Moving-iron voltmeter and ammeter (two movements) by the Record Electrical Co. Ltd.
1920
Moving-iron voltmeter
"Megger" moving-iron voltmeter
Moving iron voltmeter by Evershed & Vignoles
Moving-iron voltmeter
Moving-iron voltmeter serial no.B3945 made in England by Ferranti
1950-1974
Portable moving iron voltmeter
1925-1949
Portable moving iron voltmeter
1925-1949
Moving-iron a.c. recording voltmeter no.71159
1950-1969