. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . PETERS. Phoio-UthoRrapW. Washington. D. C. (No Model.) 2 Sheets—Sheet 2. T. A. EDISON. DYNAMO ELECTRIC MACHINE. No. 287,512. Patented Oct. 30, United States Patent OfficEo THOMAS A. EDISON, OF MENLO PAEK, NEW MACHINE. SPECIFICATION forming part of Letters Patent No. £87,512, dated October 30, 1883. Application filed June 29,1883. (Nomodel.) I To all whom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andI State of New Jersey, have invented
. Collection of United States patents granted to Thomas A. Edison, 1869-1884 . PETERS. Phoio-UthoRrapW. Washington. D. C. (No Model.) 2 Sheets—Sheet 2. T. A. EDISON. DYNAMO ELECTRIC MACHINE. No. 287,512. Patented Oct. 30, United States Patent OfficEo THOMAS A. EDISON, OF MENLO PAEK, NEW MACHINE. SPECIFICATION forming part of Letters Patent No. £87,512, dated October 30, 1883. Application filed June 29,1883. (Nomodel.) I To all whom it may concern: Be it known that I, Thomas A. Edison, ofMenlo Park, in the county of Middlesex andI State of New Jersey, have invented a new and15 useful Improvement in Dynamo-Electric Ma-i chines, (Case No. 577,) of which the followingis a specification. This invention relates to the bed-plates onwhich dynamo-electric machines are mount-p ed, its object being to maintain a circulationI of air about the armature and between thearmature and pole - pieces of the machine, whereby undue heating of the armature is| prevented; and I accomplish this object by5 providing openings in the bed - plate uponwhich the machine rests, which openings per-I mit air to penetrate to the space between thepolar extensions in which the armature re-volves. The bed-plate is p
Size: 1427px × 1750px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., boo, bookcentury1800, booksubjectinventions, booksubjecttelephone
