 | Royal Society (Great Britain) - Electronic journals - 1857 - 656 pages
...average time of exposure ; a period which, even were it prolonged four or five times, would not then be too severe a tax upon a steady and skilful hand and eye. Description of the Photographic Process. The glass employed for taking the original negative of the... | |
 | Royal Society (Great Britain) - Electronic journals - 1857 - 650 pages
...average time of exposure ; a period which, even were it prolonged four or five times, would not then be too severe a tax upon a steady and skilful hand and eye. Description of the Photographic Process. The glass employed for taking the original negative of the... | |
 | Physics - 1857 - 1142 pages
...average time of exposure ; a period which, even were it prolonged four or five times, would not then he too severe a tax upon a steady and skilful hand and eye. Description of the Photographic Process. The glass employed for taking the original negative of the... | |
 | Literary and Philosophical Society of Manchester - Natural history - 1864 - 1170 pages
...an eyepiece, with a power of 200 on the finder, keeping the cross-wires steadily on one spot. With this instrument Mr. Hartnup had taken a large number...his paper Mr. Crookes gives some particulars as to the time required to obtain negatives of the moon with different telescopes, from which it appears... | |
 | William Laxton - Architecture - 1866 - 466 pages
...photography, by having a proper arrangement of lenses, so as throw an enlarged image of the moon at once ou the collodion plate ; and he states that the want...severe a tax upon a steady and skilful hand and eye. Mr. Grubb read a paper on this subject before the ,Dublin Photographic Society on May 6th, 1857. After... | |
 | George Frederick Chambers - Astronomy - 1867 - 888 pages
...collodion plate; and he states that the want of light could be no objection, as an exposure of from 2 to 10 minutes would not be " too severe a tax upon a steady...his paper Mr. Crookes gives some particulars as to the time required to obtain negatives of the Moon with different telescopes, from which it appears... | |
 | Richard Anthony Proctor - Moon - 1873 - 472 pages
...collodion plate; and he states that the want of light could be no objection, as an exposure of from 2 to 10 minutes would not be .' too severe a tax upon a steady...his paper Mr. Crookes gives some particulars as to the time required to obtain negatives of the moon with different telescopes, from which it appears... | |
 | George Frederick Chambers - Astronomy - 1877 - 968 pages
...and he states that the want of light could be no objection, as an exposure of from 2 to 10 minufes would not be ' too severe a tax upon a steady and...his paper Mr. Crookes gives some particulars as to the time required to obtain negatives of the Moon with different telescopes, from which it appears... | |
 | Photography - 1866 - 640 pages
...as an exposure of from two to ton minutes would not be " too severe n tax upon a steady and skilfnl hand and eye." In an appendix to his paper, Mr. Crookes gives some particulars as to the time required to obtain negatives of the moon with different telescopes, from which it appears... | |
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Crookes afterwards enlarged his negatives -twenty diameters, and he expresses his opinion that the magnifying should be conducted simultaneously with the photography by having a proper arrangement of lenses, so as to throw an enlarged image of the moon... 