NEW PRODUCTS from a fraction of 1 megohm u p to 5000 megohms. T h e i n s t r u m e n t also can be supplied for different b a t t e r y voltages, different midscale values, a n d a n u m b e r of scale ranges. Greibach employs the principle of twin-wire suspension of a moving coil plus a spiral disk tensioning design whereby the bifilar wires will always r e t u r n t o perfect parallelism or zero position with no c u r r e n t flow. Through use of disk tensioning springs, t h e calibration and accuracy are p e r m a n e n t and the zero positioning never changes, according to the company. 10 P o l y e t h y l e n e Fittings a n d P i p e MODEL
MA2SS0
MODEL MA65 MODEL MA640
Ultramicrobalance
RUGGED · ACCURATE · TUBELESS
MAGNETIC AMPLIFIER DC SOURCES (MA-NOBATRONS*)
Sorensen MA-NOBATRONS* have been designed for industrial applications and unattended installations where the utmost in maintenance-free service is required. S
P
E
C
I
F
MODEL M A 6 5 INPUT
OUTPUT LOAD RANGE
RECOVERY TIME
I
C
A
T
I
O
N
S
MODEL M A 640
1 0 5 - 1 2 5 V A C , 1 0 , 6 0 cycles
190-230VAC, 3 0 . 6 0 cycles 4 - w i r e w y e .
4.5-7.7VDC, a d i .
23-32VDC. a d j .
0-5 amperes
0-40 amperes
0-50 amperes
±1.0%
A new ultramicrobalance for labora tory analysis and research work a t t h e micro and submicro scale has been an nounced by Microtech Services Co. T h e Model Ε has a fused silica beam supported by a torsion fiber attached to a calibration wheel accurate to one m i n u t e of arc. T h e reinforced beam design and new p a n s u p p o r t principle give g r e a t shock resistance a n d provide a high load safety factor, according t o t h e company.
MODEL M A 2850
6VDC, a d j . ± 1 0 %
REGULATION
T h e addition of two complete lines of polyethylene fittings, a line of threaded fittings and one of sleeve fittings, h a s been announced b y A r t h u r S. L a P i n e & Co. Each line includes elbow bends, short tees, swept tees, and swept bends. T h e threaded line also includes a half coupler with a male t h r e a d and a half coupler with a loose n u t . Polyethylene pipe l 3 /4 inches o.d. is furnished in lengths of 1 a n d 6 feet. All fittings and pipe are i y 2 inches i.d. and are interchangeable. 11
f o r a n y c o m b i n a t i o n o f line a n d l o a d conditions
0.15 seconds under w o r s t conditions
0.2 seconds under w o r s t conditions
0.5 seconds under w o r s t conditions
Contact your local Sorensen representative, or write for further information. If you have special requirements in magnetic amplifier DC sources, write or call the Appli cations Engineering Department, and your problem will receive prompt attention. SORENSEN & C O M P A N Y ,
INC.
3 7 5 FAIRFIELD A V E . , S T A M F O R D , C O N N .
•Reg. U.S. Pot. Off.
CONTROLLED
POWER
FOR
RESEARCH
S O R E N S E N
AND
Λ
For further information, circle number 62 A on Readers' Service Card, page 53 A
62 A
INDUSTRY
S t a n d a r d models h a v e a sensitivity of 0.1 or 0.01 microgram and a load capac i t y of 0.4 a n d 0.04 gram, respectively. Sensitivity u p to 0.001 microgram can be obtained on special order. Sensi tivity is c o n s t a n t over t h e entire load range. T h e weight of a sample can be determined in less t h a n 2 m i n u t e s after For further information, see coupon on page 53 A ANALYTICAL
CHEMISTRY
