Instrument for measuring fire damp in mines with six pairs of spare filaments and pamphlet by E.H.T. Liveing Esq. Instrument for measuring fire damp in mines
Instrument for measuring fire damp in mines with six pairs of spare filaments and pamphlet by E.H.T. Liveing Esq. Instrument for measuring fire damp in mines
Measuring instrument, made by Cambridge & Paul, 1923, London England. Cambridge & Paul measuring instrument 1923
Frequency and time measuring instrument type TSA3436 by Venner Electronics Limited, 1965 with cover Frequency and time measuring instrument type TSA3436 by Venner Electronics Limited 1956