LABORATORY SUPPLIES AND CHEMICALS 



245 



3691(a) 



3691(b) 



3691(c) 



3691(a) CONNECTIONS, of brass, with hydrant thread for filter pumps, in three 



sizes to fit the various filter pumps 1 /%, J4, ^-inch I. P. thread $ 0.50 



3691(b) ROYLE CONNECTIONS for filter pumps to connect to smooth faucet. 

 Cannot leak or be forced off; in three sizes to fit the various filter 

 pumps */&, l /4, $i-'mch I. P. thread 75 



3691(c) CONNECTION, of brass, with hydrant thread, for extra large Filter 



Pump No. 3690. Richard's extra large 1.00 



369S 



3693 



3692 PUMPS Filter on base, with vacuum gauge and with stopcocks at water 



and air connections $ 8.75 



3693 PUMPS Filter Pump, of brass, with vacuum gauge, without stopcocks 



at water and exhaust connections. Each 10.00 



8695 PUMPS As above, without gauge 6.50 



3697 PUMPS As above, without stopcocks (with gauge) ... 8.00 



3699 PUMPS As above, without stopcocks or gauge 4.50 



VACUUM. 



3701 



3701 PUMPS Laboratory Water Jet Vacuum Pump. For the rapid creation 

 and maintenance of a vacuum for filtration, etc. Complete, as shown 

 in illustration, including exhauster, vacuum gauge, connecting tee 

 and two cocks $17.50 



3701(a) PUMPS Laboratory Steam Jet Vacuum Pump. Same as above, but con- 

 structed for operation by steam. Complete, as illustrated, including 

 exhauster, vacuum gauge, connecting tee, stock and check valve 17.50 



