We're proud to list this VINTAGE 1911 OTTO WOLFF HISTORIC BERLIN 3831 POTENTIOMETER RESISTANCE BOX 17"x9.5"x8" as can be seen in the pictures.
Dimensions of the box are: 27" x 13" x 11" / This unit is very heavy at about 40 lbs so we will package it very well in order for it to arrive safely to buyer!
This box was decomissioned by the Unviversity of Michigan when they demolished the building it was in and they decided not to continue with their Museum for these type of equipment and that is why we have it here for sale, an opportunity to own a beautiful piece of history that doesn't come by very often so do not pass it by!
Comes with original Wooden Carrying Case with Side Handles.
Taken from the Web:
Deflection potentiometer
Resistance box plug type brass block in different ohms for measuring ohms.
Superior Quality Heavy Brass Metal Blocks Are Bound To Bakelite Plate By Means Of Nuts And Screws Securing Rigid Fixation And Eliminating Any Chance Of Contact Error Creeping Due To Loosening Of Plugs And Lugs Which Are Cut To Fine Taper And Are Interchangeable. Plug Heads Are Machine Molded and are made of Heavy Insulated Bakelite In Beautiful Shapes.
The Boxes Are Made Of Teak-Wood And Nicely Polished and great Care is Taken In Preparing The Wire Wound Resistance.
Selected Double Covered Eureka Wire Is Wound In Bakelite Spools. Sufficient Ageing And Heat Treatment Is Processed Through To Avoid Any Moisture Effects.
