Toronto. The magazine Science & Industry addressed the wide audience of tinkers and experimenters (mostly boys and youths) and as such it included a wide range of things. In this example article, a camera is shown, but unnamed. The take home was that it had an f/2 lens and could snap theatre and street scenes at night under the existing light in those environments.
The second article covers a unique projector. Again unnamed, this machine uses an “ordinary car headlight bulb” and a resistance to run on house current. Since such a bulb in 1925 took 6 volts and house current was 115 volts, the resistor would run quite hot. The bulb is like a point source illumination so the result would be a very contrasty light. Prints were photographed on movie film and each frame could be shown separately.
A rather tedious conversion to save the size and weight of a stereopticon projector. We had a more sophisticated projector (by SVC) when I was a kid that showed both slides and film strips like the film used in the 1925 projector. A thank you is in order for friend George Dunbar who offered this tidbit of photographic history.