SAVE With The ALL NEW Aloe-Petrolite VENTILATED FUME HOOD Removes fumes without loss of conditioned air Simple in design /
Economical to install /
Easy to m a i n t a i n . I n
addition to protecting laboratory personnel from obnoxious or toxic gases, the Aloe-Petrolite Fume Hood saves conditioned air. Not only in the room where it is installed, but in the entire building. Losing cooled or heated air through fume hoods places an extra load on refrigeration and heating equipment. Result: unnecessary expense. But—by using outside air instead of room air, to carry off fumes, waste of conditioned air is stopped. This hood does just that. It operates as an independent unit, completely isolated from rest of room. And in air con ditioning savings it can pay for itself. X
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A N O T H E R ' M E M B E R OF T H E
Descriptive bulletin and all details are yours (or the asking. Write or call us today.
IVTODULINE FAMILY OF FINE CASEWORK
aloe scientific DIVISION OF A. S. ALOE COMPANY General
Offices
5 0 5 5 Kingsbury · St. Louis 12, Missouri FULLY STOCKED
DIVISIONS
CO AST-TO-CO
AST
Circle No. 14 on Readers' Service Card
CARL
The Famous
ZElSS
ABBE REFRACTOMETER Incorporates t h e following features :
• R a n g e of measurements : n D 1.3 t o n o 1.71 a n d sugar percentage scale 0 % to 9 5 % . F o r liquids a n d solids b y t r a n s m i t t e d a n d reflected light. • Measuring surface of index prism always at horizontal position. • Observation telescope m o u n t e d stationary a t a n inclined position t o carry o u t m e a s u r e m e n t s a t a relaxed posture. • Border line of total reflection a n d scales a r e observed simultaneously in telescope. • Measuring prism in heating m o u n t c a n b e easily interchanged.
M A D E IN WEST G E R M A N Y
• All movable p a r t s are fully protected b y being entirely enclosed within t h e housing. • Special index prism in heating m o u n t available for measurements u p t o nD 1.85 (on special order only).
Write for free detailed
• F o r highest-accuracy measurements, a n U l t r a - T h e r m o s t a t with different constancy of t e m p e r a t u r e ± 0 . 0 0 5 ° is available a s a n accessory.
CARL
ZEISS,
INC.
4 8 5 F I F T H A V E N U E , N E W Y O R K 17, Ν. Υ Circle No. 2 on Readers' Service Card 96 A
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ANALYTICAL CHEMISTRY
GUARANTEED UNINTERRUPTED REPAIR SERVICE
literature.
