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 86
mes the normalsize. The object would then be magni- - diameters, or 61 times. (The area would appear 6 1 tunes a^ large.) Hut an obje< t | in. from the eye ap-pear-; so blurred that none of the de-tails are discernible, and it is for thisreason that the pin-hole is employed.Viewed through this… … with a mass of wriggling little worms, and may possibly cause the observerto ali-tain from all -alads forever after.An innocent looking drop of water, in which hay has been soaking for severalreveals hundreds of little infu-soria, darting across the Held in every direction. These and hundreds of…
Handicraft · Amusements
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
