Demonstrates the typical concept behind the architecture of Roman arch structures, which are famous for their strength in compressive loading. Comprise of a pre-assembled 3-part buttress and a set of 23 wooden blocks. A fully assembled arch can easily support the weight of a child.

Aluminium, diameter 50 and 40 mm, in metal frame with two hooks.

Comprises of a set of components to form different configurations of pulley blocks. Set contains 15 plastic pulley frames, 5 each of single, double and triple sheave, each provided with movable bearing pin and a pair of hooks. 30 plastic plain bearing, 10 each of diameters 25, 38 and 50 mm.

Plastic pulleys of diameter 25, 38 and 50 mounted on brass bearings and set in steel frames with hooks at the top and the bottom.

50mm plastic pulley with ball bearing fitted on an aluminium boss with tapped holes and a clamping screw to accommodate rods up to 13 mm diameter. Tapped holes are provided so that the pulley may be fitted on to the boss with its axis of rotation in any one of the three planes. It is of great use on an inclined plane and suitable for use in an ordinary lab apparatus.

Aluminium pulley, 70 mm diameter in metal bracket with two clamping screws for bench and rod support respectively. The bracket may be clamped to a board or bench edge up to 38 mm thick, screwed to a flat surface or held in a 13 mm diameter support rod.