1 candle power; pentane burner. Used as standard light source for sensitometer. Simmance standard lamp
10 candle power, pentane burner; calibrated control tap; rotating burner head with two blueglass filters. Used for sensitometry as standard light source. No 241. With certificate of measurement of accuracy. Dibdin Argand standard lamp 1898
Ceramic acetyline burner giving a cyclindrical flame, protected from draughts by cylindrical shield. In cylindrical lamphouse, on stand. Design proposed by Sheppard and Mees, as sub-standard light source, 1910. Acetylene standard lamp 1910-1920
Standard lamp with paper shade, unsigned, United Kingdom, 1941-1975. Used in lounge of volunteers' flat at the Common Cold Research Unit, Harvard Hospital, Harnham Down, Wiltshire, England. Standard lamp from Common Cold Research Unit volunteers' flat 1941-1975
