it is only desired to drive the tractor at 300 revolutionsper minute at full speed, a ratio of 5 to 1 drop is made;i.e., the spur wheel is five times the size of the drivingpinion. The motor is provided only with two speeds,one forward and one reverse. It is furthermore pro-vided with a free wheel… … EQUILATERAL HYPERBOLA SHOWING THE LAW 07 TBOTTINO IMPROVEMENT pump into action air is forced into the balloon toreplace the lost gas. The employment of this pumpdispenses with the necessity of placing a ballonettewithin the gas bag, which principle has been adoptedin some air vessels built on…
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