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Operating parts of a Dorrco jet sizer. UnÉt shown is a 9α/2 pocket size

Low Cost Pocket Classifier Classifier has flexible poclcet arrangement; remov­

able water distribution pipes

A HINDERED settling hydraulic classi-" fier, developed by Dorr, eliminates expensive constriction plate construc­tion. Moreover, company claims unit, called Dorrco jet sizer, has unusual flexibility because of pocket arrange­ments. Classifier is for the sizing of solids eight mesh and finer. Design features of the Dorrco jet sizer result in more effective use of hydraulic \vater to produce clean, deslimed fractions sized within narrow limits.

Basically, the Dorrco jet sizer con­sists of a number of individual compart­ments or pockets which, with the excep­tion of the first half size pocket, are of equal area. Pockets may be situated singly in series or in transverse banks of two, three, or four abreast. Arrange­ment of compartments depends upon feed tonnage and desired number of products.

Water under hydraulic pressure is distributed from an elevated header through a system of vertical pipes to four horizontal pipes along bottom of each pocket. Water enters the compart­ments through a series of small nozzles in the horizontal pipes. Continuous discharge of sized particles is controlled by an automatic pneumatically oper­ated system consisting of a pressure control, motor, and valve mechanism.

In operation, minus eight mesh feed pulp enters first pocket where coarsest particles are scalped out. Here, upward velocity of the hydraulic water holds

parti«cles «of a narrow size range in sus­pension i m bottom of ttae compartment.

Fiaier ^material is classified out and overflows^ a submerged weir to the sec­ond jpockzet which operates a t a slightly reduced wvater velocity^

Saune hindered classification takes place agsin, and a second fraction is prodmeecfi. Similarly, each pocket yields a clossely graded product . Tbe fractions from two or more podcets abreast are comrDinecB, and in la rge units products of tvwo 0ΕΓ more banks oiay b e blended.

Particl-es not retained i n the last poclcet overflow t o waste or further treatment:. Excess water is carried off by la*und«ers along Both sides of the unit.

Je=t sizser is available with, any num­ber cof pockets from l1

J/2 to 21V 2 . Ε 1

Gage Connects Externally to Ch&mic*ol Tanks

Am automatic reading gage for ex­ternal connection to tanks, has been de­veloped by Liquidvision Gage & Con­trol. Co»mpany recommends gage for use on crhemical t anks , especially acids or allkalis that are s tored under pressure orvacuimm. Company says outstanding advantage of the gage is that it can be used on existing tanks Avithout necessity of cuttiung holes or other openings in the tanld itself.

dallecH. the Magnalnx, umit consists of a nommagnetic colïirnn that is con­nected tso the liquid a o d vapor space of

the tank. Within this column, a float is free to rise and fall. As the liquid in the tank changes in level, liquid flows through a connecting tube to the column and levels out in the column itself. The float, which has a magnet connected to it, follows this change in level and the field from the mag­net positions a roller on the outside of the nonmagnetic column. Roller is enclosed within a plastic raceway that is filled with an inert gas. Graduated scales are placed on each side of the raceway.

Company says there is no possibility of either liquid or vapor escaping from the tank as the tank seal is a solid metal wall of nonmagnetic material. Gage is entirely self-actuated. Ε 2

• Bellows type packless va lve , in hand operated or pneumatic-hydraulic mod­els, has been designed by Clifford Mfg. Valves are of all-metallic construction and are designed for pressures up to 150 lb./sq. in. and for temperature serv­ice from - 6 5 ° to 250° F . 1 3

ί Tempera ture control va lve , by Klip-fel Valves, is pilot operated for sensitive and also high pressure services. Valve

Microscope Has Control of Fine And Coarse Focusing in One Knob Leitz's inclined binocular microscope com­bines the coarse and fine focusing adjust­ments into one manipulating knob. ^ All control knobs are located in a low position for fatigue-free operations. High power 4 mm. and oil immersion 2 mm. lenses supplied with the microscope have built-in protection devices to prevent damage to front lenses. Microscope arm is of one piece light aluminum casting. Binocular body is fitted with quick change bayonet mount and may be positioned to face forward or reversed. Inclined monocular tube is also available Ε 4-

2720 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

DIFFUSION PIPES

tfyou make or use WOOD FINISHES · METAL LACQiUERS - PLASTIC FINISHES · PAPER LACQUERS

CLOTH FINISHES · MEL¥ COATINGS · HE#T SEALING ADHESIVES

**«*&- v*^..V - ^ ^ **«-*£ * i ^.J, * 4 ?>* >#>2»

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.you'// levant to know Λ/Ι about

Eastman's new fi/m former A LOW-VISCOSITY CELLULOSE ACETATE BUTYRATE FOR

FORMULATIONS REQUIRING HIGH NON-VOLATILE CONTENT The introduction of half—second butyrate has greatly broadened the usefulness of cellulose acetate butyrate in protective coatings.

Eastman's announced production of this low-viscosity film former brings you the outstanding advantages of cellulose acetate butyrate in a new form—a more soluble form—one that per­mits its use in formulations, requiring a high non­volatile content. The high solubility of half-second butyrate, plus its slow viscosity build-up in economical solvents sucli as toluene and ethyl alcohol, opens up entirely new fields to this unique cellulose polymer.

Half-second butyrate is a dry powder, safe to ship and easy to handle, ! # produces films of low color and high clarity vwîth excellent strength and flexibility at both nor-mal and low tempera­tures. Extremely stable in the presence of ultra­violet light, half-second butyrate films retain

their initial low color, high strength and flexibil­ity for long periods, indoors or out. No other easily sprayable film former exhibits these char­acteristics to such a high degree.

In addition, half-second butyrate films possess excellent abrasion resistance and are little affected by prolonged underwater immersion or rapid temperature changes.

Even if you are already familiar with the older cellulose acetate butyrate types, it will pay you to re-appraise its properties in the light of this new development. Samples of half-second butyrate and formulation suggestions are available on request.

C H E M I C A L P R O D U C T S , I N C . Kingsport, Tennessee

S U B S I D I A R Y OF E A S T M A N K O D A K C O M P A N Y

SALES OFFICES: Eastman Chemical Products, Inc., Kingsport, "Tenn,; New York—260 Madison Ave.; Framingham, Mass. — 65 Concord St.; Cincinnati—Carew Tower; Cleveland—-Terminal Tower BIdg.; Chicago—360 IM*. Michigan Ave.; St. Louis—Continental BIdg.; Houston—412 Main St. West Coast: Wilson Meyer Co·; San Francisco—333 Montgomery St.; Los Angeles*—48O0 District Blvd.; Portland—520 S. W. Sixth Ave.! Seattle—821 Second Ave.

V O L U M E 3 2, N O . 2 7 •JU LY 5, 1 9 5 4 2721

half-second butyrate

Eastman

EQUIPMENT. *

has a 50° F . range of adjustment. Standard ranges are : 25 to 75, "75 to 125, 125 to 175, 175 to 225, and 2 2 5 to 275 ( all in degrees F . ) Units are avail­able in sizes from 3 / 4 to 6 in. Sizes 2 in. and larger have semisteel bodies. Smaller sizes have bronze bodies. Stain­less valve trim is used on sizes 4 irm. and smaller. Larger sizes have bronzes trim as standard but can b e supplied with stainless trim. Ε 5 • Disk type power operated valves, by Ledeen Mfg., a re designed for actu­ating remotely located or automatically operated cylinders. Un'î-s are available in two and three positions and are built in sizes from 3 / 8 to 1V 4 in. staradard pipe connections. 16

• Vapor equivalent apparatus,» by Phillips Petroleum, is designed fo»r the determination of t he vapor equivalent and molecular weight of liquid resi­dues from natural gas samples bu-t can be applied to any liquid which lhas a vapor pressure of more than 4 τηκη. of mercury at the temperature of the vaporization bulb. Instrument con­sists of a vaporization bulb with a.n in­tegral multiplying manometer asid a removable sample entry system comsist-ing of an orifice and matching pycmom-eter. Apparatus measures vapor equiv­alent as gaseous milliliters per liquid milliliter and has a sensitivity off 1,5 ml. for each millimeter on the manom­eter scale. 17

• Radioact ive moni tor , model 1.619, by Nuclear Instrument & Chemical, is a monitor for use with a Geiger counter for: routine surveying for alpha, beta,

or gamma contamination in radioisotope laboratories, detecting large fluctuations in cosmic ray and other laboratory back­ground, and for routine measurements of radioactivity for medical diagnosis and treatment, tracer work or process control in industry. Inst rument pro­vides four ranges to cover any radiation intensity up to 20,000 counts per min­ute . A built-in loud speaker is provided for an additional indication of radioac­tivity. Ε 8

• W a t e r condit ioner , by Packard Mfg., is said to eliminate and prevent corro­sion and scale formation in boilefs and water systems. Unit is easily installed and has no moving parts, company says. Conditioner is available in sizes han­dling from 6.5 to 1760 gal . /min. for connection with corresponding standard iron p ipe ranging from 3 / 4 in. to 12 in. Ε 9

• Vacuum tube e l ec t rome te r , im­proved design, has been developed by Keithley Instruments. Designated model 210, instrument is a line-oper­ated d.c. vacuum tube voltmeter with a high input impedance. I npu t exceeds 101 4 ohms, grid current below 10~13

ampere, and drift within 10 mv. per hour. Five voltage ranges are provided: zero to 0.8, 2, 8, 20, and 80 volts in either polarity. Ε 10

• Axial flow ag i t a to r , by D . J. Murray Mfg., has antifriction pillow block bear­ing at both drive and impeller ends that reduces maintenance. Impeller and bearing are antifriction ballbearing, pre­packed, grease lubricated, housed in a

Sampler Draws Ai r Between Η of Surface and Relatively Cool One J. B. Ficklen's Konisampler obtains permanent dust records on glass. Unit employs theory of thermal precipitation. Konisampler consists of sampling head (right), electrical power and suction units <center), and electric timer. Gas passes through slit in upper portion of sampling luead, Adjacent to slit are two electrically heated wires. Unit is so arranged that eqiaal amounts of the gas pass under each wire and all the particulate matter is deposited on glass slide positioned between two blocks

E l l

cast iron casing filled with water repel­lent grease. Uni t does not require fresh water supply for lubrication. Designed for quick easy removal from stock chest, shaft and impeller assembly can b e re­moved without dismantling impeller from shaft. Impeller can b e removed from shaft while the assembly is within t he chest. Ε 12

• Granu la to r s , in a range of four sizes, have been developed b y Alsteele Engi­neering Works. Units are of steel con­struction, double supported, ruggedly mounted, hardened rotor, are dust type construction and easy to disassemble. First of the n e w line is 4.5 X 6 in. throat unit which is completely self contained in a 1.5 sq. ft. floorspace. Other models include 5 h p . with 5 X 10 in. throat opening, 25 hp . wi th 7 X 18 in. throat opening, and 40 hp . uni t with 9 X 24 in. throat opening. T h e small 4.5 X 6 in. unit is powered by 1.5 hp. motor. Ε 13

• Por tab le Bunsen bu rne r , using lique­fied petroleum gas in disposable tank and thereby eliminating need for gas piping, has been developed by Turner Brass Works. Unit is 5 7 / 8 in. high in operating position, has all brass burner, control valve and fittings, s tandard laboratory tripods, and hot plates. Ε 14

• Compact des iccator units for eco­nomical dehumidification of small parts are now being manufactured by Ap­plied Engineering Associates. Units can be shifted to various working loca­tions. Dehumidification is accom­plished at 6 X 10"5% relative humidity (dewpoint of —40° F.) at room tem­perature. Units are said to be especially suitable for conditioning metallic and nonmetallic parts prior to encapsulat­ing, finishing, and similar operations.

Ε 15

• Video vo l tme te r , by Millivac Instru­ment , has a sensitivity of 70 uV; its highest range —1 kv. Company says flat frequency response was made pos­sible by a combination of extremely heavy degrees of negative feedback and frequency selective circuitry in the feed­back path. Ε 16

• Alloy steel mudl ine va lves for 2000 lb . / sq . in., by Edward Valves, incorpo­rates designs used for company's 3000 lb . / sq . in. valves introduced to the oil drilling industry recently. Main dif­ferences are in the bodies and bonnets which are lighter and the handwheels which have only one crossarm. Ε 17

; >&tlW > χ fee > t * T^i -ψ t r#>sj £ί > ^ 4*φ4 For further information on any item mentioned here, see coupon

on page 2724

2722 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