CARL
The famous
ZEISS
ABBE REFRACTOMETER Made in West Germany
is available i n c o r p o r a t i n g t h e following features : • Range of measurements: n o 1.3 to n o 1.71 and sugar percentage scale 0 % to 9 5 % . For liquids and solids b y transmitted and reflected light. • Measuring surface of index prism always at horizontal position. • Observation telescope mounted stationary at an inclined position to carry out measurements a t a relaxed posture. • Border line of total reflection and scales are observed simultaneously in telescope. • Measuring prism in heating mount can be easily inter changed. • All movable parts are fully protected by being entirely enclosed within the housing. • Special index prism in heating mount available for measurements up to HD 1.85 (on special order only). • F o r highest - accuracy - measurements, an UltraT h e r m o s t a t with different constancy of temperature ± 0 . 0 1 ° is available as an accessory. Free detailed literature sent upon request
CARL ZEISS, INC.,
485 F i f t h Ave., New Y o r k 17, Ν . Υ.
Guaranteed, uninterrupted
repair service
For further information, circle number 69 A-1 on Readers' Service Card, page 77 A
UP TO
20%
N e w Formula Lead
in the D U - A L L
send for new catalog of finest imported porcelainware
MECHANICAL PENCIL
marts w·· tabes and beakers better!
Famous H A L D E N W A N G E R Porcelainware—first time available in the U. S. in complete selection, large quantity. Inter nationally recognized as very highest quality. But l o w cost West German manufacture gives prices 1 5 % - 2 0 % b e l o w U. S.make average. EXAMPLE: Crucibles of whiter, Finer textured German porcelain, in greatest size selection anywhere. Extremely uniform measure ments. Immediate delivery.
KERN LABORATORY SUPPLY CO.
Marks on Anything. Non breaking strength beyond normal needs. Writes with liquid-like ease. Streak-free color covers evenly, is dur able, yet removes by a d a m p cloth. Try a new Blaisdell DU-ALL soon!
America's Leading Importer of Fine Laboratory Equipment Kern Laboratory Supply Co., Dept. A-1 8639 Venice Blvd., Los Angeles 34, Calif. Please send FREE C A T A L O G S of Haldenwanger porcelain. ware, Jena laboratory glassware, and plastic materials.
Name
6 MATCHING COLORS At your dealer — OR WRITE FOR SAMPLE ON YOUR LETTERHEAD
PENCIL
CO.,
BETHAYRES,
Circle No. 89 A-2 on Readers' Service Card, page 77 A
Title
Company .
.
Address
.
City
BLAISDELL
LOWER COST
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Zone..
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PA. Circle No. 89 A-3 on Readers' Service Card, page 77 A VOL. 29, NO. 6, JUNE 1957 · 8 9 A
