214 MUSCLE. 



2. Attach the electric style to the side bar of the stand 

 and wire it to the table binding screws. Include a key 

 in this circuit. Put the plug corresponding to your table 

 number into the 96th seconds of the time-board, close the 

 key, and ascertain that it works properly. The time record 

 may be written directly beneath and simultaneously with the 

 muscle curve if great exactitude is required. It is not 

 necessary to do so in the present case, as the drum will 

 revolve with a constant speed during the performance of the 

 experiment, which only takes a short time to carry out. It 

 may be inscribed immediately before or after the muscle 

 tracing. 



3. The muscle preparation is made as previously directed, 

 but the nerve is cut off close to the muscle (nerveless muscle). 



After fixing to the clamp, connecting the tendon to the 

 writing point, and applying the load, hook one thin wire 

 round the tendon and one round the femur. The former 

 must not impede the movement of the muscle nor draw it 

 to one side. The wire should be wound into a spiral. 



4. Mark the paper overlap at the top by sweeping off some 

 of the blacking with your finger. This is to act as a guide 

 for the application of the writing points when the drum is 

 revolving. 



Set the latter so that the drum contact shall occur when 

 the writing points are clear of the overlap by 10 cm> 



5. Adjust the writing points : Draw the stand clear of the 

 drum, push the handle which rotates the pillar up to the 

 stop, see that the muscle chamber is firmly fixed. Arrange 

 the points of muscle and time recorders to write in the same 

 plane and as near to each other as possible, draw the drum 

 up to the stand until the recorders are in equal contact with 



