184 



HARRY B. SHAW 



_^\, 



Fig. 1 



Fig. 2 



Fig. 1. Psychrometer with protective cage attached, a, shank of drill; h, b, 

 machine screws attaching protective cage to shank; c, protective cage; d, revolv- 

 ing frame supporting the thermometers; e, axis carrying the revolving frame;/, 

 bent wire pin securing revolving frame to axis; (/, machine screws engaging with 

 projecting jaws of drill to assist in carrying the frame d around. 



Fig. 2. Psychrometer with separate protective cage (left), a, shank of drill; 

 b, machine screws attaching transverse arms, h, to the shank ; d, revolving frame ; e, 

 revolving axis;/, bent wire pin securing frame to axis; p, machine screws engaging 

 with jaws of drill to assist in revolving frame d; h, transverse arms to support in- 

 strument in cage (at left) ; {, hole in transverse strip of cage to steady the axis e. 



