Pick the Vacuum Pump that Fits Your Needs!
building-blocks of heat for your experimental work
1 397B—TWO-STAGE (Vented Exhaust) 0 1 MICRON 425 LITERS/MINUTE
1398—TWO-STAGE (Vented Exhaust) 0.1 MICRON 1400 LITERS/MINUTE
I400B—TWO-STAGE 0.1 MICRON 21 LITERS/MINUTE
1404H -SINGLE-STAGE (Wegner Pump) 20 MICRONS 33 4 LITERS/MINUTE
1 4 0 3 B — SINGLE-STAGE 5 MICRONS 100 LITERS/MINUTE
1405 H—TWO-STAGE 0.05 MICRON 3 3 . 4 LITERS/MINUTE
New Heui-Duty 1000° and 1200° C. heating units make experimental heating installations economically practical
For applications that cannot justify the purchase of standard laboratory or i n d u s t r i a l h e a t processing e q u i p m e n t , low-cost Hevi-Duty electric heating units are ideally suited. They are available in a complete range of sizes and lengths, in fiat and semicylindrical shapes to serve a comprehensive variety of heating functions. Heating units from Hevi-Duty Electric Company have these specific advantages: High temperature capacity—room temperature to 1000° C. or 1200° C. with fast heat transfer. Quick heat up — high watt density. High heat efficiency. And long operating life. Respond quickly to manual or automatic control. For details, request Bulletin 5091. Available from leading laboratory supply houses.
HEVI-DUTY®
®
B P
HEVI-DUTY HEATING EQUIPMENT COMPANY WATERTOWN, WISCONSIN/A DIVISION OF BASIC PRODUCTS CORPORATION
Circle No. 64 on Readers' Service Card ·
ANALYTICAL CHEMISTRY
1406H —SINGLE STAGE 5 MICRONS 33.4 LITERS/MINUTE
1392—TWO-STAGE (Mechanical & Diffusion) 0.001 MICRON 600 LITERS/MINUTE' (at 0.1 micron)
1410B—SINGLE-STAGE (Wegner Pump) 2 0 MICRONS 21 LITERS/MINUTE
Pat. N o . 2 , 3 3 7 , 8 4 9
DUO-SEAL VACUUM PUMPS are designed to fit almost every application better and at less cost . . . in the laboratory, industry and school. Ten different models to choose f r o m . . . capacities from 21 to 1400 liters per minute . . . ultimate pressures from 2x10— 2 mm Hg down t o i x 10—4 mm Hg and better . . . two-stage and singlestage mechanical pumps with vented exhaust, and mechanical and diffusion combination pumps. Over the years, Welch Duo-Seal Pumps have built a world-wide reputation for best p e r f o r m a n c e , greatest reliability and quietest operation. When you use a Duo-Seal Pump, you're using the best! , .,. . For c o m p l e t e spécifications and prices, a s k for D u o - S e a l C a t a l o g
Write Dept. AC-1
C 92 A
1402B—TWO-STAGE (Vented Exhaust) 0.1 MICRON 140 LITERS/MINUTE
[SINCE 11880
THE WELCH SCIENTIFIC COMPANY foremost manufacturers ο
1521 Sedgwick St. ·
Chicago 10, III.
Circle No. 165 on Readers' Service Card
