battery-operated en
51Henry Head Battery — The Henry Head Battery is located on the northern side of the entrance to Botany Bay at Henry Head, La Perouse, New South Wales, Australia. [ [http://home.st.net.au/ dunn/bunkers/laperousebattery.htm La Perouse Battery, Sydney, NSW ] ]… …
52stamp battery — noun a series of stamps operated in one mortar for crushing ores • Syn: ↑battery • Hypernyms: ↑stamp mill, ↑stamping mill • Part Meronyms: ↑stamp, ↑pestle * * * noun …
53Voice operated switch — In telecommunications, a voice operated switch, also known as VOX or Voice Operated eXchange, is a switch that operates when sound over a certain threshold is detected. [cite book |title=Newton s Telecom Dictionary |last=Newton |first=Harry… …
54mains-operated — /ˈmeɪnz ɒpəreɪtəd/ (say maynz opuhraytuhd) adjective (of an electrical device) operating with power drawn from the mains rather than from a battery …
55BOB — Battery Operated Boyfriend …
56Vacuum tube — This article is about the electronic device. For experiments in an evacuated pipe, see free fall. For the transport system, see pneumatic tube. Modern vacuum tubes, mostly miniature style In electronics, a vacuum tube, electron tube (in North… …
57Lego train — is a theme in the Lego Group products. The sets include locomotives, tracks, rolling stock, trackside buildings (such as stations, signal houses, etc). History The history of Lego trains can be divided in four distinct eras. The blue era (1966… …
58Pentagrid converter — For other types of frequency converters please, see Frequency converter. The pentagrid converter is a radio receiving valve (vacuum tube) with five grids used as the frequency mixer stage of a superheterodyne radio receiver. Grids of a 12SA7GT… …
59Ignition system — For other uses, see Ignition system (disambiguation). An ignition system is a system for igniting a fuel air mixture. Ignition systems are well known in the field of internal combustion engines such as those used in petrol (gasoline) engines used …
60Fuel cell — For other uses, see Fuel cell (disambiguation). Demonstration model of a direct methanol fuel cell. The actual fuel cell stack is the layered cube shape in the center of the image A fuel cell is a device that converts the chemical energy from a… …
