Lister perimeter, by Hamblin, London, c. 1930 Lister perimeter, by Hamblin, London, c. 1930 1925-1935
Perimeter, McHardy's type with spare candles and chart, by Curry and Paxton, London, 1885-1930 Perimeter, McHardy's type with spare candles and chart 1885-1930
Chin support from perimeter, aluminium and vulcanite, probably British, 1930-1950 Chin support from perimeter 1930-1950
Perimeter, by Rayner, 100 New Bond Street, London, England, 1901-1970. Perimeter, by Rayner 1901-1970