Gilbert light experiments for boys . Fig. 4. Shutter in window withother side showing and with card-board tacked over slit GILBERT LIGHT EXPERIMENTS 7 shape of the slit. To clo this you willmake slits of the right kind in blacktar paper or cardboard and then tackthese over the slit in the wooden shut-ter. Make the shutter so that you cantake it down and put it up quickly, be-cause you will want to experimentmany times and your mother will,probably, not want to leave the win-dow permanently

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Keywords: ., bookcentury1900, bookdecade1920, booksubjectscientificrecreation