San Francisco, Calif. : Architect and Engineer Co · leaf 172
p and bottom withan adjustment to take up any shrinkage.They are held in place at the sides bygrooves, and roll up and down the same asa window shade. Their application is verysimple, consisting of a shaft upon whichare drums containing heavy steel springs.The shafts are supported at each end… … the place of the shade fixtures, the shaftand drum of the roller and the partition ofthe cloth shade. Where they are used be-tween class-rooms in school buildings weapply a blackboard surface of liquid slatingto one side of the partition, and if necessary,furnish a hanging blackboard for the…
Architecture · Building
Internet Archive · Public Domain Mark 1.0. Free to use for anything.
