GOGGLES

PARR INSTRUMENT CO. MOLINE, ILLINOIS. CONTRIBUTED ARTICLES. Polarographic Determination of Titanium in Tan talum and Niobium Concentrates and ...
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GROW AEROBIC AND ANAEROBIC CULTURES IN THE

GYROTORY®

INCUBATOR SHAKER A controlled temperature incubator with continuous shaking action. Agitation speed variable from 140 to 400 rpm. Triple-eccentric-shaft stabilizing system dis­ tributes positive rotary motion to every flask on the 18" χ 30" platform. Cool, quiet, smooth-running. , . ' M O D E L G25. C ι rculating heated air, the fully insulated unit provides constant tem­ perature, ambiient to 60° C , ± V 2 ° C Other speed r a n g e s , and connections for gassing avail­ able. Adapt­ able for tubes, bottles, and other glassware. Overall Dimensions:

2 5 " long χ 4 1 " wide χ 2 9 V i " deep.

UNCONDITIONAL O N E YEAR WARRANTY

CONTRIBUTED ARTICLES Polarographic Determination of Titanium in Tan­ talum and Niobium Concentrates and Ores . . .

1 836

D. K. Banerjee, C. C. Budke, and F. D. Miller

Polarographic Determination of rV,N'-Ethylenediglycine and Nitrilotriacetic Acid in (Ethylenedinitrilo)tetracetic Acid R. B. LeBlanc

1 840

Direct Quantitative Diffractometric Analysis . . . .

1842

P. P. Williams

Determination of Blood Urea with p-Dimethylaminobenzaldehyde H.H.Brown

1844

Extraction and Determination of Thorium from Sulfate and Phosphate Solutions with Tri-n-octylphosphine Oxide

W . J. Ross and J. C. White

1847

Determination and Stabilization of Reduced Ascorbic Acid in Extracts from Plant Materials . Η. Τ. Freebairn

1 850

Ion Exchange Membranes in Coulometry

1 852

Write for Catalog G 2 5 - A 1 1

NEW BRUNSWICK SCIENTIFIC CO., INC. P R E C I S I O N

L A B O R A T O R Y

A P P A R A T U S

P.O. BOX 6 0 6 , NEW BRUNSWICK, NEW JERSEY Circle No. 159 on Readers' Service Card

PARR

S. W . Feldberg and C. E. Bricker

Glassblowers'

GOGGLES

Determination of Organic Nitro Compounds by Controlled-Potential Coulometry J. M. Kruse

1854

Application of Constant Current Potentiometry to Nonaqueous Titrations of Weak Acids

1857

Irving Shain and G . R. Svoboda

Determination of p-Phenylenedilithium by Potentiometric Titration with Cerium(IV) Nitrate Solution. .

1860

A . F. Clifford and R. R. Olsen

2,4,6-Tripyridyl-s-triazine as Reagent for Iron. Determination of Iron in Limestone, Silicates, and Refractories

1862

P. F. Collins, Harvey Diehl, and G. F. Smith

FOR: Glassblowing and

other

tasks obscured a

by

dazzling

yellow

flame

The selective f i l t e r i n g lenses in PARR Glassblowers' G o g ­ gles block out the objection­ able y e l l o w glare always present in g l a s s w o r k i n g oper­ ations. They transmit o n l y a trace of y e l l o w light w i t h o u t seriously reducing the inten­ sity of red a n d other colors in the visible spectrum. A v a i l ­ a b l e in l i g h t w e i g h t safety f r a m e s , also in a clip-on style, each complete w i t h case.

Zirconium Analysis by Production Control Quantometer

C. L. Easlerday

1 867

Amperometric Determination of Tin with Cupferron

1868

S. S. Y a m a m u r a , J. E. Rein, and G . L. Booman

lodometric Method for Determination of Persulfates

1 870

Nagi W a h b a , M . F. El Asmar, and M . M . El Sadr

Determination of Chlorine Dioxide in Treated Surface Waters

M . A . Post and W . A . Moore

1 872

Order from any Parr Dealer, or write direct for Spec. 4200.

Direct Karl Fischer Determination of Water in Vinyl Ethers

P A R R INSTRUMENT CO. MOLINE, ILLINOIS

Lucien Barnes, Jr., and M . S. Pawlak

Selected Triphenylmethane Dyes indicators in Glacial Acetic Acid O . W . Koiling and M c C . L. Smith

Circle No. 86 on Readers' Service Card 6 A



ANALYTICAL CHEMISTRY

as

1 875

Acid-Base 1876