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75 mm long, 115 mm radii, 25 mm thickness

Clear glass, ground edges.

To illustrate principles of lever and moment, five plywood beams 600 x 44 x 3 mm with ruled graduations at every 38 mm and a shallow groove across its centre for fulcrum point, with 4 wood fulcrums and forty 25 mm square metal blanks.

A Robust light box in matt black finish with a 12 V 24 W axial filament lamp with flexible leads. One end of the box takes a cylindrical convex lens in an adjustable sliding mount to enable production of convergent, parallel or divergent beams. Complete with accessories which consist of: 5 Plastic blocks, one rectangular, One semicircular, One equilateral prism 60° x 60° x 60°, One right angle prism 90° x 60° x 30° and one right angle prism 90° x 45° x 45°. 3 Cylindrical acrylic lenses: one double convex, one double concave, both having the same radius of curvature and one thick convex lens. 3 Mirrors, one plane glass, one curved parabolic and one curved semi-circular. 2 Slit plates, one with three narrow and one narrow slits, the other with four narrow and one wide slits 1 Set of eight colour filters, Red, Green, Blue, Cyan, Violet, Yellow, Orange and Magenta. 1 Set of coloured cards, Red, Green, Blue, Violet, Orange, Cyan, Yellow and Pink. Complete with one spare lamp, in box.

A 500 mm long metal rod is supported in a plated brass tube with three tubules for steam inlet, outlet and thermometer. The tube is mounted on a stand with an adjusting screw at one end and a micrometer screw reading to 0.01 mm on the other, with terminals for connecting a bell or galvanometer to indicate contact. With copper, brass and iron test rods but without thermometer.