Tjetv £quifr*He*tt For further information o n any i t e m m e n t i o n e d here, fill out c o u p o n o n p . 3 8 2 6 ·
Scaler One of the advantages of the 100 Sealer, developed b y Tracerlab, is the fact that it is based ou the scale of ten rather than the scale of two, so that it is possible t o read the results directly without any interpolation from the horizontal register and the t w o columns of indicator lights. It uses two Tracerlab Decaseale plugin units which are based on four cascaded scales of two with two feedback loops to provide a scale of ten. There are two vertical rows of ten neon bulbs each on the instrument panel, to which the Decascales are connected. The Decascales also have four indicator lights mounted on them, which are not visible when the instrument case is closed and which show directly the counting position of each scale of two. A still further step in the development of the plug-in feature is a replaceable discriminator input circuit. This unit is shielded to minimize the pickup of spurious counts in the scaler from switches and relays.
New Technical Processes call for
y SPECIAL MATERIALS
FLORIDIN PRODUCTS ENTER MANY EXACTING USES S p e c i a l l y prepared forms of Fullers Earth and Bauxite-based Adsorbents of varied properties are offered by Floridirt for m a n y requirements o f adsorption—dehydration—catalysis—décolora* tion. Extensive research has b e e n carried o n for m a n y yesrs. Your i n q u i r y is invited·
FLORIDIN COMPANY ADSORBENTS Dept
3822
B. 220 LIBERTY ST.. V
The instrument is provided with a 4-inch high-voltage meter. There are two high-voltage controls, one coarse and one fine. The coarse control allows a continuously variable adjustment of the Geiger tube voltage from 350 to 2,200 volts. The range of the fine controls is 0 to 200 volts. Provisions are made for connecting an electrical stop clock so that the time required for the reception of impulses may be accurately measured. When the electrical timer is connected to the instrument, it is automatically controlled by the reset-stop-start switch on the front panel. κ ι
Microscope A ills Cancer
Development Research
A development in microscopes, de scribed as an important aid to cancer research as well as for other scientific purposes, has been revealed by Alva H . Bennett, director of American Optical Co.'s Stamford, Conn., research labora tories. T h e development, the work of Arthur J. Kavanagh, AO research physicist, consists of a newly designed reflecting system or objective. With additional specially designed optical parts, it may be used on any standard microscope stand, to give a new reflecting system that can use both the visible and in visible regions of the spectrum, par ticularly ultraviolet and infrared. T h e reflecting system of microscopy. Mr. Bennett pointed out. uses mirrors instead of lenses to "soo" its specimens. Advantage of the reflecting type is that all wave lengths of Ihe spectrum are brought into the same focus. Plans t o manufacture the new objec tives are being made by American Op tical Co.'s instrument division. Experi mental samples are now in use at M I T and Columbia University. For cancer research, the new reflecting objective can use visible light, or, with suitable recording equipment, ultraviolet or infrared, for the location and iden tification of carcinogenic chemicals in the tissues and cells of the body and to show the earliest changes, both chemical and structural, when a tumor first begins to form. Other vital chemicals, such as the nucleic acids found in the chromo somes that are concerned with the de termination of heredity, proteins, and so forth may also be measured and analyzed. With it, scientists can use the visible and invisible infrared and ultraviolet rays for spectral analysis and identifi cation of chemicals. B y measuring the
CHEMICAL
infrared or ultraviolet radiations trans mitted or absorbed b y the microscopic details within cells, otherwise invisible unknown materials m a y be identified or studied. Another advantage of the re flecting objective is a much longer work ing distance from the specimen under study than standard refracting objectives. Κ 2
Strain
Recorder
A new strip-chart strain recorder for use in stress analysis with SR-4 bonded resistance wire strain gages has been announced b y the Baldwin Locomotive Works. Features* of the new recorder are easy readability with a 9.5-inch wide chart scale, two chart speeds of 6 and 180 inches per hour, and accommoda tions for a two-arm and four-arm strain bridge. Slowly varying strains can be recorded for as long as 10 days without changing the chart. The instrument is a special adapta tion of the Leeds & Northrup Speedomax type G, model S recorder with simple adjustments for strain gage characteristics, strain ranges, and for the Wheatstone bridge circuit. Basically the circuit is a d.o. potentiometer type for measuring the output of a strain liage bridge. A d.(\ power supply is built into the recorder and a voltage regulator is supplied separately. An important feature of the circuit is the arrangement for directly stand ardizing the potentiometer range in pro portion to the voltage supplied to the strain gage bridge. T h e standardization (calibration) is maintained automatically at predetermined short time intervals by the Leeds «fc Xorthrup standardiza tion circuit. This means of maintaining calibration en η also be actuated manu ally, κ 3
Filter
Press
A tilting-type filter press has been developed b y T. Shriver & Co., Inc., t o permit filtration with the filtering sur faces in a horizontal position and also to allow cleaning with the plates and frames in the usual vertical position. This unit offers the advantages of horizontal-plate filtration, where filter aids and cake constituents may flow evenly t o deposit a uniform cake over the filter surface which will not be dis turbed should the flow of feed be cut oft* at any time. Intermittent filtration does not disturb the filter-aid precoat, or the filter cake proper. On this unit, a worm and worm wheel readily tilt the press by the turning of a crank handle. E4
Radiation
Pyrometer
The development of a new radiation pyrometer, known as the Pyrovisor, has been announced by the Bristol Co. T h e instrument is designed for indicating.
AND
ENGINEERING
NEWS
recording, or controlling temperatures up to 4,000° F. in furnaces and kilns. The radiation unit, which is the tem perature-sensitive head, is mounted on the outside of the furnace or kilns, away from the hot zone, and picks up radiant energy emitted from the surface of the object under measurement. In this way, actual surface temperature measure ments of the work are obtained, rather than the usual furnace atmosphere tem peratures. Rapid response is claimed as the outstanding feature of the Pyrovisor, which is said to produce a 99% response to a temperature change within one second. Ε5
Gas
Flowmeter
A variable-area gas flowmeter known as the Floguide has been developed by the Fischer & Porter Co. The tapered precision-bore metering tube and the float are fabricated from stainless steel. The extension below the metering tube carries the metering scale, and an indi cator below the float permits direct reading of flow rate. The Floguide is available in capacities ranging from 45 to 16,000 standard cubic feet of carbon dioxide per hour and comparable ca pacities for other gases. Ε6
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Bronze Gate Valves A line of 200-lb. union bonnet, bronze gate valves has been introduced by the Ohio Injector Co. to include 30 different items. This series carries a rated working pressure of 200 lb. steam at 550° F.— 400 lb. water, oil, and gas nonshock. These valves are available in the solid wedge rising stem, double disk, rising stem, or solid wedge nonrising stem de sign, all having tapered seats and wedges. The valves are recommended for any service where bronze valves are applicable. Ε7
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Hydraulic Test Equipment
INDOPOL
£ Nf
2& *
Reg. U S. Pot. Off.
A hydraulic test fixture for mounting on bench for checking hose assemblies, piping, tubing, gages, valves, and cyl inders has been designed and built by J. N. Fauver Co., Inc. The equipment consists of a low pres sure pump for quick filling of equip ment being tested from a reservoir that holds approximately 3 gal. When the low pressure gage shows 100 p-s.i., the high pressure pump is actuated up to 5,000 p.s.i. Higher pressure units are available if required. Ε8
Polybutenes
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Pressure and Vacuum Control Designed for automatic pressure and vacuum control in the laboratory, pilot plant, and industry, the Cartesian manoVOLUME
2 7, N O .
51
» DECEMBER
I N D O I L CHEMICAL C O M P A N Y 910 SOUTH MICHIGAN AVENUE · CHICAGO 80, ILLINOIS 19,
1949
3823
IS EW
EQUIPMENT penetrate. Automatic controls prevent internal pressures from building up above 30 ρ .si. All radiators are tested for pressures t o 140 p-si. A flat-operated switch shuts off cur rent if, through neglect, t h e water level should drop below float level. This is positive protection for t h e Calrod i m mersion-type heating element which must be always fully immersed. As a final measure of protection a mechanical relief valve operates auto matically if a pressure of 30 lb. p.s.i. is reached. Ε 10
stat has recently been introduced b y t h e Emil Greiner C o . Based on the principle of the Carte sian diver, this new munostat elimi nates t h e use of complicated electrical and mechanical systems. Simple to operate and foolproof in design, t h e Cartesian manostat maintains vacuum setting even after shutting down t h e system. It is available in all-stainless steel or stainless steel with plastic body tube. Ε 9
Explosionproof
Radiator
Safety Valves on Propane Tanks
The development of self-contained heating units for use where explosive industrial atmospheres are a hazard, has been announced by the Burnham Corp. An explosionproof electric radiator developed b y this company has recently been approved by Underwriters' Labo ratories, Inc., for use with safety in class I, group D atmospheres: vaporized petroleum products, butane, alcohol, acetane, and natural g a s ; class II, group F and G atmospheres: carbon black, coal, coke, flour, starch, and grain dusts. All electrical switches and connections are sealed i n h e a v y cast iron housings strong enough t o contain a flash, if, b y some chance, explosive gasses should
Propane is claimed t o be handled with safety in cylinders and tanks equipped with safety relief valves manu factured b y the Weatherhead Co. T h e Weatherhead cylinder valves equipped with safety relief valves use a specially designed nit rile rubber valve seat, made from Hycar, which has been approved for use on cylinders up t o 150-ib. pro pane capacity. The major problem in the manufac ture of safety relief valves was t o o b tain a suitable rubber-base compound for the valve seat that would not stick
Late
Cost·
to metal. I n many cases, some rubbers would actually vulcanize t o t h e valve seat, causing excessively high relief pressures. This problem was eliminated with the use of a compound made b y the Acushnet Process Co., from Hycar American rubber, a product of B. F. Goodrich Chemical Co. Ε 11
Portable
Manometer
Weighing only 3.75 lb. and provided with bubble level and universal ball and socket-type clamp for mounting to meter piping, a portable field manometer has been announced by the Martin Instru ment Co. The scale of the unit is graduated in inches of water pressure, using mercury, calibrated dry. T h e range is from 0 to 110 inches of water. A valve at instru ment well and fitting at top of indicatting tube prevent loss of mercury when manometer is transported. Κ 12
Filtering
Equipment
The Hank C o . has announced the introduction of the Berlthimble, which can be used in place of a Gooch crucible, sintered glass filter, standard sieve, Soxhlet thimble, or stemless funnel with or without suction. Made of an alloy resistant t o strong oxidizing agents, acids, alkalies, heat, cold, and pressure, it is designed for use with wire mesh, paper, porous porcelin, sheet asbestos, felt, and cloth filters. Ε 13
Register Features Electrical Resetting
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