. Electronic apparatus for biological research . A2 Make Break (M) (B) Change-over (C) ^ B Slow release Slow operate High speed (Figures in box give resistance in ohms. Letter is relay designation. Figure after oblique stroke gives number of contacts.) Make-before- (K) break (Letter is relay designation. Figure is serial number of contact set.) Uniselectors Non-bridging wiper and bank contacts Figure Symbols used in relay circuits Same, but bridging Driving magnet Interrupter contacts are always drawn in the unoperated position; thus a 'make' contact is drawn open, and a 'break' contact c
. Electronic apparatus for biological research . A2 Make Break (M) (B) Change-over (C) ^ B Slow release Slow operate High speed (Figures in box give resistance in ohms. Letter is relay designation. Figure after oblique stroke gives number of contacts.) Make-before- (K) break (Letter is relay designation. Figure is serial number of contact set.) Uniselectors Non-bridging wiper and bank contacts Figure Symbols used in relay circuits Same, but bridging Driving magnet Interrupter contacts are always drawn in the unoperated position; thus a 'make' contact is drawn open, and a 'break' contact closed. In a complicated circuit the symbols for 'earth' and 'earthed battery' are used wherever a connection to one or other pole of the supply occurs (see Figure ); it is of course not thereby implied that as many batteries as symbols are provided. THE POST OFFICE 3000 TYPE RELAY General construction The components of a 3000 type relay are illustrated in Figure A soft iron yoke surrounds a detachable coil wound on an iron core. An L shaped armature rests on a knife-edge machined on the yoke, and is retained by 512
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
