TRANSACTIONS OF SCIENTIFIC SECTION. 135 
APRIL 23, 1889—SEVENTY-FOURTH REGULAR MEETING. 
Charles B. Warring, Ph.D., chairman, presiding ; 
twelve members and several guests present. 
The chairman, Dr. Warring, read the following paper : 
A CURIOUS GYROSCOPIC PHENOMENON—ITS RATIONALE—AN 
APPARENT LOSS OF ENERGY, AND AN EFFORT TO 
SHOW WHAT BECOMES OF IT. 
If a rapidly revolving gyroscope be held in one’s hand, 
and an attempt be made to turn it quickly from its posi- 
tion to another perpendicular to the first, a strong re- 
sistance will be experienced. And this resistance will be 
proportioned to the abruptness of the change of position. 
The phenomenon is a very curious one, and never fails to 
excite surprise. 
To study this effect, I devised and had constructed the 
apparatus before you. (See Fig. 1.) 
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It consists of an ordinary gyroscope, mounted ina very 
stiff iron frame, which is securely bolted to the table. 
The axis of the gyroscope is horizontal, and supported 
in the usual manner in a ring, which is itself supported 
by two pins, whose axes and the centre of the wheel, or 
disc, are in a vertical straight line. The disc revolves 
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