Ν EW
Equipment Mushroom Technique for Enlarging Tanks
and 90. The units may be mounted b y means of a through-bolt. The Riteohm 8 2 has two lug terminals at one end firmly fastened by screws. The Riteohm 83 has radial wire leads. Both units are pie-wound to 1 % accuracy. Specially enameled alloy resistance wire i s noninductively pie-wound on a nonhygroscopic ceramic bobbin which has a hole through the center for a No. 6 screw. After being wound, the units are vacuum-impreg nated with a special varnish which provides additional insulation and thoroughly p r o tects the winding against humidity. T h e resistors can be supplied with a varnish coat ing containing a fungicidal agent, thus making the units particularly suited for use in the tropics.
Streamlined O v e n
Above. In only 1 0 days, petroleum storage tank of 3 0 0 , 0 0 0 galIons capacity (left) has been enlarged to 4 2 5 , 0 0 0 gallons and is back in service (right). Below. Intermediate construction stages show new rings in piece on the fifth day (left), and the raised tank welded to the new section, ready for painting and connection on the seventh day (right)
A method by which liquid storage tanks may be enlarged to as much as twice initial size without dismantling the original struc ture h a s been developed by Stacey Bros. Gas Construction Co., Cincinnati. The old tank i s literally boosted to new capacity height, a s new rings are added at the b a s e by a patented process which makes use of virtually a l l of the original structure in assembled form. Such re-use, with utiliza tion of the original foundation and minimum dislocation of connections, contributes t o the economy of the process as well as to the speed with which a job may be completed. Providing for t h e first time an alternative to new tank construction to increase storage capacity, the method will be particularly useful where facilities are crowded and there La room only for expansion upward. As much a s 100% additional capacity may be added, by cutting the existing tank shell at the base, adding new radial plates, and build ing a new shell around the old structure to give t h e desired height. Water is then run into t h e tank up to the new shell level, so that compressed air may be introduced to 3014
A streamlined, compact, and completely self-contained oven has been designed for laboratory and pilot-plant use by the Indus trial Oven Engineering Co., 11621 Detroit Ave., Cleveland 2, Ohio. Sizes of oven working space in the new oven range from 3 X 3 X 3 feet to 6 X 6 X 6 feet, in increments of 1 foot, and special sizes are furnished to specification. Temper atures range up to 900° F., with a guaranteed differential of =*=2°. This type of oven is usually furnished with electrical heating equipment, but is designed to use any type of fuel. In every case, the heating equip ment is contained within the oven shell. T h e smaller models are shipped assembled, ready to connect to the heat source. The oven is designed particularly for pre cision experimental work in drying, baking, evaporating, polymerizing, aging, and heat treating, especially in cases where highly volatile solvents are used. Regardless of t h e flammability or explosiveness of the solvents, the oven has insurance company approvalIt can be furnished with special construc tion to withstand corrosive fumes, and with exterior baked enamel finishes in a variety of colors to harmonize with surroundings. Au tomatic temperature controls are provided to suit the processes for which the oven i s to be used.
Portable Lubricator float the old cover shell up to the new level. Various controls hold the tank steady and level to Vie inch, while 4-inch filler plates are inserted between the shells, and the two units are tack-welded in place. When air pressure is released, and the water drained from the tank, the two shell sections and fillers are completely seal-welded on the outside. Inside, the old shell is trimmed and welded at intervals around its circumference, and the enlarged tank is ready for connections and service. Originally developed to obtain better buoyancy control of petroleum storage tanks in areas subject to flood, the new method can be used to build up tanks having either umbrella-type roofs, or roofs supported by center columns.
Precision Resistors Two new series of Riteohm precision re sistors, series 82 and 83, are announced by the Ohmite Manufacturing Co., Chicago. These are additions to the Ohmite precision resistor family which includes series 7 1 , 81, C H E M I C A L
Designed to provide a portable lubrication department for industrial plants, a new Lubrikart is announced by the Alemite di vision of the Stewart-Warner Corp., Chicago. It is mounted on 5-inch ball-bearing casters, is only 21 inches wide, 31 inches long, and 37.5 inches high. Pushed like a perambula tor, it is intended for one-man operation and is able to travel between rows of machines or else where in narrow space. One model carries two 7-gallon tanks equipped with low pressure pump; one 7-gallon tank with high-pressure pump; two 1.75-gallon tanks with oil transfer pumps; six spout-type oil cans, four levertype hand guns, and space for waste, replace ment fittings, and small tools. The second model has also a high-pressure hand-operated grease pump which holds 30 lb. of lubricant and a hose. Outstanding advantages of the Lubrikarts, according to Alemite engineers, are their ability to tramsport a variety of lubricants and equipment for application; high degree of maneuver ability; and time savings. A N D
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ing phases at all times. Only one air connection is required, which may be either with flexible air hose or rigid piping. Air motors are used for operating vises and fixtures, feeding work or tools, feeding milling machine tables, feeding surface grinder tables, opening and closing rubber or plastic molds, tube bending, metal forming or piercing, operating glass molds, setting dowel pins in wood working, and many other varied operations.
Visibility Safest on Home Front • Camouflage to conceal fighters and their equipment in battle zones has been raised to a science, but in factories producing war materiel, visibility is the much-desired goal, and engineers study to protect men and machines by revealing their presence and movements. Their efforts have been intensified as the speed of industrial operations has accelerated, as work periods have lengthened, and inexperienced men and women have been trained for factory work.
Prelubricated Sealed Ball Bearing A new feature in electric motor design, the prelubricated sealed ball bearing, has been applied by Westinghouse engineers to eliminate the necessity for greasing except at intervals of five years or longer. This new bearing consists of the standard single row of balls mounted in races of the same width as the double-row ball bearings. Metal shields are anchored solidly in the outer race near the outer edges and extend down and inward t o a close running clearance from the inner race. Adequate space for grease is thus provided and at the same time there are highly effective seals against the leakage of grease or the entrance of dirt. This construction gives several operating advantages: the tightly-sealed enclosure reduces oxidation of the grease, promoting longer grease life; maintenance expense is sharply reduced as frequent greasing is not required; grease is kept in and dirt is kept out; when motors are disassembled the bearings, being enclosed in a cartridge, are protected against dirt. Furthermore, the hazard of overgreasing and the consequent grease seepage into windings is eliminated. Lint-free induction motors incorporating this feature have been installed throughout the textile industry. They have operated from 3 to 6 years, running 24 hours per day at higher room temperatures and at higher humidity than is encountered : n most industrial applications. None showed any signs of wear and t h e grease was in good condition ; all were reinstalled with the recommendation that they be run for another three-year period before being relubricated.
A simple but effective method for increasing visibility of mobile equipment uses contrasting color combinations of stripes or bars. Bundles and boxes of carton paper are tiered, and stripes and bars are painted on to fleets of these trucks as an additional safety measure. Luminous paint has been applied in some instances to trucks used in dim light and hazy atmospheres. To promote safe use of all power industrial trucks. The Elwell-Parker Electric Co. t Cleveland, has published a list of 34 explanatory rules, developed from actual experiences. Copies may be obtained by writing to that company.
A i r Motor A new air motor is being introduced by the Bellows Co., Akron 10, Ohio. The BM10 is said to develop more than twice the piston thrust force of the standard B M 5 motor on a given air line pressure (10.32 against 4.9 times the operating air line pressure). Bellows air motors are small, compact, powerful air-driven reciprocating power units. They
Electrical Spy Locates Fungi A new use has been found by the armed forces for black light, filtered ultraviolet rays. According to the Hanovia Chemical and Manufacturing Co., Newark, N. J., t h e Inspectolite lamp has been found useful for the location of fungus deposits on material after use in the tropics. When communication apparatus, such as radio transmitters, is brought back for defungicizing and needed repairs, it is impossible for the eye to locate areas of infection, which menace health as well as impair function of the apparatus. It has been found that the organism will fluoresce and glow brightly when exposed to the filtered ultraviolet rays. Physicians previously had noted that in dermatologic diagnosis the light was effective in detecting fungus infection of the scalp. Infected hairs take on a bright, luminous pale-green color. Other important applications of the lamp include the detection of counterfeit ration stamps, the search by censors for hidden messages, chemical and metallurgical analysis.
operate on any air line pressure up to 175 lb., and differ from conventional air cylinder design in that the valve and all operating controls are integral with the cylinder, permitting full and positive control over all operatV O L U M E
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JUNE
10,
1945
NewText 1015
