U.S. Philips Corporation

Johannes R Gelens

Bauke J Roelevink

Adrianus J Van Zon

Low-pressure mercury vapor discharge lamp comprising a, preferably folded, discharge tube located within a lamp envelope and having electrodes and an electric stabilization ballast, which is partly surrounded by a thin-walled lamp base, which is connected to the envelope. In the region of the connection between the lamp base and the lamp envelope there is a metal plate for cooling the ballast, this heat sink being at the same time a mounting plate for further components in the lamp such as a starter switch.

Low-pressure mercury vapor discharge lamp

A flashbulb unit comprising a housing, a plate-shaped support in the housing and an electrical circuit which is provided on the support and in which flashbulbs and break switches are incorporated. The unit comprises pushbuttons which are incorporated in a wall of the housing and which are arranged each opposite to a break switch and operate the break switch when being depressed.

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Terneuzen, Netherlands

Johannes R Gelens