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 circuitsWide range of accessoriesThe following components are also supplied with each board:18 flash lamp bulbs, 1.25V, 0.25A9 connectors with lamp holder12 plain connectors1 connector with rheostat1 rectifier1 resistor2 flexible leads with 4mm plug and crocodile clips2 flexible leads with crocodile clips2 crocodile clips2 mounted bell pushes2 soft iron nails, 50mm, square head1 length bare copper wire, 20 s.w.g.1 length bare Eureka wire, 34 s.w.g.1 length plastic-covered wire, 0.6mm1 hardboard disc, drilled4 pencil leads1 piece copper foil1 piece steel woolSupplied WITHOUT batteries.D Batteries can be purchased separately: B8R05412