Engineers study the internal structure of the metal casting and find defects at the X-ray laboratory in the United States.
United States USA Date:1948 Duration:3 min 27 sec Sound:Yes
Railroad research and railroad network in the United States. Worker works on springs for smoother rides. He studies and tests metals and parts. Rubber gloves are immersed and water and checked. Worker undergo a goggle test. Engineer checks metals for defects using electric current. Engineers study the internal structure of the metal casting and find defects at the X-ray laboratory. Locomotive moves on track. Animated map depicts: the network of railroads spread over various countries in America.
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