SCIENTIFIC INDUSTRIES
DO YOU NEED
ULTRA-BURET
CRYSTALS? The following
quality
tals
available
are now immediate
crys for
delivery:
Sodium Iodide (thallium activated) Sodium Chloride (optical) Potassium Bromide (optical) A N E W INSTRUMENT THAT GIVES Y O U . . . • PRECISE C O N T R O L O V E R U L T R A MICRO QUANTITIES — M a r k i n g s t o .001 m l . ; c a n b e r e a d t o .0001 m l . β HIGH CAPACITY—up t o 7 m l . w i t h o u t refilling. Ultra-micro and macro. • EASY R E A D I N G O N C A L I B R A T E D WHEEL — N o m e n i s c u s ; s i m p l e r e s e t to zero to start each t i t r a t i o n . • I N S T A N T SPEED A D J U S T M E N T — Perfect c o n t r o l w i t h o u t use of valves or stopcocks. Just t u r n the wheel. T a k e A d v a n t a g e of our 3 0 D a y Test in y o u r L a b o r a t o r y Ask your Laboratory Supply Dealer for particulars . . . or write for Descriptive Bulletin!
Anthracene N e w Improved Economical Plastic Phosphor
SCIENTIFIC INDUSTRIES, INC. 13 Park Street
A n Efficient Ruggedized Alpha Detector
Dept.A-l
CRYSTALS, INC.
123 Woodland Avenue, Westwood, New Jersey
Springfield 3, Mais.
Circle No. 75-1 on Readers' Service Card, page 89 A
Circle No. 75-2 on Readers' Service Card, page 89 A
_CARiT^j
The Famous
ZEISS I
ABBE REFRACTOMETER
Incorporates t h e following features : • Range of measurements : n D 1.3 to n D 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 I N WEST
• Measuring prism in heating mount can be easily interchanged.
GERMANY
• All movable parts are fully protected by being entirely enclosed within the housing. Write for free detailed
• Special index prism in heating mount available for measurements up to n D 1.85 (on special order only).
literature.
• For highest-accuracy measurements, an Ultra-Thermostat with different constancy of temperature ±0.005° is available as an accessory. GUARANTEED UNINTERRUPTED REPAIR SERVICE
CARL ZEISS, INC. 4 8 5 F I F T H A V E N U E , N E W Y O R K 1 7 , Ν . Υ, For further information, circle number 75-3 on Readers' Service Card, page 89 A VOL.
3 1 , N O . 1 , JANUARY
1959
•
75
A
