. Photographic pastimes : a series of interesting experiments for amateurs for obtaining novel and curious effects with the aid of the camera. .Photogmphed by M, A, Bu^u^tt PHOTOGRAPHIC PASTIMES. TESTING THE LIGHT OF A GLOW-WORMUPON A SENSITIVE PLATE. To carry out this interesting experi-ment, one of the well-known shining littleglow - worms [Lampyris noctiluca L.)which, during the last half of the monthof June, will be easily detected at nightin moist, warm places, is placed on agelatine plate, preferably on its reverseside, so that the action of its phosphores-cence may be placed beyond doub
. Photographic pastimes : a series of interesting experiments for amateurs for obtaining novel and curious effects with the aid of the camera. .Photogmphed by M, A, Bu^u^tt PHOTOGRAPHIC PASTIMES. TESTING THE LIGHT OF A GLOW-WORMUPON A SENSITIVE PLATE. To carry out this interesting experi-ment, one of the well-known shining littleglow - worms [Lampyris noctiluca L.)which, during the last half of the monthof June, will be easily detected at nightin moist, warm places, is placed on agelatine plate, preferably on its reverseside, so that the action of its phosphores-cence may be placed beyond doubt, andallowed to walk to and fro for a fewminutes. If the plate is then developed,the marks of the marching glow-wormwill be quite distinct. The places whereit remained stationary will, of course, bethe most intensely affected ones, but theplate will probably show also allgradations from the lightest shades—which correspond to the quickest paceof the worm—to complete opacity. (17.) CHAPTER II. CURIOSITIES. .11 *^ CHAPTER II. DOUBLE-POSE PHOTOGRAPHS. A double-pose photograph, or, shortly,a double,means a representation of. Fig. 13.—Djuble-pjse Photograph. 54 PHOTOGRAPHIC PASTIMES- the same individual in two places in onepicture. So, for instance, a gentleman maybe represented playing chess with himself,or a person shaking hands with himself, photographs can be easily andperfectly produced by means of a simplearrangement which may be added to anyrigid camera. Mr. H. P. Robinson hasdescribed such an arrangement manyyears ago. A diaphragm, A (fig, 14), isfixed in the camera immediately in frontof the grooves in which the dark slide isinserted, having an aperture measuringfor cards about 4 by 2| inches. A pieceof zinc, B, is made to fit against thestuds b b ; it rests on the studs c c, andis secured in its place by the button d. To take a picture, the sitter is placedso that the image shows on the groundglass through the aperture left uncoveredby the mask
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidphotographicpast00schn
