Hi there, Martyn,
A good few years ago, I sold a Specto 'Analytic' 16 mm projector to a collector who lived somewhere near Corsham, Wiltshire. He had two hobbies (and a very indulgent wife! ). One hobby was to collect one of every Specto projector, the other to collect one of every communications receiver made by the Hallicrafters Corporation of the USA.
I wonder where his collections are now?!?!
You probably know but I'll state for the interest of other readers: the Specto 'Analytic' projector could be set to project at 16 fps, 2 fps or still. When the last setting was selected, I seem to remember the lamp brighness was reduced.
Best regards,
Swarf, Mostly!