This Ohmmeter/Bonding Tester by Evershed and Vignoles for the Royal Air Force is a rare collectible that showcases the precision and craftsmanship of early military electrical testing equipment. Whether for display, historical preservation, or study, it offers a unique glimpse into the tools that ensured electrical safety and effectiveness in the RAF.
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Own a rare piece of British military engineering with this Ohmmeter/Bonding Tester by Evershed and Vignoles, designed specifically for the Royal Air Force. Manufactured under patent 198192 from 1923 this instrument combines historical significance with precision functionality, allowing it to test electrical bonding with remarkable accuracy. It’s housed in a sturdy wooden case, complete with sockets for two probes (P/N 5G/5207) and a compartment for a rechargeable alkaline cell. According to original Ministry of Defence documentation, this bonding tester was last serviced and tested as serviceable in 1991, attesting to its durability and reliability.
Key Features:
Designed for Precision Bonding and Ohm Testing: The ohmmeter uses a unique dual-coil meter movement—similar to those found in insulation testers by Evershed and Vignoles (now known for their Megger brand). It measures low resistance with high accuracy, reading from zero to 0.1 ohms, making it invaluable for verifying grounding and bonding continuity in electrical circuits.
Historical Military Engineering: Originally crafted for the Royal Air Force, this tester reflects the high standards of British military equipment from the early 20th century. Used extensively to ensure safe and effective bonding in RAF equipment, it combines both historic design and functionality, a testament to Evershed and Vignoles’ legacy in precision electrical instruments.
Quality Built in Wooden Case with Original Paperwork: The instrument is encased in a robust wooden box that securely holds the tester, probe sockets, and battery compartment. It comes with Ministry of Defence paperwork verifying its serviceable condition in 1991, adding authenticity and collectible value to this rare piece.
Product Details:
Condition: Excellent vintage condition; last service tested in 1991
Part Number: 5G/6625-99-109-7544
Patent Number: 198192 (1923)
Measurement Range: Zero to 0.1 ohm
Collector’s Appeal: Ideal for collectors of military or aviation history, electrical engineering enthusiasts, and those with a focus on vintage testing instruments
Pictures are stock images of our inventory. Unless otherwise noted, you will not be receiving the exact item shown in the pictures. The pictures are representative of the item's general condition. The item you receive might be slightly better, or worse, condition than was shown in the pictures.
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