CHARLES B. WARRING. 169 — 
‘‘that the distance drawn out will not be simply propor- 
tional to the weight hung on the lower hook, as in ordi- 
nary spring balances,”’ that, in fact, the weight will not 
hang down at all, but that the lower gyroscope will rise 
until its axis points vertically upward. 
These are radically different results, and show that 
either nature, or Sir William Thomson, hasa wrong con- 
ception of the action of this instrument. 
My apparatus is on the table. It has as you see, only 
two gyroscopes, (Fig. 3) while his diagram has four, but 
~ you will recall his remark, *‘ Only one set is needed, the 
other being merely for symmetry.”’ 
I had one with four wheels, but this one is much more 
easily manipulated. 
At the top of the shaft (Fig. 3) is a saucer shaped de- 
Fig. 3 
HUUUUCUENUUOUUOUECOGOQOUUAOGEOUUNOONUOUOQOUUCTOEUOQUOGOTEEAUOEENGOOUOEOEUOOOOEGUOUU EEE AU AA 
pression in which rests the conical point of an adjustable 
screw ; both the point and the depression are of very 
hard and highly polished steel. 
The two gyroscopes are connected by a stiff piece of 
. sheet brass with almost frictionless hinges at each end. 
By this arrangement there is great freedom of movement 
in the vertical plane passing thro’ both axles. On each 
gyroscope is a rod in the prolongation of itsaxis. These 
119 
