NEW PRODUCTS Heat loss is prevented by specially designed doors, which also allow free access t o the furnace chamber. All models are equipped with a n external blower connected t o a duct system to speed up the cooling cycle when neces sary. 10 High Input Impedance Amplifier Announced A new amplifier, designated Type 104, is now available from the Atlantic Research Corp. Designed for general laboratory applications where high input impedance and broad band re sponse is required, it is said to be especi ally useful for maintaining low frequency response and signal level of piezoelectric accelerometers, pressure pickups, and similar transducers. The company says the amplifier works well into oscillo scopes, tape recorders., and other meas urement equipment where t h e load impedance is greater than 5,000 ohms.
Nephelometry.. unties analytical knots Many difficult analytical problems a r e quickly solved by Coleman nephelometry without f i l t e r i n g , drying or weighing . . . •
Concentration of solids in dilute suspensions.
•
Clarity of liquids—whiskies and other beverages.
•
Sterility of clear liquids —parenterals and vitamins.
•
Growth rates of bacteria.
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Proteins in biological fluids.
Ask for 64 page manual, "Coleman Tools for Science"
COLEMAN
Coleman Nephelometers Dept. A. Coleman Instruments, Inc., Maywood, III, For further information, circle number 85 A-i on Readers' Service Card, page 77 A
Only MC&B packs under Argon Because of its compact design, t h e Type 104 is convenient for multichannel use. U p to 10 amplifiers will fit side by side in a special frame for rack mounting. 11
to a s s u r e h i g h e r p u r i t y T o m a i n t a i n t h e e x t r e m e p u r i t y of some organics i t is_necessary to package t h e m under a n inert atmosphere.
Pipet Pump
process consists of b l a n k e t i n g t h e c o n t a i n e r s a n d t h e m a t e r i a l
A novel pump introduced b y Micro Fine Instruments is designed to elimi nate use of lung power common in pipetting. T h e action of the new instrument is controlled by two rollers which pinch t h e rubber tube closed to form a seal. When the knob is turned, the pipet pump rolls up the tube. This causes a partial vacuum to form, thereby drawing the , liquid into t h e pipet. According to the company, t h e smooth action of rotating the knob gives delicate control of the amount of fluid in the
•
The MC&B
For further information, « · · coupon on page 77 A
to b e packaged with argon.
Before t h e bottles a r e r e m o v e d
from t h e a r g o n - b l a n k e t t h e y a r e sealed. than
air t h e compound
Since argon is heavier
remains protected.
p a c k s organics u n d e r a n i n e r t a t m o s p h e r e .
Only
MC&B
T h i s is a n o t h e r
reason w h y m a n y chemists specify M C & B w h e n t h e h i g h e s t p u r i t y is desired. Over 4000 chemicals from a single source.
Matheson Coleman&Bell Division of the Matheson Company, Inc. Norwood tCincinnati), Ohio; Bast Rutherford, N. J. For furtber information, circle number 85 A-2 on Readers' Servie· Card, paie 77 A
V O L . 2 9 , N O . Λ, APRIL 1 9 5 7 ·
8 5 A
