416 



CENTRAL SCIENTIFIC CO., CHICAGO, TT. 8. A. 



No. 11010. 



No. 10992. 



No. 10994. 



No. 11012. 



10992. PUMP, AIR, Vacuum, Lever Action, with two valves; polished brass cylinder, 56 mm diameter, 

 stroke 16.5 cm; air pump plate of glass, 25 cm in diameter, ground plane and resting in a cast 

 iron mold, with guard plug and vent screw; base and pillar of polished hardwood, mahogany 

 finish. Base 25x60 em $25.00 



10994. PTJMP, ATE, Vacuum, Geryk Design. This oil sealed pump is manufactured by us and has all the 



excellencies of this well-known design. It has no valves in the usual sense of the word, the 

 pistons working in oil, which follows and seals the inlets and outlets so that leakage is impos- 

 sible. The present model is finely constructed of brass and cast iron, handsomely finished, and 

 is provided with a pump plate of plate glass 25 cm in diameter, cemented in the base. The 

 air opening in the center of the pump plate is fitted with a safety plug which prevents the en- 

 trance of mercury and other undesirable substances, while permitting the free passage of air, 

 and there is also another opening at the side of the base for attachment of pressure gages, etc. 

 The piston is 48 mm in diameter with a 9 cm stroke and is operated by a hand wheel grooved 

 for %6-in. round belt, as shown in the illustration. A vacuum of 0.15 mm may be obtained. 

 45.00 



10995. COUNTERSHAFT, for use with No. 10994 Air Pump when it is desired to use electric motor 



drive. This countershaft is mounted on No. F197 Clamp and when used with a % horse power 

 motor of 1800 r. p. m. with a 1^-inch pulley, will drive No. 10994 at about 55 r. p. m ... 7.50 



AIR PUMP ACCESSORIES 



11010. AIR PUMP PLATE, of iron, 20 cm in diameter, cast in one piece to minimize danger of leak- 

 age. Ground plane and provided with brass stop cock. The vent hole at the center is tapped 



(%6~16) for air pump accessories and provided with guard plug (No. F1941) 5.00 



11012. AIR PUMP PLATE, of heavy plate glass, 25 cm in diameter; ground plane and firmly cemented 

 in a low form tripod base of iron. The base is cast in one piece to minimize danger of leak- 

 age and provided with brass stopcock and brass connecting tube with oil-sealed taps for inlet 

 of air and for manometer. Finest workmanship throughout. The vent hole at the center is 

 tapped (%6"16) f r a ' r pump accessories and provided with a guard plug (No. F1941) . . 12.00 

 For PRESSURE TUBING, see general heading, Rubber Tubing. 

 11020, OIL, Pump. Especially adapted for lubricating air pump cylinders and for use in oil sealed 



pumps such as No. 10994 Per half -pint can .30 



11022. OIL, Pump. Especially adapted for use in the Cenco-Nelson High Vacuum Pumps. In metal 

 cans. 



No A B C 1) 



Size 1 pt. 1 qt. 1 gal. 5 gal. 



Per can 25 .35 1.25 5.00 



11028. VACUUM WAX. The best preparation on the market for using on apparatus in connection with 

 the Air Pump, especially where high vacua are desired. Will not injure the pump plate or ap- 

 paratus. Will not harden and can therefore be easily removed. Superior to vaseline, tallow 

 or heavy oil > Per 4 oz. jar .30 



