| http://www.w3.org/ns/prov#value | - The illumination of these bulbs is controlled by a time delay circuit schematically illustrated in FIG. 6 and as hereinafter described, said circuit including triggering or actuating switch 18, unijunction transistor Q1, silicon-controlled rectifier Q2, batteries Bl, capacitor C1 and resistances R1, R2 and R3.
|
