266 



HERBERT F. ROBERTS 



tray, which is carried by a removable lid when the apparatus is 

 not in use. Close approach to the binocular eye-piece is secured 

 by a curved-in cutting of the table, partly shown in the illustra- 

 tion, in front of which is a double flush-plate switch, controlling 

 both the motor and the lights. The binocular is further pro- 

 vided with a hood, lacking in the original instrument. In figure 

 1, B, the tintometer binocular, is attached to a wooden support 

 S, upon which it slides by a rack and pinion arrangement worked 

 by the focusing screw, s. This enables the apparatus to be brought 

 within proper observing distance from the revolving spindles. 

 The support S is hinged to a base B, and rests back upon the 



Fig. 3. Top view of case, showing annular, C; pulley groove, V; fiber gears, 

 B; reversing screw, F; reversing lever, G. 



top of a screw Si, by which the slope of the binocular can be ad- 

 justed. The base B in turn slides as a whole upon a bed plate Bi, 

 which is moved backward and forward by means of a screw S 2 , 

 and the upper part of it is moved laterally across the spindles, 

 Sp by means of the screw S^. It is thus possible to get four 

 different sets of adjustments for the apparatus as reconstructed. 

 At Si is a screw which reverses the drive mechanism. 



