208 ANNUAL REPORT SMITHSONIAN INSTITUTION, 1914. 
This top admits of a large variety of designs. It is easy to imagine 
a gyrostatic circus rider performing balancing feats on the back of a 
gyrostatic horse! 
I conclude with a gyrostatic model (fig. 19) which depends for its 
action upon an entirely novel and practical method of operating a 
gyrostat or gyrostats. The method has a very large variety of appli- 
cations, into which I shall not enter at present. It is here shown 
applied to a motor car. The car runs on two wheels in tandem; 
it can be set to run either in a straight path or a path curved in either 
direction. The arrangement includes two parts connected by a ver- 
tical or nearly vertical hinge. Each is supported on a single wheel. 
The front part carries a gyrostat with axis horizontal (in this case), 
the afterpart contains the propelling mechanism. A quasi-gravita- 
tional field of force is produced by the propeller behind acting through 
the hinge, and the construction is such that there is true stability, 
not the quasi stability, accompanied by contimually increasing 
gyrostatic oscillation, which obtains in many other cases. 
