Gilbert light experiments for boys . Fig. 185. The camera obscura hold postcards, drawings,and other small objectsupside down against thebook, the lens will throwerect and enlarged imageson the screen, and yourshow is on. The PhotographicCamera is simply a light-proof box with a converg-ing lens in one side anda plate holder in theother. The lens L () throws an invertedimage ba of the objectAB on the plate S. Experiment No. illustrate the camera. Put your converging lenses in turn ina ring holder, and put the holder in a hole in one end of a card-board box (Fig. 184). Cover the b

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Gilbert light experiments for boys . Fig. 185. The camera obscura hold postcards, drawings,and other small objectsupside down against thebook, the lens will throwerect and enlarged imageson the screen, and yourshow is on. The PhotographicCamera is simply a light-proof box with a converg-ing lens in one side anda plate holder in theother. The lens L () throws an invertedimage ba of the objectAB on the plate S. Experiment No. illustrate the camera. Put your converging lenses in turn ina ring holder, and put the holder in a hole in one end of a card-board box (Fig. 184). Cover the box and your head with a darkcloth and move the screen back and forth until you get a picture. The CameraObscura()has a combinedlens and reflectingprism at the topwhich throws apicture down onthe table in frontof the artist. E x p e r i mentNo. 126. To make Fig. 186. You make a camera obscura a Camera ob-. 122 GILBERT BOY ENGINEERING

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation