film of sufficient thickness is deposited upon the stenciled design the filament is peeled off from the beeswax and the plutubago brushed off the back. Iron wires are used as conductors. The filament is incan desced in the atmosphere as it is practically non-com bustible or for security against breakage it may be incandesced in any suitable gas or in a vacuum., scientific american, 1890-08-11
film of sufficient thickness is deposited upon the stenciled design the filament is peeled off from the beeswax and the plutubago brushed off the back. Iron wires are used as conductors. The filament is incan desced in the atmosphere as it is practically non-com bustible or for security against breakage it may be incandesced in any suitable gas or in a vacuum., scientific american, 1890-08-11
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