LABORATORY SUPPLIES AND CHEMICALS 



181 



2972(a) 



2975 



2972a Gas Recorders. Moisture, dust and fume proof. Protable type provided with 

 U-gauge for testing the recorder. For pressure or vacuum. 



With U-gauge 8-inch $47.00; 10-inch $55.00 



Without U-gauge 8-inch: . . .$38.00; 10-inch 44.00; 12-inch 52.00 



2973 Gas Regulator, Roux, Bi-metallic, designed to meet the demands for an accurate 

 regulator without the use of mercury or glass in its construction. It is 

 particularly well adapted for Incubators and other Ovens where a constant, 

 even temperature is desired. Inlet tube E is connected by means of rubber 

 tubing to the gas supply; the outlet D is connected in the same manner 

 with the burner under the incubator. A is a set screw to regulate the flow 

 of gas, and B a lock nut; C is a small set screw for pilot light. Diameter 

 of tube, 1 inch. 



Small size, 10 inches long '. $10.00 



Large size, 12 inches long 11.00 



2973(a) Gas Regulator, Thermo-Regulator, Roux. Same as above, but made for 

 high temperature. In two sizes: 



Small, 10 inches long 11.00 



Large, 12 inches long 12.00 



2973 (b) Gas Regulator, Greenman's, made entirely 

 of steel. The gas entering at "C" must pass 

 the valve "H" before passing to the burner 

 through "D", excepting that a small quan- 

 tity, determined by the screw valve "J" 

 passes through the by-pass "I" to main- 

 tain the pilot flame. The mercury in the 

 tube "A" when expanded raises the valve 

 "H" against the conical valve seat "G" and 

 the valve is prevented from falling too far 

 by the pin at "O." The volume of the mer- 

 cury is controlled by the rod "K," which 

 is held in place by the screw "L." By ad- 

 justing the rod "K" and the screw valve 

 "J" an extremely accurate control of the 

 gas supply and the temperature may be 

 maintained. The slightest increase in the 

 volume of the mercury contained in the 

 tube "A" produces a considerable differ- 

 ence in the height of the mercury in the 

 2973-3b passage "F" and the float "H," which is 



about two-thirds submerged in the mer- 

 cury, is carried upward and closes the valve 

 "G." The brass tube into which the regu- 

 lator is to be inserted should be filled with 

 glycerine 12.00 



2975 Gas Pressure Regulator, Murrill's latest and most convenient form, for use 

 with a thermostat. A constant temperature can be maintained regard- 

 less of the pressure variations in the gas supply, with two outlets.. . . 10.00 



Gas Regulator, see also Thermostats. 



