mitted is sufficiently original. The exhibitor claims originality in anotherpoint of view. His application of the power is not only original in formbut in principle also. At Mont Cenis, w
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