GYROTORY SHAKER A powerful, m a i n t e n a n c e - f r e e , rofary action s h a k e r , precision-built to p r o v i d e gentle to v i g o r o u s a g i t a t i o n for s u s t a i n e d periods.
Beta reference source set
CALIBRATED BETA REFERENCE SOURCES T h e triple, eccentric-shaft-drive system distributes a 1" rotary motion uniformly to every flask on the shaking platform. Smooth, quiet, cool-running. A t turn of a knob changes speeds mechanically, from 14r) to 400 r.p.m. Interchangeable platforms hold a large variety of glassware. Modifications gladly made to meet in dividual requirements. ONE-YEAR UNCONDITIONAL GUARANTEE Write for Bulletin
Technical bulletin with complete source information and specifications available on r e q u e s t .
G10-A49
NEW BRUNSWICK SCIENTIFIC C O . P R E C I S I O N
P.
O.
SOX
L A B O R A T O R Y
406
·
NEW
A P P A R A T U S
««UHSWICK,
N.
J.
Circle No. 152 on Readers' Service Card
iMUEiiJ
Five reference sources (Carbon-14, Cobalt-60, Thallium-204, Bismuth-210, Protoactinium-234 — plus spare mounts and copper planchers), with maximum energies from 0.1SS to 2.32 Mev cover the energy spectrum range of most beta emitting radioisotopes. Ideal for use as check sources for testing counting equipment or as cal ibrated sources for determining millicurie strength of unknown samples having higher energy betas. Accuracy of calibration esti mated to be within 10%. Sources contain between .01 and 1.0 microcuries. C-14 and H-3 standard reference source compounds also available.
ELECTRONIC CONTROLLED
I *.!=•.Μ Μ =ΓΠ
new
england
nuclear
575 ALBANY STREET,
corp.
®
BOSTON 18.
SALES REPS: A t o m i c A s s o c i a t e s , I n c . , P a c k a r d I n s t r u m e n t S a l e s C o r p . , Radionics, Ltd., ( M o n t r e a l ) . Circle No. 141 on Readers' Service Card
LOW COST PUMP for Laboratory Use • Pumps Liquids, Gases, Slurries
PROVIDES:
• CONSTANT TORQUE • VARIABLE DC SPEEDS FROM AC LINES
• No stuffing boxes • No shaft seals • No check valves • Non contaminating
Complete with attachments F.O.B. Las Vegas
$90
• Thyratron tubes on the Heller GT-21 controller sup ply demanded current by converting power in stepless variation to the direct cur rent motor. Assures con stant torque as mixes become either viscous or fluid. Vari able, reversible motor has direct and gear drive. Arma ture shaft speed, 0-5000 rpm. Gear shaft 18:1 ratio. Chuck, shafts, 3-step pulley included.
Order from your Laboratory Supply Dealer or write—
G E R A L D K. H E L L E R C O . 1 8 1 9 Industrial Road
Las V e g a s , N e v a d a
Circle No. 128 on Readers 1 Service Card
102 A
·
ANAfYTICAl CHEMISTRY
The New11Kinetic
CIMp"Pump
O p e r a t e s b y t h e a c t i o n of r a d i a l a r m s s u c c e s s i v e l y p r e s s i n g o n a l o o p of f l e x i b l e t u b i n g . T h e m e c h a n i s m c l a m p s o n e a r m a g a i n s t the tubing while the next a r m descends to clamping position. Previous clamping a r m then raises to permit tubing to a s s u m e its n o r m a l s h a p e a n d a g a i n fill w i t h l i q u i d b e i n g m o v e d . S t a n d a r d t y p e s of l a b o r a t o r y t u b i n g in a w i d e r a n g e of m a t e r i a l s p r o v i d e a p u m p i n g m e m b e r for a l m o s t a n y liquid, slurry or g a s . Tubing can be c h a n g e d quickly eliminating n e c e s s i t y of c l e a n i n g p u m p . T h e r e is n o d a n g e r of c o r r o s i o n or contamination. Pumps can b e furnished with motor or for driving from l a b o r a t o r y s t i r r i n g m o t o r . W r i t e for l i t e r a t u r e a n d p r i c e s .
SIGMAMOTOR, 4 7 N. Main Street
·
INC.
Middleport, Ν. Υ.
Circle No. 9G on Readers' Service Card
