Title: Bulletin
Identifier: bulletin228smit (find matches)
Year: 1961-1962 (1960s)
Authors: Smithsonian Institution; United States. Dept. of the Interior; United States National Museum
Subjects: Science
Publisher: Washington, Smithsonian Institution Press, (etc. ); for sale by the Supt. of Docs. , U. S. Govt Print. Off
Contributing Library: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library
Digitizing Sponsor: Harvard University, Museum of Comparative Zoology, Ernst Mayr Library

View Book Page: Book Viewer
About This Book: Catalog Entry
View All Images: All Images From Book
Click here to view book online to see this illustration in context in a browseable online version of this book.

Text Appearing Before Image:
Thomas A. Edison designed a variation of the Lalande-Chaperon cell in 1889,- but later he invented another form of alkaline accumulator (fig. 34). Nickel-plated steel electrodes were covered with nickel peroxide and graphite to form the anode, and with finely divided iron and graphite to form the cathode. The electrolyte was again a solution of caustic potash. The very high currents that could be drawn by the Edison cell made it practical for use in electric trac- tion. In Edison's cell—a form of which is still used— the voltage was about 1.3 volts, and the current was even higher than that of the Lalande-Chaperon cell. The dry cell began with the 1868 cell of Georges Leclanche,*' which used a solid depolarizer (figs. 33, 35). In the Leclanche cell, a carbon electrode was inserted into a pasty mixture of manganese dioxide and other materials. A zinc electrode in a sal am- nionic solution was separated from this mixture by a ceramic cylinder. This cell gave 1.5 volts, but its pasty texture and its high internal resistance limited it to intermittent use, and its current strengths were not too high. However, it was used extensively in the 19th century for telegraph and telephone lines and for other signaling systems. The ancestor of the modern dry cell was C. Gassner's modification" (fig. 36) of the Leclanche cell. The electrical characteristics and uses of the Gassner cell were similar to those of the Leclanche cell. A paste of zinc oxide, sal ammoniac, plaster, and zinc chloride formed the electrolyte; and the zinc electrode formed the container. Commercial production of such dry cells began about 1890. After the middle of the 19th century, standardiza- tion of voltages became an increasingly important and, at the same time, difficult problem. At first the Daniell cell was used to provide a reference voltage, but in 1873 J. Latimer Clark ^^ devised an even more
Text Appearing After Image:
«U.S. Patent 430279, June 15, 1889; A. E. Kennelly, "The New Edison Storage Battery," Electrical World, 1901, vol. 37, pp. 867-869. *' Georges Leclanche, "Pile au peroxyde de manganese a seul liquide," Les Mondes, 1868, vol. 16, pp. 532-535. " German Patent 45251, 1887. See also, "Gassner's Dry Battery" in Eleclriciati, 1888, vol. 21, pp. 245-246, 703-704; 1889, vol. 24, p. 185; 1890, vol. 25, p. 508; 1892, vol. 28, pp. 643-644; and Heinrich Krehbiel, "Vergleichende Unter- suchung von Trockenelementen," Elektrotechnische ^eitschrift, 1890, vol. 11, pp. 422-427. *'J. Latimer Clark, "On a Voltaic Standard of Electromotive Force," Proceedings oj the Royal Society of London, 1872, vol. 20, pp. 444-448; "On a Standard Voltaic Battery," Philosophical Transactions, 1874, vol. 164, pp. 1-14; Lord Rayleigh and Mrs. Sidgwick, "On the Electro-Chemical Equivalent of Silver and Figure 23.—Smee cell. From F. C Bakewell, Manual of Electricity, London and Glasgow, 1859, P- 147- stable cell (fig. 37). The potential of the Clark cell was reproducible to an accuracy of one-tenth of 1 per- cent, and its use slowly spread. However, by the turn of the century the Clark cell began to be supplanted by E. Weston's standard cell,*^ which finally replaced on the Absolute Electro-Magnetic Force of Clark Cells, Philosophical Transactions, 1884, vol. 175, pp. 411-460. « U.S. Patent 494827, April 4, 1893. PAPER 28: DEVELOPMENT OF ELECTRICAL TECHNOLOGY IN THE 19TH CENTURY! I 576627—61 3 247

Note About Images