September 1, 2008

WRITING ON FILM MADE EASY WITH ELECTRIC PENCIL (Jun, 1934)

Filed under: General — @ 9:22 pm
Source: Popular Mechanics ( More articles from this issue )
Issue: Jun, 1934
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WRITING ON FILM MADE EASY WITH ELECTRIC PENCIL

Writing on film or photograph negatives is made easy by using an electric pencil which can be operated by a flash-light battery or by using a transformer. The current heats the crayon which does the writing and makes it easy to form the characters which cannot be wiped away as is the case with some forms of writing.

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September 1, 2008

WRITING ON FILM MADE EASY WITH ELECTRIC PENCIL (Jun, 1934)

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