W. M. Welch Scientific Company

Revised data on ·. ·. ·. ATOMIC AND NUCLEAR PHYSICS. SYNTHETIC RUBBER. NATURAL LOGARITHMS. VISCOSITY. VITAMINS. Continuing the policy of ...
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ANALYTICAL

BE UP-TO-DATE IN

'48

.

CHEMISTRY

. . WITH

The 30th Edition Handbook oi Chemistry & Physics A TRULY UP-TO-DATE REFERENCE VOLUME S l N C E its first edition in 1913, the Handbook of Chemistry and Physics has evolved from a small book, less than one-half inch thick, to a volume of 2704 pages. For over 35 years, this volume has been the most convenient source of accurate and complete data for those dealing in the scientific professions. The scope of the Handbook of Chemistry and Physics is comprehensive, the nomenclature is international, and the information is strictly authoritative.

Revised data on · · · ATOMIC AND NUCLEAR PHYSICS SYNTHETIC RUBBER NATURAL LOGARITHMS VISCOSITY VITAMINS

Continuing the policy of constant revision, followed consistently since the first edition, this present volume includes a total of one hundred and forty pages of completely revised material.

The Chemical Rubber Co. DEPT. M

2 3 1 0 SUPERIOR AVENUE CLEVELAND 14, O H I O

$6.00 PER COPY (50c extra outside the U. S. A . )

20 MICROAMP METERS — NEW D . C . PANEL METERS — DESIGNED

ADOPTED

especially for the atomic bomb laboratories.

by research and production as one of the most sturdy, sensitive and dependable meters.

USED in the war's most startling electronic developments.

SENSITIVE - RUGGED M O D E L NO. 350

OTHER MODELS AND RANGES ARE AVAILABLE WRITE FOR OUR METER CATALOG.

W. M. W e l c h S c i e n t i f i c

Company

1515 Sedgwick St., Dept. A, Established 1880 Chicago 10, Illinois, U.S.A.

Standard Equipment for many Radiation Devices, these Rugged, High Sensitivity Precision Instruments are the product of many years' experience in building Electrical Measuring Instruments.