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"How dry
I am..." NALGENE® ASPIRATOR C A R B O Y With S P I G O T
(Cat. No. 2318}
Model Ν capillary sodium electrode is designed to measure sodium concen tration in physiological solutions. Housed completely in polypropylene, it is especially suited for working with small sample sizes. Samples may be introduced to the electrode either by syringe through the luer fitting (top) or through the thumb-operated peri staltic pump and plastic capillary (bottom). Corning Scientific Instru ments, Corning Glass Works, Medfield, Mass. 0 2 0 5 2 415
C a n ' t leak, w o n ' t o o z e , d o e s n ' t dribble—because the threaded boss is integrally molded as part of the o n e - p i e c e b o d y . This p r e c i s i o n m o l d i n g t e c h n i q u e assures no leaks, ever! T w o Teflon* O-rings p r o v i d e a p o s i t i v e seal f o r t h e needle-type V2" spigot. M o l d e d of conventional polyethylene in 1 , 2, 5, 6V2 and 13 gallon sizes. Excel lent for handling acids, collecting and dispensing distilled water and other liquids. Expect more . . . get more . . . f r o m Nalge—the innovator in plastic labware. Specify Nalgene Labware from your lab supply dealer. Ask for our 1968 Catalog, or w r i t e Dept. 1121A, Nalgene Labware Division, Rochester, New York 14602. 'DuPont registered trademark
NALGE HITTER PFAUDLER CORPORATION
Circle No. 78 on Readers' Service Card
The Dyna-Blender is a dynamic dilu tion system designed to produce ac curate gas mixtures in ppm or per centage ranges. Concentration can be varied in minutes, and mixtures ac curate to 5 % and repeatable to 2 % can be produced. The blender is available in two or four flowmeter units factory calibrated to individual requirements. Internal piping and parts are constructed from stainless steel and Teflon. Matheson Gas Products, P. 0 . Box 8 5 , East Ruther ford, N . J . 0 7 0 7 3 416
WAY
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. . . w i t h unitary construction—like the Nalgene® Unitary Wash Bottle. Dispensing tube and body are pre cision molded as a single unit—no seams, no leaks. A n d , it's easier to use—just squeeze to dispense to the very last drop. It's the only way to make a wash bottle—and we're the only people w h o make one this way. Nalge . . . innovator in plastic labware. Specify Nalgene Labware from your lab supply dealer. Ask for our 1968 Catalog or w r i t e Dept. 1121, Nalgene Labware Division, Roch ester, Ν. Υ. 14602. Also available: Teflon* Wash Bottles (4-32 oz.); Safety Wash Bottles, red polyethylene, vertical ribbing. (8 and 76 oz.). *DuPont Trademark
NALGE RITTER PFAUDLER CORPORATION
Circle No. 71 on Readers' Service Card VOL. 4 0 , N O . 1 1 , SEPTEMBER 1 9 6 8 ·
147 A
