Method of making plated hole printed wiring boards

摘要

329,789. Bradshaw, G. April 22, 1929. Railways and tracks for recreation. - In a gravity railway the cars are in the form of sledges supported by wheels adapted to run in a hidden guide on one side of the sledge only and having runners to move just above an imitation track arranged around a structure simulating an iceberg or alpine scene. The cars comprise two runners 8, 9 mounted below, and bars 11 above two axles 6, 7 to which are rotatably fixed wheels 4 running in guides 2, 3, which are so arranged in the structure built of girders, stays, etc., that only the slot through which the axles pass is visible. A track 16, broken in places 17, 22, and passing through tunnels 19 is provided just below the sledges, and for novelty is broken in places, the sledges thus appearing to jump over a gap. Other scenic effects including running water. mirrors, paintings etc. may be used over the course.