1934 Print Johns-Manville Asphalt Sheet Cork Frigidaire Insulation Bourke FZ3 XGX3 Please note the small mark

Please note the small mark on the left

and performing various other duties

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The orange blemish that you see in this digital image is not on the original copy

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1934 Print Johns-Manville Asphalt Sheet Cork Frigidaire Insulation Bourke FZ3 XGX3 Please note the small markThis is an original 1934 halftone print of a layer of asbestos insulation at the Johns Manville Company. The caption writes, "Move the fibers along a revolving belt and with a saw toothed edge lift them off and keep them from piling up into a tangled mass. The rock wool contains millions of cells of dead air that supply its insulating property. Mixed with asphalt and pressed into sheets, it becomes rock cork, used in Frigidaire and other low