Specifications and Drawings of Patents Relating to Electricity Issued by the U. S Volume 49
This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1887 edition. Excerpt: ...S. BERGMANN. TELEPHONE RECEIVER. No. 337,232. Patented Mar. 2, 1886. SIGMUND BERGMANS, OF NEW YORK, N. Y. TELEPHONE-RECEIVER. SPECIFICATION forming part of Letters Patent No. 337,232, dated March 2,1886. Application Bled December 31,1884. Serial No. 151.01'J. (Model.) To all whom it may concern: Be it known that I, Sigmund Bergmann, of New York city, in the county and State of New York, have invented a certain new and 5 useful Improvement in Telephone-Receivers, of which the following is a specification. The object I have in view is to produce a telephone-receiver which will be simple in construction, effective in operation, and will io maintain its adjustment in use. The main feature of my invention consists in the employment of one or more magnets acting upon a diaphragm or other sound-producing body, and so arranged and connected 15 that the current passes axially through them, an adjusting device being provided to vary or regulate the extent of the space through which the force is exerted. I have found that when this is done the vibrations of the diaphragm 20 correspond with the variations in the axial current, and sound is produced in accordance with the vibrations at the transmitter, the action being due, in my opinion, to variations in magnetic intensity. I have obtained the best 25 results by arranging two or more magnets in line, with their ends in close proximity, such ends being connected by suitable conductors of the current. The magnets are connected in circuit, the current passing through them 30 from end to end, or from ceuterto ends, or ends to center in both directions. Thediaphragmpiston or other suitable sound-producing body may carry one of the magnets, or it may have a soft iron armature attached to it, if it is of 35...
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