An Inexpensive Laboratory Jack Apparatus for Undergraduate Laboratories The availability of a very law cost laboratory equipment jack, made from easily obtainable materials and requiring the use of tools which should be available in any departmental workshop, allows a much wider use to be made of such jacks. The jack described herein may be made virtually of any size and hence a series of jacks can be easily constructed for a particular laboratory.
Cube dimension (cn) 6
Maximum Minimum height height (cm) (cm) 7
9 12 15
18 21 The jack is made from a cube of wood, or, for large sizes, a hollow cubic box. The cube is sawn diagonally from a point one third of the cube height onone end, across to a point two thirdsof its height on the opposite end. Two side ~ l a t e sare cut from sheet metal or thin olvwood. as shown in the e a ~ l a d e dview of the comwnent Darts, and are fixed by screws t o the section of the sawn cube Ghfhich will be the lower half. Clamping screws to pass through the inclined slots in the side plates are of coarse thread, and screw into drilled and tapped holesin the upper section. The range of height adjustment is one third of the height of the original cube. For easy reference, the minimum and maximum heights for a series of cubes are shown in the table.
James Cook University of North Queensland Townsville, Australia
348 / Journal of ChemicalEducation
L.F. Power H. Bedford
