Ordinary mercury-in-glass Fahrenheit thermometer
Ordinary mercury-in-glass Fahrenheit thermometer, with white plastic support, by G. H. Zeal Ltd. of London. Met ref.1077, Met O numbered 10/56, NPL 56, dated 1956. Scale -30 to 130 degrees
Ordinary mercury-in-glass Fahrenheit thermometer, with white plastic support, by G. H. Zeal Ltd. of London. Met ref.1077, Met O numbered 10/56 and 11/56, NPL 56, dated 1956. Scale -30 to 130 degrees
Ordinary mercury-in-glass Fahrenheit thermometer, with white plastic support, by G. H. Zeal Ltd. of London. Met ref.1077, Met O numbered 10/56, NPL 56, dated 1956. Scale -30 to 130 degrees
Ordinary mercury-in-glass Fahrenheit thermometer, with white plastic support, by G. H. Zeal Ltd. of London. Met ref.1077, Met O numbered 11/56, NPL 56, dated 1956. Scale -30 to 130 degrees