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A rare Marie-Day Actinometer made by Negretti & Zambra made in 1957, M2158, consisting of a mahogany base with two mercury thermometers enclosed within glass tubes both with serial numbers and original NPL certificates, 20-200 F
UNSOLD
A rare Marie-Day Actinometer made by Negretti & Zambra made in 1957, M2158, consisting of a mahogany base with two mercury thermometers enclosed within glass tubes both with serial numbers and original NPL certificates, 20-200 F
UNSOLD