The Moon Maid Author:Edgar Rice Burroughs I shall not bore you with dry, technical descriptions of our motors and equipment. Suffice it to say that the former were of three types--those which propelled the ship through the air and those which propelled it through ether, the latter of course represented our most important equipment, and consisted of powerful multiple-exhaust separators w... more »hich isolated the true Barsoomian Eighth Ray in great quantities, and, by exhausting it rapidly earthward, propelled the vessel toward Mars.« less