Calling Card Introduces Salesmanâ€”and Product (Aug, 1939)
Calling Card Introduces Salesmanâ€”and Product
Calling cards made of metal introduce salesmen for a new zinc-alloy product to prospective customers. Paper-thin, each card bears on the reverse side data on the composition and properties of the metal, while the card itself illustrates the precision that is now attainable in zinc-alloy die casting. A pressure of 4,800 pounds to the square inch is required to raise the lettering on both sides of the card, as shown in the illustrations at the left. Intricate technical difficulties have heretofore made the pressure casting of such a thin product impractical.