N o w every laboratory o a n afford a precision mass spectrometer High sensitivity
at low cost
for plant, field, and
laboratory
Now you can improve your process control or analytical service with a n inexpensive, portable mass spectrometer. CEC's completely new 21-611 adapts easily to installation in a trailer, on a bench — wherever there is space for the 11 5-lb unit. The instrument covers mass range 2 through 80, with automatic scanning from mass 12 to 40 requiring only 3 minutes. Extremely rugged and simple to operate, the 2 1-611 consists of separate electronic and vacuum modules which may be operated stacked or apart. Ingenious design for trouble-free operation has eliminated the conventional cold trap, one forepump, magnet shunt, and several vacuum tubes. Investigate this outstanding value by calling your nearby CEC field office, or write for Bulletin CEC 1843-X5. Capable of analyzing minute samples of gases, gaseous mixtures, o r vaporized liquids with precise accuracy, the economical 21-611 offers automatic programming o f control mechanisms and a unique scanning dial which eliminates mass marking. Complicated sample introduction procedures are unnecessary with the simplified hatch inlet system featuring a single all-metal rotary valve. Entire portable unit weighs only 115 p o u n d s .
Consolidated Electrodynamics ffeèçl
300 North Sierra Madre Villa, Pasadena, California
O F F I C E S
IN RRIN C I P A L
CITIES
T H R O U G H O U T
T H E W O R L D NOV.
4, 19 5 7 C & Ε Ν
67
FISHER FORCED DRAFT ISOTEMP OVEN
FISHER GENERAL-PURPOSE ISOTEMP OVEN
to fill your laboratory oven needs
4 FISHER ISOTEMP® OVENS
A superior, gravity-convection o v e n for sample drying, moisture deter mination, ageing, sterilizing, e t c . Maintains temperature c o n s t a n t within ± 0.5° C i n range from 3 5 ° t o 200° C , uniform to ± 1° C throughout the 1 2 " χ 12" χ 12V£" chamber. 3 removable shelves w i t h 430 s q . in. total area.
All t h e features of t h e standard Isotemp — plus t h e advantages of forced a i r circulation. Motor-oper ated blower dries s a m p l e s two to three times faster. Operating range 35° to 175° C, ± 0.5° C control. 3 removable shelves give 400 sq. i n . area in t h e 1 0 % " χ 12" χ 12*4" chamber.
FISHER SENIOR ISOTEMP OVEN
FISHER SENIOR FORCED DRAFT ISOTEMP OVEN
only Fisher Isotemp ovens give you all 7 advantages UNIFORM TEMPERATURE THROUGHOUT CONSTANT,
UNVARYING
TEMPERATURES
For more samples p e r batch at trie same close temperature tolerances and wide range, the Senior I s o t e m p Oven is t h e efficient a n d economical solution. R o o m y 18" χ 1 8 " χ 1 5 " chamber, 4 removable shelves g i v e over 1000 sq. i n . of area. Holds u p to 224 50-ml beakers.
T h e Senior Forced Draft Isotemp processes m o r e s a m p l e s , faster. Blower, housed i n lower section, passes heated a i r u p one side, across samples, down opposite side a n d back i n t o blower f o r recirculation. 4 removable shelves (960 sq. irx. a r e a ) , 16" χ 1 8 " χ 1 5 " chamber.
HIGH HEAT EFFICIENCY LOW INITIAL A N D OPERATING COSTS FUNCTIONAL,
MODERN
DESIGN TWO SIMPLE CONTROLS BUILT-IN
SAFETY
FEATURES
Write for booklet: 101 Fisher Building, Pittsburgh T9, Pa.
FISHER SCIENTIFIC America's Largest Manufacturer-Distributor o f Laboratory Applionces & R e a g e n t Chemicals
IN THE U.S.A. Boston Buffalo Charleston, W . V a .
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B-22
