Electrical measuring instruments : grand prize Louisiana Purchase Exposition, St. Louis, 1904 (1904)
Leeds and Northrup Company · leaf 32
s and may be connected inseries or parallel or in combinations of the two. All of the blocks areinsulated on independent pieces of hard rubber and the condenser seg-ments are thoroughly insulated inside of the box. THE LEEDS & NORTHRUP COMPANY 31 Self-induction Apparatus Our line of… … 5316 5316. Ayrton & Perrys Variable Standard of Self-induc-tion $125 00 As sliown ill the illustration this instrument consists of two coiUwound on sections of concentric >phcncal surfaces, the inside one ofwhich can be rotated with reference to the outside one. and thus theirco-efficient of…
