To make a camera which shall answer this purpose is evidently not very difficult, and we will give an idea on the subject and leave our readers to work out the details themselves. The operator's own camera and lens may be used, and a makeshift arrangement consisting of black silesia running on iron rods, and fitting on to the lens at one end, and bearing a focussing screen and a dark slide to hold the sensitive surface at the other. We
have seen earlier that we may use the actual light of the sky itself, and this is shown also in fig. 54, where the camera is presented to the sky. If we are using a darkened room, then the camera must be tilted in the same manner; this may have some advan-tages, which in our opinion are out-weighed by the extremely awkward manner in which the camera has to be sloped, the sensitive surface, of course, having to be parallel with the negative. We come back, therefore, to the method of using tne reflected skylight, and fig. 55 will show us how to ar-range the whole apparatus. We have de-scribed the method of blocking-out ' the window.
The method of placing the negative in position, if more than one size is to be enlarged from, is by the use of carriers as used in dark slides, which should be provided with little buttons for fastening in place, and springs for holding the negative, these said carriers fitting into the aperture in the window. Or the negative may be placed in the dark slide of the camera, and the slide inserted in the groove in the ordinary way, and the shutters of the slide pulled out so as to allow of the free passage of the light through