Antique Cory Record Electrical Co Ohmmeter Cory-Record Wood Case Instrument

Description

Early 20th century Cory-Record Ohmmeter - Patent 22656/11 - Chas. Cory & Son Inc. New York, USA - Manufactured by The Record Electrical Company Ltd, England - Meter # 1015 - Gen: 500V. Wood case with metal flap over glass front; leather strap.

"Ohmmeter - instrument for measuring electrical resistance, which is expressed in ohms. In the simplest ohmmeters, the resistance to be measured may be connected to the instrument in parallel or in series. If in parallel (parallel ohmmeter), the instrument will draw more current as resistance increases. If in series (series ohmmeter), current will decrease as resistance rises. Ratio meters measure the ratio of the voltage across the resistance to the current flowing through it. For high resistances, the scale is usually graduated in megohms (106 ohms), and the instrument is called a megohmmeter, or “megger.”" (Source: Britannica)

"Established in 1845 at 278 Division St. on the lower east side of Manhattan the Charles Cory Company fabricated brass ship's railings, bells, bell pulls, speaking tubes and the like. Cory was able to capitalize on being one of the only brass ship's hardware manufactures in the country at a time when steamships were scarce. Son John F. Cory entered the business in 1851 and the firm underwent a name change to Chas Cory & Son. Between 1866-1892 Cory & Son focused primarily on patenting and installing signaling equipment, including electrical telegraphs, for various navies and merchant marines. John F. devoted over 40 years to the development and design of electrical signaling equipment with Cory & Son before passing away in 1892 after which his two sons Charles and John M. resumed operations. The company passed through generations of Corys continuing equipment production in various Manhattan & Brooklyn neighborhoods while expanding sales to offices in San Francisco, Seattle, and Philadelphia. In the spring of 1930, Bendix Aviation Corp of South Bend, Indiana, a partly owned subsidiary of General Motors, purchased outright Charles Cory & Sons Corporation. This marked the entrance of Bendix and General Motors into the marine industry. Cory & Sons was then operated first as a division of Bendix-Cory, other times Bendix Marine Corp (the successor to Cory & Sons & subsidiary of Bendix Aviation) until sometime in the early 1950s, the Cory & Sons name faded." (Source: Lannan Gallery)

"Record Electrical are a manufacturer of moving coil and moving iron indicators.1911 Company formed by John Westmoreland Record. 1937 Electric engine speed indicators and electrical instrument manufacturers. 1971 Owned by Thorn Electrical Industries. They are currently (2008) based in Manchester." (Source: Grace's Guide / Science Museum Group)

Condition

Good Overall - Gentle wear

Dimensions

10.25" x 5" x 7.75" (Width x Depth x Height)