Abstract: A peripheral, radial surface extends outwardly and upwardly from the bottom surface of a circular tub which supports a walking dragline excavator or like machinery. The extension surface reduces bearing pressure on the tub in both stationary and walking positions, and facilitates sliding of the tub relative to underlying terrain as the equipment is moved. The extension surface is angularly disposed relative to the bottom tub surface so as to be substantially parallel to the terrain during walking movement of the dragline. Thus, the dragline load is distributed over a relatively large area, and the bulldozing effect of the tub's trailing edge is minimized.

Abstract: A simplified miter box suitable for use with a conventional carpenter's saw comprises upper and lower relatively rotatable platforms with a pair of radially spaced, upstanding saw guide posts fixed to the lower platform. Each post has a vertical, upwardly open saw guide slot extending therethrough. The slots are radially aligned with each other. The upper platform rotates about the first post and has an outer circular edge captured for sliding movement by a complementary groove in the second post. An upstanding workpiece support is fixed to the upper platform, and an angular scale alignable with a reference mark of the lower platform is inscribed on the upper platform outer edge.