Resistors 5 decade set, Type ^85. Black top panel eith elector knobs and terminal posts mpunted on polished wood box. scientific instruments, j.l. williams instruments, resistance box, decade box

Used in Physics and Electrical Engineering laboratory experimentsPotentiometer, Type D-73-E in polished wood box with lift out circuit diagram inside the lid. Black top panel with terminal posts, switches and selector knobs.Black Dymon tape on lid "Ass.No. 50"scientific instrument, potentiometer, physics, electrical engineering, laboratory

D.C. Volt ratio box. 100 OHMS per volt. Black terminal post pane;, inside a polished box with hinged lid and leather carry handle. Serial Number: 3021scientific instrument, volt ratio box, physics, laboratory, electrical instrument, electrical engineering

Wheatstone Bridge, Type WBSRS, 4 Decade. Serial Number 3875. Black panel with terminal posts, selector knobs and switches in a polished wood box with lift-off lid. Circuit diagram photocopy inside the lid. scientific instruments, j.l. williams, wheatstone bridge