As a matter of fact, in using the sketching camera, it is necessary to turn one’s back to the objects sketched, if it is desired to draw them in an upright position. I have represented the artist facing the house, as it would look strangely in the illustration to see him seated with his back to the view; but he is compelled, in consequence, to draw his house, sister, and everything else which is included in the image thrown upon his paper upside down, as a penalty for appearances.
To those boys living in the country, and having a wide, extended landscape stretched out before their windows, the “darkened room” is a very interesting feature. It simply requires a room which can be made perfectly dark. At the window (if there are more than one) commanding the broadest prospect have a perfectly tight, opaque screen fitted, with a small hole cut in the lower part for the insertion of the lens. Over this fasten a small mirror to receive the image, at such an angle as will throw the reflection down upon a stand placed two or three feet from the window, and thus make it possible for the spectator to view the scene in its normal condition. Should you be desirous of having the whole sweep of the horizon at your command in the darkened room, a simply constructed frame-work is necessary for the accommodation of the movable mirror, and also for the lens; this would further necessitate the cutting of a larger hole in the curtain. Fig. 5 represents this arrangement; _a_ being the movable lens, which can be readily taken from its socket if desired; _b_, the hole in the bottom of the bracket, which should correspond to a larger hole in the shelf _d_, upon which the bracket rests, and can be easily turned in any direction desired. This hole should be large enough to allow the passage of all the diverging rays, and _c_, a small mirror, fitted like the one for the sketching camera just described, to receive the image and reflect it down through _b_ upon the stand, or a sheet placed upon the floor for the screen. The height of the shelf _d_ from the floor is determined by the focal length of the lens, and must be decided by experiment before the hole is cut in the shade. It is fastened in place by strings attached to small screw-eyes at its corners, and tied upon tacks driven into the window-frame. The arrangement shown in Fig. 5 can be moved on the shelf, so as to face the lens toward any portion of the view commanded by the window.