From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Informational leaflet for the Evershed & Vignoles MEG Insulation Tester.
| Identifier | ExFiles\Box 165\3\ img037 | |
| Date | 1st October 1922 guessed | |
| 2 EVERSHED & VIGNOLES, LIMITED. ACTON LANE WORKS, CHISWICK. 3 The MEG Insulation Tester Registered "MEGGER" Trade Mark FIG. 1 FIG. 2 The MEG INSULATION TESTER (Regd. Design) with handles closed for carrying, and open for use. The Origin of the Ohmmeter and Generator Testing Set Present day requirements It was in the year 1889 that Mr. Evershed, the pioneer of modern methods of insulation testing, introduced his Insulation Testing Set, in which for the first time an ohmmeter was used in conjunction with a hand generator to test insulation under pressure. The combined ohmmeter and generator also originated with Mr. Evershed, who in 1903 produced the "one-box" instrument which is known throughout the world as the "Megger" Testing Set, and which still remains unique and indispensable for important work. With the ever widening use of electricity there has, however, arisen a need for an instrument which, while not perhaps presenting all the advantages combined in a Megger Testing Set, performs all insulation tests efficiently at reasonably high pressure, and is so cheap that a contractor can largely multiply his testing facilities at reasonable cost. The instrument must combine with these advantages a reduction of weight which facilitates its being carried to the most distant and inaccessible job. | ||