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Thread: Camera Obscura

  1. #1
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    Default Camera Obscura

    Some RCAF training reports, involving Wapiti day bombers (1937-39) mention use of the "camera obscura". The context suggests a synthetic training aid, adaptable to both air and ground use, although I may be wrong about aerial deployment. Is anyone sufficiently learned in the use of such devices that they can explain, in 500 words or less, how the "camera obscura" was used as a training aid, what skills it was to develop, and just how it worked ?

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    Hugh,

    Page 66 of this has what you want. In less than 500 words:

    http://www.salisbury.gov.uk/old-sarum-airfield-appraisal.pdf

    Also: http://www.archive.org/stream/howtherafworks030792mbp/howtherafworks030792mbp_djvu.txt:

    Another device is known as the Camera Obscura, and it
    is used in conjunction with aircraft. It consists of a wide-
    angle lens fitted into the roof of a small hut or tent, giving
    a clear view of the sky overhead. A picture of the expanse
    of sky is reflected on a piece of paper pinned to a table
    immediately below the opening of the lens. In this way
    one can look down at the paper and see the sky as clearly
    as if one were lying on one's back in a pleasant meadow
    on a sunny afternoon. The pupil bomb-aimer is sent up
    in an aeroplane fitted with a device which flashes a light
    as the bomb lever is pulled. As the 'plane speeds overhead
    a man in the hut under the lens plots its course with a
    pencil on the paper and when the light flashes in the
    aeroplane he marks the spot and calculates the margin
    of error, if any.

    Regards,

    Dave
    Last edited by alieneyes; 9th September 2009 at 09:26.

  3. #3
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    Default Camera Obscura

    Just what the doctor ordered - many thanks.

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