FLYING-MACHINE WORK. 175 
nothing further is needed but attention to the chronograph and 
indicator. 
Plate x11. shows a three cylinder engine designed to rotate two 
wings through 360° of arc in exactly the same time without the 
interposition of bevel gearing. From the drawing it will be seen 
that the cylinders are attached to one wing and the crank shaft 
to the other ; the cylinders are free to rotate in the opposite direc- 
tion to the crank-pin. Uniformity of motion is got by two eccen- 
trics, one on the cylinder face and one on the valve. The two 
eccentrics are between one pair of guides. Should one eccentric 
try to go faster than the other, owing to the difference of the 
frictions of the two sets of moving parts, it is checked by the 
guides which at the same time add a slight impetus to the other 
eccentric. 
The ram for the spirit pump delivers one volume of spirit for 
two reciprocations of each of the three steam pistons. The feed 
pump is double acting. The engine is estimated to give out 
at least one horse power and to weigh about two and a half 
pounds. 
A word of protest may not be out of place here against the 
repeated connection of the flying-machine with dynamite missiles. 
It is natural for the military man to view it as a possible means 
of destroying the enemy from a secure position, but we are not 
all intent on the wholesale destruction of human life ; and there 
is no doubt in the writer’s mind that the flying-machine will tend 
to bring peace and goodwill to all, that it will throw light on the 
few unexplored corners of the earth, and will herald the downfall 
of all restrictions to the free intercourse of nations. 
