50, 100 & 150 Years Ago: July 2022

Fri, 01 Jul 2022 06:00:00 GMT
Scientific American - Technology

Count women as workers; cement from sewage

"Edwin H. Land, founder of the Polaroid Corporation, gave the first extensive account of his firm's newest system of photography at a recent meeting. Under the title 'Absolute One-Step Photography,' Land demonstrated the new camera and color film that Polaroid expects to place on the market later this year. The new system, Land said, is a compact, automatic camera capable of making a succession of color photographs virtually as fast as the photographer can push the button. The camera weighs 26 ounces and when folded for carrying is roughly the size of a 400-page paperback book."

"For many years the bugbear of clock-makers has been the main-spring. Spring tension and driving power are greater when the spring is tight than when it is partly run down; regulation to insure running at a uniform rate is the most difficult part of clock-making. A new clock, now on the market after some six years of development, has done away with the main-spring. The driving force is electric, and comes from a battery guaranteed to run for a year. The reason is mainly that current is used intermittently. At each tick of the clock the circuit is closed, and the current flows for an extremely short interval of time; during by far the larger part of each second no 'juice' is used."

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