360 THE OUTGO OF ENERGY 



to the lever of the work adder at a distance from 

 the axis of the pulley equal to the radius of the 

 pulley. Connect the muscle with the secondary 

 coil of an inductorium arranged for single maxi- 

 mal induction currents. Measure the distance of 

 the pulley weight from the level of the axis of 

 the pulley. Stimulate the muscle with induc- 

 tion currents at intervals of one second until the 

 fatigued muscle ceases to contract. (Stimulation 

 may be made by opening and closing a simple 

 key in the primary circuit in unison with the 

 beat of a metronome.) 



Measure the height in millimetres to which 

 the pulley weight has been lifted. Multiply this 

 height by the weight. The product is the total 

 work done in gram-millimetres. 



Total "Work done estimated by Muscle Curve. 

 The total work done by the muscle may also be 

 estimated by measuring in millimetres the height 

 of each successive contraction recorded on the 

 smoked paper, adding the several heights together, 

 dividing the sum by the number of times the 

 distance from the fulcrum of the recording lever 

 to the point of attachment of the muscle is con- 

 tained in the distance from the fulcrum to the 

 writing point, and multiplying this quotient by 

 the sum of the pulley weight plus the weight of 

 the lever. 



