Motion pictures, 1940-1949

by Library of Congress. Copyright Office

An Introduction to Vectors—Coplanar Concurrent Forces. © 1Jun45; MP366.

Principle of Moments. © 1Jun45; MP469.

Principles of Gearing—an Introduction. © 1Jun45; MP467.

ENGINEERING; heat treatment of steel. Audio Productions, Inc., c1945. 1 reel each. © Audio Productions, Inc.

1. Elements of Hardening. © 1Jun45; MP16181.

2. Elements of Tempering, Normalizing and Annealing. © 1Jun45; MP16182.

3. Elements of Surface Hardening. © 1Jun45; MP16183.

ENGINEERING; materials testing. Audio Productions, c1945. 1 reel, sd. © Audio Productions.

Tension Testing. © 1Mar45; MP15878.

ENGINEERING; metallurgy. Graphic Films, c1945. 1 reel each. © Graphic Films.