Winding fine quartz threads into springs, used in General Electric research laboratory to indicate differences in weight as little as 1-28,000th of an ounce. Photo at top shows a finished spring. Center, process of spinning, and, below, an expert supervising grinding process.

Digital Commonwealth — Boston Public Library

Winding fine quartz threads into springs, used in General Electric research laboratory to indicate differences in weight as little as 1-28,000th of an ounce. Photo at top shows a finished spring. Center, process of spinning, and, below, an expert supervising grinding process.

[ca. March 1938]

RightsCC0 — Public Domain

CollectionDigital Commonwealth — Boston Public Library

[Information from item housing] Laboratories: Misc. Photos

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