Motion pictures, 1940-1949

by Library of Congress. Copyright Office

2. Rotating Magnetic Fields. © 1Jul45; MP16348.

3. Squirrel-Cage Rotor Principles. © 1Jul45; MP16349.

4. Split-Phase Motor Principles. © 1Jun45; MP494.

5. Repulsion Motor Principles. © 1Jun45; MP491.

ELECTRICAL WORK; motor control. The Calvin Company, c1945. 1 reel each. © The Calvin Company.

1. Direct Current Controllers. © 1Aug45; MP95.

2. Across-the-Line Starters. © 1Aug45; MP96.

3. Reduced Voltage Starters. © 1Aug45; MP97.

4. Wound Rotor Controllers. © 1Aug45; MP98.

ELECTRICAL WORK; motor maintenance and repair. The Calvin Company, c1945. 1 reel each. © The Calvin Company.