The Harris Worcester Circuit Board consists of a baseboard, terminals, a set of metal connection pillars and a number of clip-on flexible connection strips and accessory units, allowing a variety of circuits to be constructed quickly and easily. Phosphor-bronze connection strips are so designed that when flexed a little they are easily slipped over the pegs where their natural spring holds them in position and ensures a good electrical contact. Features:. Rapid assembly of simple circuits. Wide range of accessories. The following components are also supplied with each board:. 18 flash lamp bulbs, 1.25V, 0.25A. 9 connectors with lamp holder. 12 plain connectors. 1 connector with rheostat. 1 rectifier. 1 resistor. 2 flexible leads with 4mm plug and crocodile clips. 2 flexible leads with crocodile clips. 2 crocodile clips. 2 mounted bell pushes. 2 soft iron nails, 50mm, square head. 1 length bare copper wire, 20 s.w.g. 1 length bare Eureka wire, 34 s.w.g. 1 length plastic-covered wire, 0.6mm. 1 hardboard disc, drilled. 4 pencil leads. 1 piece copper foil. 1 piece steel wool. Supplied WITHOUT batteries. D Batteries can be purchased separately: B8R05412. Worcester Circuit Board is also available as a pack of 4: B8R07736.