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Search Entire Site: Brooklyn Historical Society, Lead industry
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[Lead Batches] Lead batches. [Handwritten on verso] |
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[Machinery used to receive leads] Grooves to receive leads--Eight grooves at a time, half-lead deep, are cut on an exacting machine rumnning 9000 revolutions per minute and accurate to 1/1000 of an inch. (Please credit: Eberhard... |
