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).
Product specification leaflet for the Weston Galvanometer, Model 375.
| Identifier | ExFiles\Box 33\4\ Scan229 | |
| Date | 7th October 1926 guessed | |
| Weston Model 375 THE Weston Galvanometer, Model 375, has been specially designed to meet the demand for a Portable Galvanometer of great durability, reasonable sensitivity and moderate cost. The instrument is mounted on a handsome base, so that the face, or scale, is inclined at an angle of 45 degrees. The base of the instrument is 3 1/4 inches in width, and the height, including binding posts, is 3 1/4 inches. The scale is 2.35 inches in length, is uniformly divided, and is calibrated 30-0-30. Each instrument is provided with a zero-adjusting device. In action the Galvanometer is extremely responsive and well damped; for example, on dead short-circuit it is aperiodic. The mechanical and electrical workmanship and design is of standard Weston quality, but the Model 375 has not, of course, the same order of sensitivity as our higher grade and more expensive Portable Galvanometers, Models 14 and 15. The resistance of Model 375 Galvanometer is approximately 29 ohms. The current required for a millimeter (1 scale division) deflection is 20-25 micro-amperes With 1 volt, a deflection of 1 millimeter (1 scale division) will be obtained through approx. 50,000 ohms, but as a deflection of 0.2 of a scale division can be readily detected, the Galvanometer is in reality, serviceable through approx. 250,000 ohms. To further illustrate the serviceability of Model 375, it should be stated that on any bridge measurements up to 2000 ohms, the determinations can be made to a better accuracy than 1/2 of 1%, and on values of 1000 ohms or less the accuracy is within 1/4 of 1%. The price of Weston Portable Galvanometer, Model 375, is 75/- list. Additional information will be furnished upon request. Weston Electrical Instrument Co., Ltd. DIRECTORS: DR. EDWARD WESTON E.{Mr Elliott - Chief Engineer} F.{Mr Friese} WESTON W. H.{Arthur M. Hanbury - Head Complaints} YAWGER UNITED STATES C. BROWN A.{Mr Adams} DAVY, M.I.E.E. (MANAGING) W. A.{Mr Adams} ROSS Audrey House, Ely Place, Holborn, E.C. 1. | ||