Abstract: A planter formed of an open top box having a platform supported within and above the bottom of the box. A generally flat, horizontally arranged bag, containing a plant growing filler material rests upon the platform and substantially covers the open top of the box so that the box provides a liquid reservoir beneath the platform. A capillary type wick sheet arranged upon the platform and having a portion extending downwardly into the reservoir flows water, through capillary action, to the filler which may be exposed to the sheets through openings formed in the bag. A frame extends around the bag and is supported upon the box to extend the height of the box for appearance purposes, as well as to protect and contain the edges of the bag. Plants may be grown in the filler material through appropriate openings formed in the upper surface of the bag.

Abstract: The specification discloses an electronic or computer-based railway control signal interlocking system. Signals representing the settings or conditions of railway control elements e.g. track circuits, signals and points, and their control signals are checked as usual by the interlock equipment to establish route safety. However failures in the system may only be discovered when a change to a control element setting is attempted. Since long periods can elapse between changes a failure may lie dormant for some time. In order to reduce dormant wrong side failure periods to a minimum the signals supplied to the interlocking equipment are periodically switched to a predetermined state chosen to prove that when the interlocking equipment receives the switched signal that a wrong side failure mode does not exist in the switched signal path.