This is the NRC Rotary Gas Ballast Combination Pump Model NRC 200M. Other single and compound units with capacities from WA to 400 C F M j blank-offs down to 5 x 10'6 mm. Hg.
Here's the Only Vacuum Pump Proved to Pump Water Vapor, too! O n just o n e h u m i d d a y a m e c h a n i c a l v a c u u m p u m p m a y b e asked t o digest m o i s t u r e - l a d e n a i r c o n t a i n ing o v e r t w o g a l l o n s o f w a t e r . If this o r a n y o t h e r v a p o r is a l l o w e d t o condense in the p u m p o i l , p u m p d o w n cycles b e c o m e l o n g e r a n d l o n g e r a n d l o n g e r — a real production " h e a d a c h e " . A n oil change, a costly a n d t i m e consuming o p e r a t i o n , is r e q u i r e d t o restore p u m p efficiency. We Need FIVE ENTHUSIASTIC ENGINEERS To Help Us Keep Growing. Mechanical, electrical a n d chemical e n g i n e e r s w h o honestly e n j o y solving novel problems in b r a n d n e w fields a r e o f f e r e d n e w r e sponsibilities a n d m o r e stimulating work. W r i t e Mr. David Tobin o r call De 2 - 5 8 0 0 .
Only NRC Rotary Gas Ballast Pumps have proved — on thousands of installations — that they keep their original high efficiency even when pumping troublesome vapors. Here is the reason: only NRC pumps have been designed around the gas ballast principle, which, with other design features, prevents condensation . . . keeps oil clean . . . maintains original fast pump down time day after day. Send for Bulletin. NRC
EQUIPMENT CORPORATION A Subsidiary of NATIONAL RESEARCH CORPORATION
N RC EQUIPMENT CORPORATION
Dept. 2212, Charlemont Street, Newton Highlands 6 1 , Mass. Please send me the NRC Rotary Gas Ballast Pump Bulletin. Name
Title.
Company Address. City
•Zone.
.Stale.
For further information, circle number 75 A on Readers' Service Card, page 123 A VOL. 4 8 , N O . 12
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DECEMBER 1 9 5 6
75
A
