Resistance of a wire investigation apparatus. Four wires, 50cm long mounted on a hardwood and acrylic base with connection made by a 4mm socket. The wires are all the same diameter 0.45mm (26SWG) but are four different materials, Constantan, manganin, nichrome and brass. A graduated mm scale is included allowing distance vs length and resistance vs material to be investigated easily. Board dimensions 540 x 90 x 25mm.