[emeritus]

The 1" x 1/4" fuse was a standard pre-war UK glass fuse size, designated by Bulgin as "short type", available in ratings from 150mA to 3A: extracts from the 1936-7 Bulgin catalogue attached. They were said to be "Abolutely fireproof" and to provide "Absolute safety from danger of fire". Bulgin used to do double-pole fused 2-pin 5A plugs and fused chassis sockets that took a pair of them (supplied with 1A fuses unless specified otherwise). I suppose the 1" glass fuse was discontinued in the UK post-war so they wouldn't get used in 13A plugs.