Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . i h) is of no advantage. If we imagine now, instead of the long glass side g h, anotherinclined one, kg, of only 8 feet length, the angle of light kagwill then be exactly as large as the angle hag, or, which is thesame, the small side of only 8 feet will give as much light to theperson at a, as the long side of 28 feet. According to the above, the long side of 28 feet can be re-placed by one of 8 feet, when we propose to take the portrait ofa person at a. In the
Wilson's quarter century in photography : a collection of hints on practical photography which form a complete text-book of the art . i h) is of no advantage. If we imagine now, instead of the long glass side g h, anotherinclined one, kg, of only 8 feet length, the angle of light kagwill then be exactly as large as the angle hag, or, which is thesame, the small side of only 8 feet will give as much light to theperson at a, as the long side of 28 feet. According to the above, the long side of 28 feet can be re-placed by one of 8 feet, when we propose to take the portrait ofa person at a. In the same manner I can replace the long glassroof of 28 feet by an inclined one of 8 feet length. When I construct a glass-house now with inclined sides andan analogously inclined roof, I will obtain a room which, to the taking of single portraits,is as well adapted as one of 28 feet in length. Such a glass-house would have the formrepresented in Fig. 80. I do not mean to say, however, that it follows from the above that the constructionwith inclined sides is perfect. On the contrary, such a construction has some GLASS-HOUSE CONSTRUCTION. 85 plain, and is 30 feet long by lo feet wide; but of the length only 16 feetare of glass; the balance is a small room, which was. added to give it more Tig. 79.
Size: 1217px × 2052px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1880, bookidwilsonsquart, bookyear1887
