These supports furnish single rigid frames that take the place of a number of ordinary supports, and make it possible to tie various parts of an apparatus assembly into firm units. Rods are fabricated of hard aluminum, connectors are die cast alloy, and clamping screws are nickel plated. The units are readily assembled or dismantled in a few minutes, and when not in use may be stored in a drawer or other small space. All have an 18 inch base.
