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).
Letter from Dayton Engineering Laboratories Co. describing the operation of their circuit breakers.
| Identifier | ExFiles\Box 31\1\ Scan093 | |
| Date | 5th October 1920 | |
| X1402 THE DAYTON ENGINEERING LABORATORIES CO. DAYTON, OHIO. Oct. 5th. 1920. Rolls-Royce Of America, Inc. Springfield, Mass. X.4218. Mr. M.{Mr Moon / Mr Moore} Olley. X.1815. Engineer. X.1402. Gentlemen:- We have your letter of September, 28, requesting information as to the circuit breakers furnished the Lincoln Motor Company. We are sending you, under separate cover, one of these circuit breakers so that you can examine, it and run such tests as you may wish to. We have been furnishing circuit breakers to practically all Delco customers for the last six or seven years. In somecases these circuit breakers are assembled directly on the back of our combination switch, while in other installations, the circuit breaker, as per sample, is used. This is in reality two circuit breakers in a single housing. One of these circuit breakers is of the vibrating type, having a single winding in series with a set of contacts. This circuit breaker is ordinarily used in regular lighting systems. The other circuit breaker is of the lockout type, and is made up with an additional winding connected directly across the contact, so that after the contacts have once been opened, due to overload, this second winding will hold the contacts open until the ground or load is released. The center terminal on this circuit breaker is common to the two circuit breakers. These circuits breakers are so designed as to cut in when the load will be between 27 to 30 amperers. The vibrating circuit breaker will allow from 5 to 7 amperes to pass through the circuit breaker when it is vibrating, while the lockout type will hold the flow of current through the fine winding to a small part of an ampere. If there is any further information you desire to have, relative to this equipment, we will be very glad to answer your questions. Yours very truly, (signed) O.{Mr Oldham} L. Harrison, Sales Manager. | ||