270 
Mr Sears, On the Longitudinal Impact 
with the fork, 0. The withdrawal can be roughly adjusted by 
sliding the wire, D, up and down the tube, M, and clamping by 
means of the screw, iV. Fine adjustment is obtained by screwing 
the stop, G, up or down. The release is then effected by blowing 
the fuse, and when once the adjustment has been properly made, 
the same withdrawal may be repeated as often as we please 
by simply inserting fresh fuse wires. When the fuse is blown, it 
will be seen that the dropper falls freely with the acceleration of 
gravity. The rod, however, starts with a much smaller accelera- 
