A slide rule for electrical engineers

摘要

381,395. Slide - rules. GARDNER, L. F., 173, Fleet Street, London.-(Faber Castell-Bleistift-Fabrik Akt.-Ges., A. W. ; Stein, near Nuremberg, Germany.) Dec. 4, 1931, No. 33656. [Class 106 (i).] For use in determining electrical resistances of copper conductors at various temperatures the slide is provided with a subsidiary scale of temperatures as shown at T.