APPENDIX. 



base, so as to stand firm without clamping down. It is made by C. F. Palmer, 



5 Kellett Road, Brixton, S. W. 



It costs as above ^5126 



Or with levelling screws (vertical and horizontal) . . .600 

 Extra for automatic break-key (as shown in position) . .086 



FIGL 288. Sherrington's Drum. 



Professor de B. Birch's System of Recording Apparatus. The following 

 description applies to a system of recording apparatus devised for the Experi- 

 mental Laboratory in the New Medical School buildings of the Yorkshire 

 College. The motive power, a small Chicagos top, is geared for reduction of 

 speed to a 54-inch bicycle wheel, and this again by a cord to a piece of shafting, 

 19 feet long, running on ball bearings and supported by brackets fixed to the 

 wall of the Laboratory. The shafting carries step cones (I, fig. 289), to these the 

 drums are geared by cords which run over guide pulleys suspended from the 

 ceiling in convenient positions. The tension on these cords is kept constant 

 by counter weights (L), which allow the former the play required in shifting 

 from one speed to another on the cones when changing the rate of revolution 



2 B 



