Autoscopy of the larynx and the trachea : (direct examination without mirror) . rs. A simple forehead-lamp which gives direct,unreflected light meets all requirements as longas we do not wish to examine the deeper por-tions of comparatively narrow cavities; but itis not well adapted to autoscopy or to anteriorrhinoscopy, because in these cases the axis ofour vision cannot coincide with the axis ofthe rays of light; so that either the one or theother falls obliquely upon the parts to be illu-minated, and thus a clear view of the deep por-tions is impossible. All the demands of laryngological an
Autoscopy of the larynx and the trachea : (direct examination without mirror) . rs. A simple forehead-lamp which gives direct,unreflected light meets all requirements as longas we do not wish to examine the deeper por-tions of comparatively narrow cavities; but itis not well adapted to autoscopy or to anteriorrhinoscopy, because in these cases the axis ofour vision cannot coincide with the axis ofthe rays of light; so that either the one or theother falls obliquely upon the parts to be illu-minated, and thus a clear view of the deep por-tions is impossible. All the demands of laryngological and rhi-nological technique, inclusive of autoscopy, aremet by a forehead-lamp for reflected light in-vented by me (Fig. 2), in which the rays of the 12 AUTOSCOPY. electric light, after they have been collected bya convex lens, are deflected at a right angle,immediately on issuing from the lens, by asmall plain mirror {S) placed at an angle of45 degrees to it. The mirror is perforated ob-liquely through its centre for the eye of theobserver. The latter need pay no attention to. Fig. 2.—Fouehead-I^amp for Reflected Light. the angle at which the mirror is placed, but isguided solely by a longitudinal disc of tin (0)placed vertically behind the mirror (between itand the eye), and which is also one can look through both perforations,the axis of vision coincides, of necessity, withthe centre of the bundle of light-rays,—an ideal THE TECHNIQUE. 13 condition for the purposes of vision. The lamp(L) is attached to the head-band by means oftwo joints {h and a) in such a way that any de-sired motion within the widest possible limitscan be carried out with the least amount offorce, and so that the lamp remains fixed inany given position. The lamp is moved fromone position to another by grasping the lowerborder of the perforated tin disc. This latterserves also to protect the observer from theheat of the lamp. A current interrupter {A E)is attached to the cord. For the spe
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Keywords: ., bo, bookcentury1800, bookdecade1890, bookidautoscopyoflaryn00kirs
