Page:The museum, (Jackson, Marget Talbot, 1917).djvu/123

Rh polychroming is in a delicate condition, or rope must be used. If ropes are used the standards must be heavily weighted in the base. Iron or brass rods firmly fixed to the floor should never be used because, if they are moved, the holes in the floor always show.

GLASS

In equipping top-lighted galleries, the building committee and the director will find themselves confronted with the interesting problem of choosing suitable glazing. Under present conditions, on account of the war, this will prove a difficult matter, as all the glass best adapted to gallery purposes was produced abroad; the finest of all in Belgium. There are a number of requisites that need to be complied with: 1. the glass must be as white as possible; 2. the figure must be inconspicuous; 3. it must be so designed as to hide beams, outer skylight and electric fixtures; 4. it must diffuse the light well. In order to test these different qualities it is well to arrange in the ceiling of one large room samples of different glasses available in the market. The samples should not be too small, four or six large sheets of each should be used. It will be found that the ordinary ground glass, while it answers the second and third requirements best of any, has yet