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Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 7. (ed. Frank Moore) 21 3 Browse Search
Comte de Paris, History of the Civil War in America. Vol. 4. (ed. Henry Coppee , LL.D.) 12 0 Browse Search
George P. Rowell and Company's American Newspaper Directory, containing accurate lists of all the newspapers and periodicals published in the United States and territories, and the dominion of Canada, and British Colonies of North America., together with a description of the towns and cities in which they are published. (ed. George P. Rowell and company) 8 0 Browse Search
Elizabeth Cary Agassiz, Louis Agassiz: his life and correspondence, third edition 4 0 Browse Search
Knight's Mechanical Encyclopedia (ed. Knight) 4 0 Browse Search
Rebellion Record: a Diary of American Events: Documents and Narratives, Volume 5. (ed. Frank Moore) 4 0 Browse Search
Horace Greeley, The American Conflict: A History of the Great Rebellion in the United States of America, 1860-65: its Causes, Incidents, and Results: Intended to exhibit especially its moral and political phases with the drift and progress of American opinion respecting human slavery from 1776 to the close of the War for the Union. Volume II. 4 0 Browse Search
Benson J. Lossing, Pictorial Field Book of the Civil War. Volume 3. 4 0 Browse Search
The Daily Dispatch: March 16, 1864., [Electronic resource] 2 0 Browse Search
Southern Historical Society Papers, Volume 35. (ed. Reverend J. William Jones) 2 0 Browse Search
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Browsing named entities in Knight's Mechanical Encyclopedia (ed. Knight). You can also browse the collection for Ritter or search for Ritter in all documents.

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Knight's Mechanical Encyclopedia (ed. Knight), P. (search)
mist, Sheele, in 1777, was the first to consider philosophically the action of sunlight upon certain compounds of silver, and especially to draw attention to the activity of the violet and blue rays as compared with the rest of the spectrum. Ritter, in 1801, proved the existence of dark rays beyond the violet end of the visible spectrum, by the power they possessed of blackening chloride or silver. Wollaston also published some experiments on the changes which light produced in gum-guaiacum, corroborating Ritter's views as to the activity of invisible rays. Wedgwood, the great potter, was the first person who made any attempt to use sunlight for copying or delineating objects. In 1802 he contributed a paper to the Journal of the Royal Institution of England, entitled An Account of a Method of copying Paintings upon Glass, and of making Profiles by the Agency of Light upon Nitrate of Silver; with Observations by H. Davy. He used white paper or white leather moistened with a