Complet· wtth attachments
HELLER
'90
ELECTRONIC CONTROLLED
F.O.B. lai Vegas
LAB MIXER
Tomorrows tubing
DO YOU NEED TUBING FOR GAS CHROMATOGRAPHY? stainless steel or 3 0 % Cupro Nickel t h a t has a highly desirable ID surface a n d size unif o r m i t y t o receive a wide variety of coatings
CONSTANT TORQUE
t h a t is u n b r e a k a b l e a n d resists corrosion a n d high p r o c e s s i n g t e m p e r a t u r e s a n d is available in s t r a i g h t or l o n g coiled lengths?
STEPLESS VARIABLE DC SPEEDS FROM AC LINES) • Thyratron tubes on the Heller GT-21 controller supply demanded current by converting power i n stepless variation to the direct current motor. Assures constant torQue a s mixes become either
viscous o r fluid. Variable, reversible motor has direct a n d gear drive. Armature shaft speed, 0-5000 rpm. Gear shaft 18:1 ratio. Chuck, s h a f t s , 3 - s t e p p u l l e y included.
Order from your Laboratory Supply Dealer or write—
GERALD K. HELLER CO. 2(73 South Western Street
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technology—today
U s Vegas, Nevada
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THEN WRITE FOR BULLETIN 110 A n d if you need t u b i n g f o r o t h e r p u r p o s e s , we can h e l p y o u , t o o . We p r o d u c e m o r e t h a n 120 analyses in sizes f r o m .010 t o 5 /a i n . OD. Superior T u b e C o m p a n y , 2 5 0 4 G e r m a n t o w n A v e n u e , N o r r i s t o w n , Pa.
SuperiorTube(ST) NORRISTOWN, West Coast:
Pacific
PA.
Tube Company,
^*"^^
Los Angeles,
California
P. 0 . Box 4426 Circle No. 79 on Readers' Service Card
Circle No. 117 on Readers' Service Card
TESTMATIC BALANCE Exctfmcjly Mew! For fast repetitive weighing the Testmatic Balance is a leader in its field. The superb performance of this remarkable balance was created by the world's finest Swiss craftsmen. Check it over feature by feature and you will see why. • Direct optical readout with 1000 divisions on the scale. • Easy to read scale divisions 2.5 mm apart. • Scale is in direct line of sight with the pan. • The Testmatic is priced surprisingly low. MODEL TYPE
T-1
T-10
T-100
Optical Scale in
» Write for further information. Dealer inquiries invited.
Grams
0-1 g .
0-10 g.
0-100 g.
Scale Divisions
1-mg
10-mg
100-m g
Legibility with Vernier Weighing Time
0.1-mg 8-Sec.
1-mg 10-mg 3-5 Sec. 2-3 Sec.
C.H. STOELTING CO.
IMMEDIATE DELIVERY
DOPA-2, 3-H3 lodoacetam ide-1 -C14 Dopamine-/?-H3 6-Methylthiopurine-methyl-C 14
Ask for catalog of complete line of TRACERLAB RADIOACTIVE CHEMICALS. For personalized service call TWinbrook. 4-6600 or write Tracerlab, 1601 Trapelo Rd., Waltham 54, Mass.
Tracerlabinc. A DIVISION OF LABORATORY FOR ELECTRONICS, INC
Analytical Balances, Micro-Manipulators, Stereotaxic Instruments, Strip Chart Recorders, Polygraphs, Research Microscopes, Kymographs
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424 NORTH HOMAN AVENUE, CHICAGO 24, ILL. Circle No. 156 on Readers' Service Card I 7 8A
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ANALYTICAL CHEMISTRY
Circle No. 215 on Readers' Service Card
