Word: plate
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Dates: during 1890-1899
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...only a short time ago that the remarkable discovery was made by Professor Rontgen of Wurzburg of a means of obtaining on a photographic plate, images of objects covered by wood or other material impervious to rays of light. It must therefore be a matter of great interest to the University to learn of the experiments now being carried on in the same line, and it would seem with much success, by Professor Trowbridge in the Physical Laboratory. An account of the experiments is given in another column. It is interesting to note how quickly the attention and study...
Professor Trowbridge, director of the Jefferson Physical Laboratory obtained on Wednesday afternoon a distinct impression upon a photographic plate by means of the Professor Rontgen cathode rays acting through wood and pasteboard. The impression has been fixed and is capable of giving a print upon ordinary blue print or other sensitive paper...
...very sensitive Cramer dry-plate about four inches long and 1.5 inches wide, was put, film side up, into a wooden box, having a close-fitting sliding wooden cover. Upon the sensitive plate were laid two clear glass slips, less than one sixteenth of an inch thick. A space was left between them about four inches long and one half an inch deep. Across the glass slips to hold them in place was put a narrow bar of pine wood five-sixteenths of an inch thick. The wooden cover, three-sixteenths of an inch thick, was then pushed into place...
...effects were less sharply localized than usual. From the ease with which the photographic effect was obtained, it appears doubtful whether so complicated and powerful electrical apparatus was really necessary. It happened to be at hand and was therefore used. It is evident that the impression obtained on the plate is rather a print than a negative...
...produced the effect, it certainly worked through a thickness of wood which at one place was not less than one-half an inch. At other places the thickness of the wooden shield was only about one-eighth of an inch, but it is very difficult to distinguish on the plate the part that was covered by the extra thickness. It is evident that an effect would have been produced through more than one inch of solid wood...