These are made of slats strung on wires or ribbons so that they may be rolled on a coil placed in a pocket above the window head, the slats running in a groove at each side to keep them in position.

Details showing the construction of the guideway and finish for a great variety of arrange-

The slats are so arranged that air and light are admitted and a view from within can be obtained, although they cannot be seen through from without. They are made of various woods to match the standing finish.

Fig. 262 - Detail for Rolling Blind..

Rolling blinds do not require as deep a recess for the window as sliding blinds or shutters, but in frame walls with less than 8-inch studding it will be necessary to box out for the coil either inside or outside of the window. A single section of sliding blind fitted with movable slats is sometimes used at the bottom of the window in connection with the rolling blind, the sliding section being arranged to drop into a pocket behind the panel back. This shortens the rolling portion and reduces the size of the coil.

Fig. 262 shows a section through the jamb, head and sill of a window in a 12-inch brick wall, fitted with Wilson's Rolling Venetian Blind, with the coil placed in a pocket behind the stone lintel, and a sliding section at the bottom. When it is not practicable to place the coil in the wall it may be enclosed in an inside cornice placed above the window.*

The diameter of the coil, D, with the blinds rolled up, is 7 inches for a 5-foot blind ; 7 inches for a 6-foot blind, and 8 inches for a 7-foot blind.

Provision should be made so that the casing in front of the coil may be readily removed for oiling the bearings, and it is desirable that the whole front of the box be put up with screws so that the coil can be set in place after the finishing is done or may be removed at any time. By framing the rails of the top panel, Fig. 262, into the corner blocks and putting the latter up with screws, the whole front of the pocket may be readily removed, while the joint will not be perceptible when the finish is in place.

Rolling blinds have been quite extensively used in very fine residences, and are preferred by many to other styles of blinds, but to secure the best results they should be arranged for when the building is built. They are patented, and can only be obtained from one or two manufacturers.

Rolling blinds may also be fitted to work outside of the sash, and may be made of steel as a protection from burglars.