Maker and Role
Roller Smith Company, Manufacturer
A Volt Ammeter for measuring either voltage or amperage in AC. 3- 60 amps, 6-240v. Contained within a wooden box with a half hinged lid on top, opening from the side. There is a single leather strap on right hand side. At the from there are five alternating brown bakelite knobs, two have lost their bakelite covers. Next to each knob is a small brass coloured plaque with their measurement number on them, ranging from 6-240. The rear of the box has four protruding screws with circular nuts attached. Two of the screws are larger than the other two. Inside the unit is a glass window displaying the volt ammeter scale in white with black text and a single metal needle.
Signature/Marks and Type
Alternating current Volt-Ammeter 50 cycles/ Not operative on direct current Printed
Made by the / Roller-Smith Co./ Bethlehem PA./ No.104835 Maker's Mark
Roller Smith Company. Circa 1910. Volt Ammeter [Roller Smith], 1979.90.1. The Museum of Transport and Technology (MOTAT).