Abstract: An operable glass block window comprises a window frame sized for insertion into an opening in a structure. A window sash is provided which carries a plurality of glass blocks. The glass blocks are connected to one another to form a rigid panel, and the panel is connected to the window sash to form an integral structure. Hinges or pivots are provided for connecting the sash to the frame to allow the sash to move relative to the frame.

Abstract: A spacer used with substantially rectangularly-shaped glass blocks of the type having a ridge positioned intermediate its top, bottom, and side edges. The spacer comprises first and second oppositely positioned channel portions adapted to receive the seams of adjacent glass blocks. The channel portions define first and second ends. First and second oppositely positioned curved portions extend from the first end of the channel portions and a first pad extends from a junction between the first and second oppositely positioned curved portions. Third and fourth oppositely positioned curved portions extend from the second end of the channel portions and a second pad extends from a junction between the third and fourth oppositely positioned curved portions. The first, second, third, and fourth curved portions are each configured to form a friction fit with adjacent glass blocks while the lips of the adjacent blocks contact the first and second pads.