408 
Proceedings of the Royal Society of Edinburgh. [Sess. 
In fig. 2 is shown a new stilt top due to the author. The construction 
of the instrument will be clear from the figure. A gyrostat is mounted as 
shown in two pivots, carried by a frame supported on two legs terminating 
in points. The pivots engage in sockets arranged in the frame of the 
gyrostat. The pivots are in the plane of the flywheel and lie in a plane 
at right angles to that containing the legs. Attached to a rod carried by 
the frame of the gyrostat, and in line with the axis of the gyrostat, is a 
weight. If the gyrostat is spun rapidly and the arrangement is set down 
on a table with the axis of the gyrostat, the rod carrying the weight, and 
the legs in one vertical plane, it will balance on the legs though doubly 
unstable without spin. The explanation of the action is given in a paper * 
by the author and Mr G. Burnside, and need not be repeated here. 
In figs. 3, 4, and 5 are shown three gyrostatic bicycle-riders. The 
* “ On a Continuous-current Motor-Gyrostat with Accessories for demonstrating the 
Properties and Practical Applications of the Gyrostat,” Proc. Roy. Soc. Pdin., 1912. 
