. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. STUDIES ON MUSEUMS AND KINDRED INSTITUTIONS. 389 figuvo of a prismatic ribbed ^lass plate and a single prism. The latter may be had up to a consideni})le size. The flat form (multi-prism plate) costs $30 to $40 a sc^uai-e yard; and the ribbed glass plates in their copper frames, $20 a s(juare 3^ard. I have made a trial of a window with about 5 scpiare yards of plate g-hiss in the ethnographic department of the Dresden Museum. because I cons
. Annual report of the Board of Regents of the Smithsonian Institution. Smithsonian Institution; Smithsonian Institution. Archives; Discoveries in science. STUDIES ON MUSEUMS AND KINDRED INSTITUTIONS. 389 figuvo of a prismatic ribbed ^lass plate and a single prism. The latter may be had up to a consideni})le size. The flat form (multi-prism plate) costs $30 to $40 a sc^uai-e yard; and the ribbed glass plates in their copper frames, $20 a s(juare 3^ard. I have made a trial of a window with about 5 scpiare yards of plate g-hiss in the ethnographic department of the Dresden Museum. because I consider the subject important for museums so long as they have not learned to build them with ail rooms eciually well lij^hted: Everybody has perhaps noticed that rooms on the ground floor, under most cir- cumstances poorly lighted, in winter, when the window panes are thickly covered with frost, have an agreeable, uniform light. They have perhaps also noticed that at other times, when the panes are clear and dry, only a small space near the window is really well lighted and the other parts of the room remain more or less in shadow. In the case of the frost a peculiar diffusion of the light is noticeable, the sharp con- trast between the part near the window and the imier i)art has disappeared, and only very gradiaally does the intensity of the light dinnnish toward the back part of the room. For lighting a room !)y daylight by means of its windows, the bit of open sky which looks in through the windows is more important than anything else. The. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Smithsonian Institution. Board of Regents; United States National Museum. Report of the U. S. National Museum; Smithsonian Institution. Report of the Secretary. Washington : Smithsonian Institution
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