WACO SEMI-MICRO APPARATUS New Booklet — AC-7 — with complete listing of Semi-Micro is yours for the asking.
Cast aluminum head centrifuge for semi-microprocedures. Com pletely safe. Economically priced. Silent. Ruggedly-built f o r long life. For 3 " and 4 " test tubes
NO WAITING
No. AC-2314-M.
. . .the W A C O per mits quick stopping through slight palm pressure!
W A C O Separator. For Π 0 V. 6 0 cycle.
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$47.00
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A t t h e price, W A C O Spatulas class as "Non-Returnables!" Dissolved o x y g e n , which m a y b e p r e s e n t in p a r t s - p e r - m i l l i o n c o n c e n t r a t i o n in h y d r o c a r b o n s , is a h a r m f u l . i m p u r i t y in c e r t a i n c a t a l y t i c conversion processes. It is d e t e r m i n e d b y p o t e n t i o m e t r i c t i t r a t i o n w i t h chromous c h l o r i d e a f t e r b e i n g flushed f r o m the h y d r o c a r b o n b y a carefully purified stream o f nitrogen
HAND FINISHED Spatulas, perfectly shaped for Semi-Micro Qualitative a n d Organic Chemistry. W A C O Monel Spatulas are nicely balanced, permanent pieces. Glass ware breakage is reduced, as scratching is eliminated. No. AC-7027. W A C O Monel Spatulas 175 mm. long, blade 2 3 X 5 mm. tapered to 3 mm. width. Slightly dished t i p t o hold crystals. Bottom rounded. $3.10 p e r d o z . , $24.00 p e r 100.
RED STYRENE PLASTIC TRAYS for S e m i - M i c r o Bottles Beautiful . . . reagent resisting strong. Styrene Plastic! N o . AC-790S. WACO Plastic Tray. For 14 Dropper Bottles, 1 5 ml. Each 60^ No. AC-7995-B. For 12 bottles, 3 0 ml. Each 60ji Write lor Semi-Micro Catalog No. AC-7 LABORATORY SUPPLIES AND EQUIPMENT A d i f f e r e n t i a l a u t o m a t i c t i t r a t o r which possesses h i g h a n d a d j u s t a b l e sensitivity is a p p l i e d in t h e precise a n d r a p i d t i t r a t i o n o f small amounts o f chlorides in t h e presence o f l a r g e q u a n t i t i e s o f a l k a l i m e t a l salts
WILKENS-ANDERSON CO. 4525 W. DIVISION ST.
CHICAGO 5 1 , ILL
Circle Nos. 49A-1, 49 A-2, 49 A-3 on Readers' Service Card, page 73 A VOL. 29, NO. 7, JULY 1957 · 4 9 A
