NOW...
EQUIPMENT
QUICK, CLEAR READINGS ON BLACK-READING WHITE-BACK
MERCURY THERMOMETERS A l l t h e a d \ a n t a g c s of ' ury are now
combined
merwith
t h e c l e a r v i s i b i l i t y of b l a c k - o n w h i t e . O n new Q U I K S I T E t h e r nioineters you
can
reliable
temperature
without
the
take
confusing
fast,
readings reflec-
t i o n s n o r m a l l y associated w i t h mercury.
New phenolic impregnated bearings are long wearing, show n o signs of wear after operating for two weeks at 350° C. in the journal box on the test stand ORDINARY MERCURY THERMOMETER Silvery thread reflects confusing external images
QUIKSITE MERCURY THERMOMETER Sharp blackreading thread instantly visible.
With black-reading QUIKS I T E t h e i m a g e is c l e a r a n d s h a r p — b l a c k against white — n o reflections, n o g l a r e , n o e r r o r s . S e n d f o r C a t a l o g 19-A, d e s c r i b i n g h u n d r e d s of H-B precision instruments. 1I-B I n s t r u m e n t C o . 4301 N . A m e r i c a n S t . P h i l a d e l p h i a 40, P a . ANOTHER
FIRST!
QUIKSITE BLACK-READING MERCURY THERMOMETERS 46
C&EN
JAN.
12,
1959
Bearings N e e d N o Lube N e w bearings made of phenolic impregnated fabric operate without lubrication A NEW plastic impregnated bearing material, m a d e by Russell Mfg.. Middletown, Conn., shows promise of replacing metal bearings in a good many uses. Bearings made of the material, called Rnslon, are long wearing and don't need lubricating, according to Russell. To make t h e bearings, Russell starts out with fabric woven of Teflon and cotton yarns, immerses it in a solution of phenolic resin (Union Carbide Plastics' BLS-2680). The fabric is then dried in air at 180° F . and cut into shapes determined b y the particular bearing application. A heat-sensitive adhesive is used to bond the shape to a metal receptacle. Both fabric and holder then go to a
press where they are p u t under a pressure of 7 to 10 tons per sq. in. and a temperature of 340° F. This sets up the phenolic resin and flows the adhesive to bond the resin impregnated fabric to the metal bearing housing. The phenolic, says Union Carbide Plastics, is lightweight, resists heat up to 350° F., is dimensionally stable under most atmospheric conditions, and has a low coefficient of friction. In addition, the hearings made from the material resist acids and alkalies and are not subject to electrolysis or corrosion hy een developed by O'Brien Industrial E q u i p m e n t , S a n Francisco, Calif. The- unit is designed for either liquid-solid or solid-solid blending a n d is said to l>e able t o handle u p to 4 0 0 cubic feet o f feed p e r hour ( 1 0 tons of a material with bulk density of 50 pounds per- cubic f o o t ) . Major advantages of the Impingatron, according to developer E d w a r d D. O'Brien,, are low initial cost, low power requirements, small size for the throughput it gives, and t h e continuous flow that is- possible. T h e machine is especially good for blending small amounts of liquids with large amounts of solids uniformly, t h e company claims. Major markets, a s O'Brien sees them, are formulating agricultural chemicals, plastics, foodstuffs (both human a n d animal), a n d general dry blending jobs. O'Brien's Impingatron works on a rotating disk principle. Solids feed onto t h e ceaiter of a cupped disk rotating at abomt 900 r.p.m. They flow by centrifugal force out toward t h e edge of the disk. Liquids are directed through smsall-diaineter tubing—no nozzles needed—into a n annular trough around the center of t h e distributor (above the disk b u t spinning in the same d i r e c t i o n ) , are distributed over a wetted wall , radially" through holes, and finally off i i series of triangular tips. The liquids impinge on the spinning solids near t h e periphery of the cupped disk. T h e liqui
