A Manual Of Photography

274 PRACTICE OF PHOTOGRAPHY. prepared glass, either of which is fastened to the sliding frame by the check Æ. The frame slides along the rod l, i, and can he fixed at the proper focus by means of the step m. n is the gutta percha washing tray, o is an opening in the bottom of the camera near the door, to admit the wellp, and which is closed, when the well is removed, by the door q. The well is divided into two cells, one of winch contains the focussing glass and the other the glass trough, each in a frame adapted to the sliding frame L. On each side of the sliding door that supports the lens a, there is, within the camera, a small hinged table r, supported by a bracket s. These two tables serve to support the bottles that contain the solutions necessary to be applied to the glass plate after its exposure to the lens. Figs. 71 and 72 represent two cases, containing the various instruments and chemical preparations required for the collodion 71. process. 6, fig. 71, is a grooved cell for a series of glass plates. 6 is a receptacle for the lens of the camera, c contains a spirit 72. lamp ; d, a pair of glass measures ; e, a porcelain pestle and mortar. The door y encloses a space containing a funnel with