thenewcenco® HYVAC®-7 High V a c u u m P u m p
THE VIBRATION'S GONE . . . and so is the noise No. 91505,60 cy. 115/230 volts
S254.50 No. 91500, same as No. 91505, but without motor or base $199.50 Also available with motors for other voltage requirements or with explosion-proof motors. Prices on request.
H e r e ' s a v a c u u m p u m p t h a t is so carefully designed . . . so expertly machined . . . so perfectly balanced . . . t h a t vibration h a s been reduced t o a n absolute m i n i m u m . Result . . . smooth, quiet operation. You can h a r d l y h e a r i t a s i t r u n s . I n fact, i t s noise level is lower t h a n t h a t of a n y similar p u m p . T h e new Cenco Hyvac-7 has more p u m p i n g capacity per cubic foot of space occupied t h a n a n y o t h e r vacifum p u m p now available. I t produces a free air displacement of 70 liters per m i n u t e a n d a guaranteed u l t i m a t e v a c u u m of 0.1 micron. T h i s p u m p i n g speed i n t h e low micron r a n g e is exceptionally high. T h e ratio of p u m p i n g speed a t 1 micron t o t h a t a t atmospheric pressure is 4 9 % . And i t p u m p s from atmospheric t o u l t i m a t e pressure i n less t h a n five minutes. T h i s finest, most efficient of all v a c u u m p u m p s is now ready for shipment. Order t o d a y or write for Bulletin N o . 13.
cenco The most complete line of scientific instruments and laboratory supplies in the world
Central Scientific Company 1708 I R V I N G PARK ROAD BRANCHES AND OFFICES —CHICAGO DETROIT
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SAN FRANCISCO
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CHICAGO 1 3 , ILLINOIS NEWARK . BOSTON . WASHINGTON
SANTA CLARA
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LOS ANGELES
CENTRAL SCIENTIFIC CO. OF CANADA, LTD. —TORONTO . MONTREAL VANCOUVER
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OTTAWA
REFINERY SUPPLY COMPANY —TULSA . HOUSTON For further information, circle number 43 A on Readers' Service Card, page 51 A
V O L U M E 2 7 , N O . 5, M A Y 1 9 5 5
43 A
