Ib7.2.30
The piezo-electric quartz resonator and its equivalent electrical circuit also improved cathode-ray tube method for the harmonic comparison of frequencies / by D.W. Dye ...
London : published by His Majesty's Stationery Office, 1929
p.147-215, [3] leaves of plates : ill. ; 31 cm.
On cover at head of title: "National Physical Laboratory Collected researches, Vol. XXI, 1929, Papers IX & X, pp. 145-215.".
Green paper publisher's wrappers.
England London.
B38242