NEW
PRODUCTS
THERMOLYNE
measures .002 microvolts!
KEITHLEY MILLIMICROVOLTMETER T h e Keithley Model 149 is t h e m o s t sensitive electronic v o l t m e t e r avail able today, having a signal-to-noise ratio t h a t a p p r o a c h e s t h e t h e o r e t i c a l limit. R e c o m m e n d e d f o r u s e with t h e r m o c o u p l e s or t h e r m o p i l e s , t h e Model 149 is also ideal in cryogenics investigations and Hall Effect studies. Zero s u p p r e s s i o n u p t o 100 t i m e s full scale adds versatility for t h e user. L i n e - o p e r a t e d , t h e M o d e l 149 can a c c o m m o d a t e either a float i n g or g r o u n d - r e f e r e n c e d i n p u t . O u t p u t is 5 ν or 5 m a on all ranges. Brief s p e c i f i c a t i o n s :
The Model 2 2 - 0 2 Triple ADC, multi parameter analysis system, will con vert experimental data t o computer language. The three channels pro vide 3 pulse amplifiers, 3 analog t o digital converters giving up t o one part in a 1 0 0 0 (or 1024) resolution, t r i p l e 0.5-μ, second coincidence shap ing circuits, 3 6 b i t register for " o n e event" buffer storage and binarycoded-decimal data format. Radia tion Instrument Development Labora tory, 4 5 0 1 West North Ave., Melrose Park, III. 409
Pyrolyzate
• - i finest lipwrtj hot plate value
NOW greatly refined and
Spectra
The infrared spectra of 500 com mercial materials have been prepared by examination of pyrolysis products. Included are selected polymers, rub bers, elastomers, and related ma terials. Each spectrum is labeled with commercial name, manufacturer, in strument used, Sadtler serial number, and other technical information. Sadtler Research Laboratories, Inc., 1517 Vine St., Philadelphia 2, Pa. 4 1 0
THERMOLYNE TYPE A 1 9 0 0 N o w e v e n f i n e r hot plate per f o r m a n c e . . . Fast h e a t i n g . . .
• range: 0.1 microvolt to 100 millivolts in 13 overlapping l x and 3x steps • noise: less than 6 χ 10-'° ν rms with shorted input J input impedance: 10K ohms on 0.1 μν range rising to 10 megohms on 100 μν scale stability: within 0.01 μν per hour speed of response: to 90% fs in .5 seconds on most ranges • accuracy: 2% fs on all ranges • price: $895.00
W i d e temperature range.
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Other MICROVOLTMETERS: Model 150A 1 μν sensitivity $750.00 Model 151 100 μν sensitivity $420.00
w o r k . . . . Stainless steel case is
stepless t h e r m o s t a t i c c o n t r o l f r o m 1 0 " F above room temperature to 7 0 0 D 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 o f r o u t i n e a n d critical 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 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 t o p or f i x t u r e .
full details in latest catalog ... 115 ν A C
KEITHLEY INSTRUMENTS 12415 Euclid Avenue · Cleveland 6, Ohio Circle No. 199 on Readers' Service Card 132 A
·
ANALYTICAL CHEMISTRY
The atmosphere controller shown adapts to most conventional instru ments to provide a gaseous at mosphere for the spectrographic analysis of metals. Angstrom, Inc., 2 4 5 4 West 3 8 t h St., Chicago 3 2 , III.
411
700 w
$22.75
Write f o r literature and name o f nearest
leader.
THERMOLYNE CORPORATION Dept. 478, 2555 Kerper Blvd., Dubuque, Iowa Circle No. 118 on Readers' Service Card
