The back is hinged for convenience. Hold camera so back does not drop or hinge may be sprung. The empty film spool must be in the upper film compartment. Pull out the winding knob, giving it a quarter turn to secure it in the out position.
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Holder Electric - Greenville SC - Products in stock with average quantity on hand
He had spent some time in the air force and was working as a commercial photographer. He warmly recommended not bothering to carry any heavy lighting equipment but merely replacing all the lightbulbs with flash bulbs for interior shots. Since IIRC flashbulbs were designed for a trigger voltage of between three and V, they fired extra well when British current V was applied - invariably all the fuses in the lighting circuits would blow. The lecturer's advice was accordingly to keep all equipment close to hand so that as rapid as possible an exit could be made after a picture had been taken. The Argus flash unit accepts a type of bulb that I would call the standard bayonet-style press bulb. These can be recognized by being about the size and shape of a small egg and having a metal base that is smooth-sided except for two short pins which protrude near the bottom.