276 TRANSACTIONS OF THE CANADIAN INSTITUTE. [Voxv. VIII. 
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The feed is through the gold base which is hollow. The speed of 
this engine is 6,000 revolutions per minute. When running 100 per 
second, no motion is visible to the eye, but it makes a note like the noise © 
of a mosquito caused by the vibrating piston-rod. 
The horse power is 1-498000 of one horse power. I am indebted to 
Dr. C. A. Chant, of the Department of Physics in Toronto University, for 
a careful estimate of speed and horse power. 
He estimated the speed by means of tuning forks of known vibration. 
SPEED, 6000 Per MINUTE 
4 
ORS Fr PART 
(Engine .... 4 grains. 
720 a = eer’ / ae 
IG 20 === Ade the 
280,000 ” eee rf fon 
Pen sketch showing details of ‘Tiny Tim” the Smallest Engine. 
To look at a small object without a magnifying glass is a poer way 
to see it. You miss the detail of its construction, so I have had prepared 
a few lantern slides, which will enable us to see the action, and compare 
the size of the engines with well known objects and with each other. 
We will use compressed air as the most convenient for operating 
the engines, and here it may be noted, that the stream of air necessary 
to make the Jarge engine hum, may be sustained on the eyeball without 
winking or causing any inconvenience. 
After the slides are shown, you are invited to come forward and 
