Making rifle barrels that will shoot true and straight requires mathematical exactness. These expert workmen in an American factory that is turning out rifles and cartridges for our fighting men are making these rifle barrels accurately straight...
The rear gunner of the Martin bombers are also protected by Plexiglas enclosures which can be revolved mechanically to train multiple machine guns at planes attacking from the rear. Resembling the dome of an astronomical observatory the enclosure...
How fast a lacquer or finish will dry is determined by the use of plate glass discs coated with the material to be tested and revolved slowly while a thin trickle of sand falls on them from a cone shaped container. It has been found by DuPont...
The micro balance, shown here in the Chemical Department's Analytical Laboratory at DuPont's Experimental Station is one of the essential tools of modern chemistry, which demands a high degree of measuring accuracy. The human hair eight inches...
Caption: "Motor driven shaker screens accurately determine the percentage of over-size and under-size in the samples taken from nine points on each car."
Written caption: "How Reading anthracite is screened. Exactly sized screens, operated by powerful electric motors, accurately separate the coal into eight classifications or sizes."
written on back of print: "Chrysler Exhibit N.Y. World's Fair 1939" typed note with print: "The Talking Car, one of the wonders that attracts thousands of visitors daily at the 5-Star show in the Chrysler Motors Exhibit Building at the New York...
