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354,440: 2 of 3

frame having parallel grooved rails, with a parallel series of blocks slid between the rails, with their acute angles in the grooves and the long side in the plane of the frame, substantially as and for the purpose described.
    3. An incidence-window composed of an inclined frame with its upper end most remote from the building, and having triangular prismatic 		blocks with one face in the plane of the frame, and with the block itself projecting upwardly, substantially as shown and described.
ISIDOR SCHOENBERG.
Witnesses:
    THOS. M. NORRIS,
    WM H. MASSON.