This article describes solar dial time switches which incorporate an eccentric cam and preset tappets, thus ensuring that street lighting is switched on and off at dusk and dawn and enabling daily corrections to be carried out automatically spring-reserve time switches ensure drive to the timing mechanism for up to 9 hours in the event of a power failure. A brief review is presented of light sensitive devices, with or without solid state electronic circuitry, that can enable lighting in conditions of inadequate natural light at any time. /TRRL/

  • Corporate Authors:

    Illuminating Engineering Society

    York House, 199 Westminster Bridge Road
    London SE1 7UN,   England 
  • Authors:
    • Woolnough, A F
  • Publication Date: 1972-11

Media Info

  • Features: Figures; Photos;
  • Pagination: p. 330-2
  • Serial:

Subject/Index Terms

Filing Info

  • Accession Number: 00260504
  • Record Type: Publication
  • Source Agency: Transport and Road Research Laboratory (TRRL)
  • Files: ITRD, TRIS
  • Created Date: Oct 11 1974 12:00AM