Page:Popular Science Monthly Volume 12.djvu/183

Rh The lens g can also be removed at h. m is a brass arm having three joints, and fastened to the lamp. At the extremity of this arm is a perforated knob, s, through which the handle of the reflector, i, is passed, and which is fastened by a screw. At o is a single charniére joint, which permits of the forward or backward motion of the reflector—the illuminating agent being oil. By substituting gas burned through an Argand burner, and fed from any ordinary burner, the apparatus has been made more available, and better light obtained. The following cut represents the improved apparatus as now made.



It is not necessary to dwell upon the changes. Suffice it that by these the apparatus has been made much more ready and simple in management, and less liable to derangement of focus at important moments when a steady light is needed for intra-laryngeal operations. It is here that we should call a brief attention to the vast strides which, under the influence of the laryngoscope, have been effected in the operative procedures upon this organ. All of these are now made by means of instruments curved at a direct angle to the line of vision, and in none of these operations does the operator directly see the