1899-1900.] Mr Mahalanobis on a New Form of Myograph. 63 
forwards as necessary. The armature (K) of the electro-magnet is 
hinged at the top, and its lower end — which is provided with a 
hook — can, when not held by the electro-magnet, freely swing 
forward. The small pulley (P) on the opposite side has a hole 
passing right through the centre of the support, so that a thread 
A, lever ; B, clamp ; C, ebonite block ; E, electrodes ; F, support for elec- 
trodes ; G, ebonite base ; H, support for electro-magnet ; M, electro- 
magnet ; K, armature ; P, pulley ; N", screw for clamping instrument on 
stand ; R, fine adjustment for bracket. 
attached to the proximal end of the lever, stretching over the 
pulley can pass through this hole and suspend, below the instru- 
ment, a very light scale-pan carrying a small weight. The pulley 
being made on the principle of a caster, readily adapts its position 
in accordance with the movements of the lever. The four binding 
screws on the top of the ebonite plate are respectively connected 
