| 摘要 |
A low cost and yet versatile shadowgraph is described. The shadowgraph has two components, a transparency holder and a point light source with its mounting and energizing structure. The transparency holder is itself transparent and acts as a backing for a transparency whose shadow is to be formed. The point light source is provided by a flashlight bulb and it is mounted on a slidable collar which is, in turn, mounted on a linear post to enable the position of such light to be adjusted along one axis laterally of the projection surface. Movement of the light source along other axes is naturally done manually so as to minimize the expense associated with manufacturing the shadowgraph.
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