NEW PRODUCTS cules, again producing changes in t h e ion current. P - E says t h e b e t a - r a y c a n detect in t h e range of 10~ 14 mole of sample in the carrier gas, a n d t h e flame detector is somewhat b e t t e r . Electrical response for b o t h is one millisecond. P-9 Crystals a r e n o t just a sideline at I S O M E T . Years of research a n d d e v e l o p m e n t h a v e e n a b l e d u s t o p r o d u c e consistently t h e highest quality crystals o b t a i n a b l e a n d a t attractive prices. W e g o all o u t t o serve y o u w i t h HIGHEST QUALITY ATTRACTIVE PRICES · PROMPT DELIVERY —three g o o d reasons w h y leading spectroscopists e v e r y w h e r e are t u r n i n g t o I S O M E T for their crystal n e e d s . W h y don't you t r y u s on your next order. N a C I , KBr, KCI, Kl, CsBr, Csl, BaF 2 , M g O Rough blanks, polished windows, prisms, special shapes. Standard liquid and gas cells; special cells. Repair and polishing service for cells and windows. KBr Pellet Powder. WRITE TODAY for price list and free Technical Bulletin No. 1576.
Analytical
Evaporator
T h e N - E v a p , offered b y Organomation Associates, enables simultaneous evaporation of solvent from six samples in 50-ml. Erlenmeyers, or 12 samples in 24-mm. m a x i m u m diameter test tubes. T h e basic assembly is a s u p p o r t stand, sample holder, gas manifold, and 12 gas injectors with individual needle valves. Heights of the gas injectors are individ ually adjustable, a n d a t h u m b screw
Isomet C O R P O R A T I O N
P.O. Box 34—Palisades Park, N. J. Circle No. 114 an Readers' Service Card
Eiecbothermal * HEATING TAPES Heat WHERE You Want It . . . WHEN You Want It! Electrothermal Heating Tapes consist of o n e o r m o r e f a b r i c b a n d s o f resistance w i r e , s e p a r a t e d or b o r d e r e d b y bands of high-tem p e r a t u r e - r e s i s t i n g glass f i b r e y a r n . The width a n d length o f t h e various t a p e s a r e c a r e f u l l y d e t e r m i n e d b y t h e currentcarrying capacity of the resistance w i r e . Tempera Length Width Watts ture o f 4 0 0 ° C a n d o v e r in at in c a n b e r e a c h e d inside a Ft. Inches 115 V. glass t u b e o f 2 mm w a l l 3 1 100 2'/> 250 4 thickness. 450 5 3 The t a p e is simply w o u n d 6 500 »'/> 36 2 '/• around the body to b e 72 4 h e a t e d , a n d h e l d in position 6 108 b y glass laces a t both ends. 8 144 72 2 1 A s u i t a b l e control d e v i c e such 144 4 1 as a " P o w e r - s t a t " o r v a r i a 1 216 6 1 8 b l e a u t o - t r a n s f o r m e r should 288 2 2 120 b e used with the t a p e s . 4 2 240 2 360 6 T H R E E TYPES A V A I L A B L E 8 2 480 UNINSULATED — INSULATED 2 210 3 · / . ON O N E S I D E — I N S U L A T E D 4 420 3'/. ON BOTH SIDES 6 630 3'/. 8 3'/» 840 DEALERS' INQUIRIES INVITED
'/> '/· '/«
Amps. 1.6 3.0 4.6 5.2 0.5 1.0 1.5 2.0 1.0 2.0 2.5 3.0 1.5 3.0 4.0 5.0 2.5 4.2 7.5 10.0
Un insulated Cat. I A65080 9.75 ea. 12.25" 16.75 * 19.25"
$
Insulated 1 Side Cat. M65090 $11.40 ea. 15.00" 20.25" 23.00 "
(Average load of Heating Tapes is 2 Ά Watts/Sq. In.)
STANDARD SCIENTIFIC Supply Corp.
808 B R O A D W A Y NEW YORK 3, N Y .
Circle No. 128 on Readers' Service Card 8 0
A
·
ANALYTICAL
CHEMISTRY
Insulated Both Sides Cat. #A65100 $11.90 ea. 18.75" 26.50" 29.50" 4.25" 6.70" 9.00" 13.90" 6.90" 12.50" 14.40" 17.25* 9.70" 15.00" 20.00" 30.00" 13.90" 21.00 " 29.50" 45.00"
I M O «ΑΤΟ»» APPARATUS KEAOENTS J AND I CHEMICALS I
permits t h e entire assembly t o be se cured a t a desired height. C o n s t a n t t e m p e r a t u r e evaporation is thermo statically controlled in a water b a t h a t any t e m p e r a t u r e from 35° t o 70° C. Utilities required a r e a d r y air or nitrogen source delivering u p t o 0.25 c.f.m., a n d a 120 volt a.c. source d e livering four amperes. P-10
Printing Analytical Balance An electronic i n s t r u m e n t which a u t o matically prints t h e weight of samples in a n analytical balance is offered b y W m . Ainsworth & Sons, Inc. T h e unit consists of a n Ainsworth Right-A-Weigh analytical balance, a n electronic unit, a n d a n 8-place printing-adding m a chine. T h e range covered is 200 grams to 0.0001 gram. T h e operator obtains a permanent record of weight printed on t a p e b y pressing a b u t t o n . Previous weight, t a r e weight, corrections for buoyancy
