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Diameter 50 mm, in metal frame, with two hooks.

A low cost pulley for simple machines experiments, rigid plastic sheave with a deep V – groove, 50 mm in diameter. Can be attached to surfaces up to 25 mm thick.

Fitted on a wooden base cast metal uprights and rod mountings. A 20-0-20 scale is provided to notice the expansion in rods. The counter weighted needle is used for easy reading. A knurling screw is provided for zero adjustment. Supplied with three metal rods one of each Aluminium, Brass and Steel.

Consists of 2 lamps and two stands, 1 pair housing shields, 2 combined single and triple slit plates, 2 multiple slit combs, 2 holders for combs and slit plates, 4 wooden light barriers, and following cylindrical lenses, of size 50 x 50 mm. 4 No Lenses of +7D, 2 of +10D, 2 of +17D and 2 of -17D.

The ring launcher consists of a vertically mounted solenoid of thick copper wire with an iron core. The coil is energized with by pressing the push button on the panel. Two aluminum rings are supplied with the apparatus. These rings fit over the solenoid and are supported at some height above the base by an adjustable collar. The behaviour of the rings when the coil is energized depends on the type of the ring placed over the coil at the time. The solid aluminum ring is propelled straight up while the slotted ring remains static, thus demonstrating the principle of electromagnetic induction as well as Lenz law.