Auto-alarm Selector, Radio-telegraph
Object IDM972.20.1 a-c
CategoryDistribution and Transportation Artifacts, Water Transportation- Accessory
Date Madecirca 1920
Materialsiron; glass; steel; brass
Place MadeLondon, England
- Radio-telegraph Auto-alarm Selector: Metal box, glass on top and instruments below glass. Plate on front inscribed, "Marconi Auto-alarm Selector, Type 333, P. S. No. 2106A, INST. No. 13167, Marconi's wireless telegraph Co. Ltd. London." On the front are nine bolts and screw plate inscribed, "No. 1 Bell. No. 2 & 3 Bells, +, 24V, -, 1 Input 2, In. V. Relay 2." Three holes with turnable bolts inside which can be turned with the key available, inscribed on holes, left to right, "Dash Relay, Signal Relay, Space Relay." Between the three holes are two plates inscribed, "Bridge Bell Key, Test Key." the top of the instrument is held on by eight metal bolts with round heads.
- Key: 8 cm length, width 4.7 cm. Dual hollowed out head, attached to a hollow bar. Key fits into "Relay Holes." Inscribed on key, "Made in England, 2."