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  1. First Law (1993 Video)

    Subject
    Physics
    Distribution
    Sale, Videocassette. Standard formats. col. 25 min., 1999 sale: £85.00 (+VAT +p&p)

    Explores the first law of thermodynamics in terms of the energy inputs and outputs of a particular device, the hydraulic ram. The idea of perpetual motion machines is a fantasy, but it is used here to cue...

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  2. Hydraulic Ram, The (1983 Video)

    Subject
    Technology
    Distribution
    OUT OF DISTRIBUTION, Videocassette. Standard formats. col. 25 min.

    Perpetual motion machines are nothing but fantasy - an attempt to get something for nothing. The hydraulic ram, a self-pumping pump, seemingly does this. Using energy analysis, the programme explains why.

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