. The Bell System technical journal . mmlj^ .9Rj. Fig. 21—Electron-micrograph (above) and photo-micrograph (below) of platinum ribbon. and photo-micrograph f of a portion of a platinum filament. Cor-responding crystals have been labeled by 1, 2, 3 and 4. The readercan find more cases of correspondence. Of course, a perfect cor-respondence is not to be expected since two neighboring crystals mayhave the same reflection properties for light while the electron emis-sivities differ and vice versa.

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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1