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amateur amperes armature coils attached back bearing battery binding-screw Birmingham Wire Gauge bobbin boxwood brass brushes centre channel clamped cleaned commutator connected copper wire current electricity cylinder deflection direction disc drilled drum armature dynamo electricity electro-magnets extremity F.M. coils F.M. core fastened flange flow flywheel fretsaw front bearing galvanometer give holes inch in diameter inch thick inch wide inches long insulation iron cores laid lathe layers of wire leakage left-hand legs length limb machine magnet magnetise marked metal mode of winding needle north pole nuts opposite outer circuit Pacinotti paraffin paraffin wax passes pattern piece polarity polarity set pole-pieces portion position produced resistance revolutions per minute ring armature rotate round screws shaft shellac shown at Fig shunt shuttle side Siemens silk slot soft iron solder south pole tape terminal trunnion turn twisted twisted ends varnish winder wound