142 Miscellaneous Intelligence. 
, 
when the gyroscope was set rapidly revolving, in vain you attempted to 
turn the frame, by turning the board on which it rested, so determin- 
ately did it endeavor to maintain its own plane of rotation, as quite to 
overpower the friction. Inthe third modification of the gyroscope it 
w 
demonstrated the necessary effect of com one rotatory motion 
with another, he then proceeded to demonstrate palpably that the earth’s 
revolving motion affected the gyroscope in isely a similar way. 
would permit the instrument, by its weight, to fall instantly, as soon as 
the support of the hand was taken from it. But, upon imparting to * 
Next, to show the motion of the earth sensibly, he placed the gimba 
gyroscope suspended freely by a fine silk fibre in a stand with the lowe 
steel point of its support resting in an agate cup ; a long light pointer 
projecting from the ring carried a pointed card which passed over @ 
duated card arch of a circle placed concentrically with the gyt 
g' ay ee 
Seope ; upon imparting rapid rotatory motion to the gyroscope, t en 
dex was seen as the earth moved to point out the relative motion of the 
