In this video an old Ferranti FDb and a Ferranti FD are connected up to a 4 Ampères test load.<br />These meters are rated at 2½ Amps for 230 Volts 50 Hz.<br />Vintage would be from the early 1920's.<br />These meters were used on 750 Watt controlled hotwater loads<br />ex Whangarei, Northland, NZ.<br />These meters were given to me by a Nortpower inspector about 15 years ago<br /><br />I created this video with the YouTube Video Editor (http://www.youtube.com/editor)