THE 3RD GOOD REASON Why ~
COORS is the best buy COMPLETE LINE OF ITEMS
COORS
With a hundred and fifteen styles and seven-hundred and thirty separate items listed in the Coors catalog you may be sure to find the porcelain item you need. From a crucible holding less than 1 ml. and only 1 cm. in diameter to an evaporating dish containing 3612 liters and 25 inches in diameter you can select a size and shape to exactly suit your purpose. Since Coors Porcelain first came on the American market in 1915 the widest variety and highest quality chemical and scientific porcelain has been continuously available from Coors, without fail. You, the chemist and scientist, have seen fit to select Coors as the major source of laboratory porcelain for COORS PORCELAIN COMPANY over forty years. GOLDEN, COLORADO For further information, circle number 51 A-1 on Readers' Service Card, page 69 A
CARL
ZEISS
The Famous ABBE REFRACTOMETER
Incorporates t h e following features : • Range of measurements: n D 1.3 to nD 1.71 and sugar percentage scale 0% to 95%. For liquids and solids by 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 at a relaxed posture. • Border line of total reflection and scales are observed simultaneously in telescope.
M A D E IN WEST G E R M A N Y
• Measuring prism in heating mount can be easily interchanged. • All movable parts are fully protected by being entirely enclosed within the housing.
Write for free detailed
literature.
• Special index prism in heating mount available for measurements up to nD 1.85 (on special order only). • For highest-accuracy-measurements, an Ultra-Thermostat with different constancy of temperature ±0.005° is available as an accessory.
CARL
ZEISS,
INC.
GUARANTEED UNINTERRUPTED REPAIR SERVICE
4 8 5 F I F T H A V E N U E , N E W Y O R K 17, Ν. Υ. For further information, circle number 51 A-2 on Readers' Service Card, page 69 A VOL. 3 0 , N O . 7 , JULY 1 9 5 8
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51
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