90 



CENTRAL SCIENTIFIC CO., CHICAGO, U. S. A. 



No. 1402. 



No. 1390. 



No. 1403. 



1390. BLOWER, Automatic Electric Air Compressor and Exhaust Pump Combined. Provided with 

 switch for automatic starting and stopping of the motor at variations of pressure. This switch 

 operates only when the pump is used for pressure and the tank is connected only with the 

 pressure outlet of the pump. Suction is obtained by attaching a tube to a hose nipple at the 

 base of the cylinder. Complete with four gallon tank, pressure gage and motor compactly 

 mounted on one base, 9%x32 in. 



Bore, in ........................ 1% 



Stroke, in ...................... 2% 



Free air per minute at 200 r. p. m., 



eu. ft ........................ 1% 



No 



For volts 



Size of motor, h. p 



Each . 



For pressure up to, Ibs . . 40 



Vacuum up to, in 26 



Height over all, in 25% 



Weight, Ibs 92 



ABC 



110A.C. 110 D.C. 220 B.C. 



% % % 



$89.00 75.00 77.00 



1396. TANK, of heavy galvanized iron, 12 gallons capacity, with 50 Ib. pressure gauge, petcock on 

 upper end and two % in. iron pipe size bushings in the side for making connections. Dimen- 

 sions over all, diameter 12 in.; height, 30 in 10.00 



1402. BLOWER and VACUUM PUMP, Crowell Rotary (No. 0-D). This pump is used principally for 



vacuum work, giving from 29 to 30 in. of mercury, according to atmospheric conditions. It is 

 fitted in an oil immersion box, which makes it practically leak-proof. Capacity about 2 cu. ft. 

 of free air per minute. Inlet and outlet tapped for % in. pipe size. Requires about % h. p. 

 to operate , 65.00 



1403. BLOWER and VACUUM PUMP, Crowell Rotary. Same as No. 1402, but without the oil immer- 



sion box 52.00 



