Journal - Franklin Institute of the State of Pennsylvania (1826)
Franklin Institute, Philadelphia, Franklin Institute (Philadelphia, Pa.) · [Philadelphia : Franklin Institute] · leaf 488
h, while Bells original instrument would not. In order the better to compare the invention set forth in the caveatof Gray with that of Bell, we will annex a short description of thatpart of the apparatus described in Bells application of February 14,1876, the application that is claimed to cover… … Fig. 2.—Bells original instrument. This apparatus is described in his specification as follows, viz.:The armature c, is fa.stened loosely by one exticmity to the uncov-ered leg d, of the electro-magnet b, and its other extremity is attachedto the centre of a stretched membrane, a. A cone. A, is…
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