STETHOGRAPH DRUM, KIDNEY ONCOMETER 



Fig. IS. Stethograph drum, made of 2 </ 2 inch brass tubing. The drum has a length 

 of 1 54 inches and wire rings are soldered around the edges to act as flanges for holding 

 on the strings used to tie down the rubber membranes. (For the method of tying on 

 these membranes and attaching the screws in the center, see Fig. 374 in the chapter on 

 shop work.) These stethograph drums are not on the market but can easily be made 

 by any janitor or technician. 



Fig. 16. Kidney oncometer, about 2/3 natural size, made of sheet brass. The lid 

 is placed under the kidney and the box closes over the organ. The latches are turned 

 inward. The opening out of the oncometer is at the rear as seen in the picture and the 

 opening passes forward in the square tube into which the round connecting tube is 

 soldered. 



