A desk formed of fine ground glass, used for retouching photographic negatives.

plural of retouching frame

plural of lever frame

(rail transport) A frame in a signal box in which levers that operate signals and points are mounted.

plural of drawing frame

A machine in which carded wool, cotton, or similar is drawn out fine.

plural of frame bridge

A bridge constructed of pieces of timber framed together.

A machine for stretching cotton rovings before they are spun into yarn. / A frame on which starched fabrics are dried.

plural of stretching frame