Amateur mechanics ... a book for old and young who like to make things .. (1907)
Popular mechanics magazine, Chicago. [from old catalog] · Chicago, Popular mechanics · leaf 53
d or other object in the light coming fromtwo incandescenl lamp-, one red and one white,placed about a foot apart ami allow the shadowto fall on a white Bcreen such as a table cloth.Portions of the shadow will then appear to be abright green. A Bimilar experiment consists infirst turning on the red… … POPULAR MECHANICS -jen the little window of yourdark room and expose the frame abouta second in the subdued daylight. Be-move the plate carefully and developin the usual way. There will be anegative of the picture you had at first;if you have been successful, if not. youshould try it a time or two,…
Handicraft · Amusements
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