File:Gilbert light experiments for boys (1920) (14590840769).jpg

Identifier: gilbertlightexpe00lynd (find matches)
Title: Gilbert light experiments for boys
Year: 1920 (1920s)
Authors: Lynde, Carleton John, b. 1872 Gilbert, Alfred C. (Alfred Carlton), 1884-1961
Subjects: Light Light Scientific recreations
Publisher: New Haven, Conn. : A.C. Gilbert Co.
Contributing Library: Getty Research Institute
Digitizing Sponsor: Getty Research Institute

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Text Appearing Before Image:
Fig. 192. To make the bird enter the cage and this leads to the following apparent magic. Roll a piece ofpaper into a tube, hold it beside your hand, look at your handwith one eye and throughthe tube with the other. Do youappear to see through your hand? Look through other thingsin this way. Experiment No. 130. To put the bird into the cage. Drawa cage and a bird with centers about 2 inches apart on paper,stand a card on the line AB between them (Fig. 192), then look at GILBERT LIGHT EXPERIMENTS 125 the cage with one eye and at the bird with the other. Does thebird enter the cage ? The Moving-Picture Machine (Fig. 193) throws 12 to 16pictures on the screen each second and shuts off the light whileone picture is changing to the next. The pictures are taken atthe same intervals and differ very slightly one from the next(Fig. 194).
Text Appearing After Image:
Fig. 193, A moving-picture machine The Why of the Movies. The reason you see the picturescontinuously and are not aware that the light has been shutoff is that your eyes retain each picture for a short time afterit has left the screen. You will now illustrate this. Experiment No. 131. Circles of fire. Go into a dark room,light a match, blow it out but keep the live coal, and then wave 126 GILBERT BOY ENGINEERING it in the air. Do you see circles of fire? You do, because youreye retains the impressions for some time. Experiment No. 132. To put the bird into the cage. Drawa bird on one side of a piece of cardboard and a cage exactlyopposite on the other side. Attach cords above and below andspin the cardboard. Does the bird appear to enter the cage?It does, because your eyes retain the pictures of the cageand bird for a short time.

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