Detector measures mercury-vapor concentrations as low as one part in billion parte οί air with reasonable accuracy. It operates on 115-volt, 60-cycle power supply, draws air through cylindrical absorption chamber containing ultraviolet lamp and pnolotube

CATALYSTS FOR POLYMEKIZATiONS DRYING ACCELERATORS · OXIDATIOM AGENTS · BLEACHIMG AOEMTS

LUCIDOL (BENZOYL PSKQX3DE)

LUPERCO (PEROXIDE COMPOUNDS)

ALPEROX C (TECHNÎCAI lAUSOYl PSROXIDi)

LUPEROX (PEROX5DE PASTES)

Special Organic Peroxides

Acetyl Benzoyl Peroxide, e tc

J

Electronic Mercury-Vapor Detector

An electronic detector for instantaneously detecting the presence of mercury-vapor con­centrations in the atmosphere is announced by the special products division of General Electric Co., Schenectady, New York. I t is designed particularly for use in the glass, chemical, smelting, metal-mining, and elec­tric apparatus manufacturing fields where mercury-vapor concentrations -must he kept below the toxic limit—1.2 parts of iuctcury vapor in 100,000,000 par ts of air by volume, for continual breathing—to safeguard the health of employees. The detector will measure directly mercury-vapor concentra­tions as high as one par t in 3,000,000 par ts of air by volume and as low as one part in 200,-000,000 parts, with an accuracy of approxi­mately 5 % . Set a t its highest point of sensi­tivity, the detector is also capable of measur­ing with reasonable accuracy concentrations as low as one par t in a billion. In addition, it will detect mercury if it is carried by a gas­eous medium whose spectral absorption band does no t overlie the 2.537 Angstrom wave length.

Operating on 115-volt, 60-cycle power sup­ply, the detector draws air from the atmos­phere a t the rate of 0.25 to 0.5 cubic foot per minute through a cylindrical absorption chamber within the instrument. This cham­ber contains an ultraviolet lamp and a photo­tube. Normally, the lighted ultraviolet lamp permits normal current to flow through the phototube, bu t the presence of mercury, vapor in the air drawn into the absorption chamber intercepts and scatters the ultra­violet light, thus reducing the phototube cur­rent. By means of a bridge circuit, this drop in the phototube current is translated into an upscale reading on the indicating instrument of the detector.

Drying Oven

A standard box-type oven for the high­speed evaporation and drying of highly vola· tile solvents has been developed by the In­dustrial Oven Engineering Co., 11621 Detroit Ave., Cleveland. I t is a self-contained unît , with all heating equipment and ductwork built into the oven shell, and is shipped either ready t o operate, or in prefabricated sections for assembly at the point of operation. These ovens can be used for alcohol, acetone, naph­thas, methyl ethyl ketone, and many other highly volatile solvents, and can also be con­verted without delay for other types of drying, finishing, heat treating, or heat proc­essing where materials can be handled in trays, jigs, or baskets. I t is especially suited to dense loads where air stream resistance is high.

Plastic Blind Rivet

A plastic blind rivet permitting one-man operation and blind fastening is announced by the plastic developrr >nt division of the Vic­tory Manufacturing Co., 1105 Fai r Oaks Ave., South Pasadena, Calif. Its design la based on a wedging action and takes full advantage of the flow characteristic of plsstio materials under pressure. They are molded as one piece consisting of a head with plug

290 C H E M I C A L A N D E N G I N E E R I N G N E W S

NEW Equipment

O R G A N I C PEROXIDES

* KEGÎSTERED TBADEMAftltf

attached by a thin breakaway section and a tapered shank split to form four tapered fingers. The shank and head are hollow to the same diameter as the plug. It is applied by pressing the tapered fingers into a drilled hole. Taper on the outside diameter of the fingers reduces the inside diameter of the shank, the rivet and work being held in place

Paint Pumps

by the resulting pressure. Impact from the rivet gun, which may be manual or air oper­ated, instantaneously shears the plug and drives it into the plastic shank until the plug is flush with both ends of the rivet. Exten­sive tests have shown "Des-Rivets" to be superior to other fastening devices in many applications with metal, wood, and plastic components. A variety of shapes and sizes are available. The translucent properties of many of the plastics offer the possibility of combining improved functional value with decorative effect.

Matched Casters (or Industrial Trucks

A line of matched casters is being produced by Market Forge Co., Everett 49, Mass., which will do heavy industrial service where loads are up to one ton per caster. The swivel model uses formed steel parts in its construction, all machined of high-grade steel. The most radical departure from usual caster design is the absence of a king pin. Instead, the large-diameter ball­bearing swivel serves as both a thrust and radial bearing. The upper and lower ball races are of the same diameter. The lower balls carry no load reaction, as the center of the load wheel lies within the ball circle. The under balls therefore carry the entire static lead and every ball carries its share at all times. They run in accurately-machined raceways. The lower balls absorb the reac­tion of forces at right angles to wheel travel and normally are very lightly loaded.

Automatic Vacuum An automatic vacuum for steam is being

marketed by Leiman Bros., Inc., 117-78 Christie St., Newark 5, N. J. This auto­matic unit operates only when steam tefuses to heat one or more radiators. It is simple in construction and operation and may be fitted to any steam heating plant. It is olaimed to earn its cost very quickly in com­fort supplied and in fuel saved by making full use of all fuel burned.

An Alemite Versatal material pump, used by the U. S. Navy for applying a secret anti-fouling paint on ship bottoms, is termed one of the war's greatest naval discoveries. Until recently a rigidly controlled item, these pumps are now available for civilian opera­tions,· according to the industrial Alemite di­vision of S te wart-Warner Corp., Chicago. They present a radical departure from the conventional type of "pressure pot" spray apparatus. They are designed to dispense and apply paints, lacquer, mastic, sealers, insulating materials, fiber and cement coat­ings, and caulking compounds. Versatal pumps operate on air power, and from one to eiχ operators may work simultaneous!v, using as many different spray heads and material lines from a single pump.

Electronic Heater A heater for use in metal-working plants

which incorporates all of the important fea­ture? of the 5- and 15-kw. units and is also capable of heat-treating much larger parts, and in less time, has been made available by the industrial heating division of the General Electric Co., Schenectady, N. Y. The opera­tion of the heater is said to be unusually easy. Parts are positioned in the fixture, the start button is pressed, and automatic controls then regulate the heating and quenching cycles, assuring duplication of results on each part. An attached work table provides two heating positions, permitting full utilization of the high-frequency power supply to secure maximum production.

This ketose sugar9 from which Ascorbic Ac id is made9 is n o w readily available as pure crystals. Write for bulletins and prices on this and other products listed below»

Also © ADENYLIC ACSn»

L A B O R A T O R I E S , I n c .

IS

This low cost ceramic boat was developed especially for high temperature alloy com­bustions up to 2300° F. Because of the low cost of this Sargent boat, it is economical for Ofte-time use. However, its composition such that it can be used repeatedly.

It is slag resistant . . . it has a high melting point preventing fusion to tube . . . it retains its original shape when subjected to high tern· peratures . . . it has exceptionally high me­chanical strength . . . it has a thick base which prevents penetration of sample . . . its broad base makes the boat very stable. The large inside area of the boat and its smooth surfaces permit the sample to flow freely and form a thin, uniform layer.

The boat is precisely shaped by die form-Write for Sample

B. H. SARGENT & COMPANY, 155-165 E. Superior Street, Chicago 11, Illinois Michigan Division,' 1959 Ease Jefferson, Detroit 7, Michigan

ing, having perfectly straight sides» smooth, flat bottom and excellent dimensional uni· formity. The perforated handle facilitates in· sertion and removal of boat from tube. The end opposite the handle has a large, flat, per· pendicular surface so that the boat can be pushed into or out of the tube without danger of upsetting the boat.

Inside width, 5/16 inch; inside length. 3-1/4 inches; iaside depth, 3/16 inch; total width, 1/2 inch; total length, 3-7/8 inches; total depth, 3/8 inch. The boat fits combus­tion tubes as small as 3/4 inch in diameter.

S-21850 COMBUSTION BOAT—Ceramic Hlah Temperature, Sergent.

Per 100 boats. .$ 4.S0 Per 1000 boats 35.O0

V O L U M E 2 3, N O . 3 » . F E B R U A R Y 1 4 , 1 9 4 5 291

I-SORROSE

202 East 44th~Str«»t, ,fc*'*JYark 1 7, N.Y.

S A R G E N T