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This main bus ammeter measured the current from the batteries like those used in Gemini 3, IV, and VI. Located on the Gemini pilot's panel, the No. 1 scale displayed main batteries 1 and 2 and the No. 2 scale displayed main batteries 3 and 4. Fuel cells replaced batteries on Gemini V and VII through XII. This ammeter did not fly in space. Weston Instruments made the artifact and NASA transferred it to NASM in 1972. Gauge, Ammeter, Main Bus, 1960s. Creators: Weston Instruments, Anne Weston. (KEYSTONE/HERITAGE IMAGES/HERITAGE ART)