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FULL OPTION DESCRIPTIONS / IMAGE GLOSSARY: [Option titles are also linked to proceed to the next step.] Bulb looks like the usual pear shaped household light bulb but has two extended inner leads extending the filaments into crumbled aluminum foil, strips of aluminum foil, or a tangled mass of aluminum threads (actually thin, wired aluminum foil) that occupy most of the space inside.
OPTION A: 580a – (Figure 581, thumbnail) “Bulb is filled with crumpled or shredded squares of extremely thin aluminum foil. Base is of screw type. This is a General Electric Photoflash lamp used as a camera flash (one time use only), of which there are many versions. These were first introduced in 1930 with the Photoflash No. 20.” (Go to A52 - Figure 581, Larger size.)
OPTION B: 580b – (Figure 582, thumbnail) “Bulb is filled with a mass of shiny cottony fibers of aluminum foil (actually wired aluminum). Base is of screw type. This is a later model of General Electric’s Photoflash bulb (the No. 22) used as a camera flash (one time use only), of which there were many versions. These were first introduced in 1939 with the No. 7 and No. 16 models.” (Go to A53 - Figure 582.) End.