MR. ASPINALL PARR has aimed at giving a description of all the leading electrical measuring instruments on the market, and he has carried out this object with a painstaking thoroughness worthy of a ...

IN his chairman's address to the Meter and Instrument Section of the Institution of Electrical Engineers (J. Inst. Elec. Eng., 89, Pt. 1, No. 13, January, 1942), W. Phillips surveys the design and ...