Ib7.2.29
A magnetometer for the measurement of the earth's vertical magnetic intensity in C.G.S. measure / by D.W. Dye ...
London : published by His Majesty's Stationery Office, 1929
p. 257-278, [1] leaf of plates : ill. ; 31 cm.
On cover at head of title: "National Physical Laboratory Collected researches, Vol. XXI, 1929, Paper XIII, pp. 255-278.".
Green paper publisher's wrappers.
England London.
B38241