. Bulletin - United States National Museum. Science. i-'ig. 33.— The LMqut 1849 Double E.\gle, pattern for the 20-dollar gold pieces first minted in Fig. 34.—Unique Proof Double Eagle. 1854. San Francisco Mint. Mounting coins for display has always presented a challenge. Whenever possible, they were mounted first in tightly closed individual boxes made of cellu- lose triacetate K I\'. These are attached to the display panel with small pieces of "Velcro," which consists of a strip of nylon hooks which adheres to another strip of nylon loops. When pressed together the hooks and
. Bulletin - United States National Museum. Science. i-'ig. 33.— The LMqut 1849 Double E.\gle, pattern for the 20-dollar gold pieces first minted in Fig. 34.—Unique Proof Double Eagle. 1854. San Francisco Mint. Mounting coins for display has always presented a challenge. Whenever possible, they were mounted first in tightly closed individual boxes made of cellu- lose triacetate K I\'. These are attached to the display panel with small pieces of "Velcro," which consists of a strip of nylon hooks which adheres to another strip of nylon loops. When pressed together the hooks and loops engage, creating a secure and easily ad- justable fastener. This method permits easy removal and replacement of display objects. In addition, by this mounting method the coins are raised against the background which accentuates them and produces a very attracti\e overall effect. Where the size or shape of a specimen precludes the use of boxes, the item is often secured in place with a special paraffin wax. The windows of the display room in the Arts and Industries Building were covered with filters which allowed only 8 percent light transmission, thus re- ducing the danger of harmful radiations and maintain- ing a low general light level in the exhibit area. Dis- turbing glare and mirror effects were also reduced, and the individual internal lighting of the cases was enhanced. This total lighting arrangement brought The display cases were provided with cold-cathode internal lighting. The light boxes were equipped with specially designed lenses of Lucite (mcthacrylate) for maximum light distribution. These lenses also serve as filters for some of the more damaging radiations, their filter properties for ultraviolet being optimal at a wavelength of 350 millimicrons The specially de- signed cases arc equipped with self-locking folding braces and 'i-inch polished safety plate Please note that these images are extracted from scanned page images that may have been d
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Keywords: ., bookauthorun, bookcentury1800, bookdecade1870, booksubjectscience
