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