NEW
EXPAND TO LOW LEVEL COUNTING
PRODUCTS
Laser O u t p u t
Calorimeters
Series 362 calorimeters are high-pre cision laser output measurement de vices. The calorimeters operate as fol lows: a copper cone collects the out put energy of the laser; next, a copper thermocouple measures the total tem perature increase of the cone, this in crease being analogous to the laser out put energy. Maser Optics, Inc., 89 Brighton Ave., Boston 34, Mass. 423
hot plate value
\
with a
Low Background Detector • choice of detector sizes • replaceable thin window
4
NOW greatly refined and UL
(lVt'OrZVz")
• low background materials used in construction
and
Anticoincidence Converter • solid state electronics • high voltage variable control • detector and guard logics
A New Anticoincidence System that: • operates in the geiger or proportional mode • expands present equipment into a low level counting system
T h e A 1 6 7 0 Davis-Southern high sensi tivity c a t h o d e ray polarograph w i l l determine reversible or irreversibly reduced ions down to 5 χ 1 0 - 8 Μ with normal operation, or 10 7 M when the high resolution derivative c i r c u i t s are used. A particular advantage of the c a t h o d e ray p o l a r o g r a p h is t h a t w h e n the " F o r w a r d " sweep direction (i.e. i n c r e a s e i n v o l t a g e ) is u s e d , b o t h ir reversible and reversible reactions can be f o l l o w e d ; t h e " R e v e r s e " s w e e p f a c i l i t y ( i . e . d e c r e a s e in v o l t a g e ) , how e v e r , p e r m i t s t h e s e t w o t y p e s o f reac t i o n t o be c l e a r l y d i s t i n g u i s h e d a n d t h e current peaks due to irreversible r e a c t i o n s m a y o f t e n be e l i m i n a t e d . Southern Analytical Limited, Frimley Road, Camberley, Surrey, England. 424
• reduces background counts to the lowest possible level
for specifications, write to:
ISOTOPES, INC. 123 W o o d l a n d Avenue, Westwood, N e w Jersey
Circle No. 12 on Readers' Service Card 136 A
·
ANALYTICAL CHEMISTRY
N o w e v e n f i n e r hot p l a f e p e r f o r m a n c e . . . Fast h e a t i n g . . . W i d e temperature range.
Close
stepless t h e r m o s t a t i c c o n t r o l f r o m 10e F above room temperature to 7 0 0 ° F . . . I m p r o v e d i n s u l a t i o n , baffles, and control unit
....
A t t r a c t i v e , e a s y - t o - r e a d a n d set control dial. Use this 6 " s q u a r e h o t p l a t e f o r a v a r i e t y of r o u t i n e a n d critical w o r k . . . . Stainless steel case is c o r r o s i o n resistant a n d s c i e n t i f i c a l l y
Strip IV*" detector backgrounds: AC, Shielded; 0.35 cpm AC, Unshielded; 6 cpm
THERMOLYNE TYPE A 1 9 0 0
Chart
Recorders
Electronic strip chart recorders pro vide as many as twelve separate rec ords with high and low alarm or con trol contacts for each measurement. The new ER Series provides a chart 7 1 / 8 inches wide for single or multiple temperatures, humidity, or millivolt measurements such as pH and oxida tion-reduction potential. The Foxboro Co., Foxboro, Mass. 425
v e n t i l a t e d f o r c o o l , safe o p e r a t i o n on table top or f i x t u r e . 115 ν AC
700 w
Write for literature and
$22.75 name
o f nearest dealer.
THERMOLYNE CORPORATION Dept. 478, 2555 Kerper Blvd., Dubuque, Iowa Circle No. 13 on Readers' Service Card
