"The camera consists of a box 4½ inches long, 1-7/8 inches wide, and ¾ of an inch in thickness. The back opens upon hinges, and admits of the introduction of either the ground glass or the plate-holder. On the anterior face a tube 1-1/8 inches long is attached, in the outer end of which the lens is placed. This lens has a focus of 1¼ inches. At the side of the tube a part of the handle of a throat mirror is fixed, and into that the shank of the throat mirror is passed and fastened by a thumb-screw. The shank of the mirror is somewhat curved, and is attached to the side of the frame holding the mirror. The object of this is to allow the lens being held opposite any part of the opening of the mouth, and also to prevent the possibility of a shadow being cast upon the mirror. In the front part of the box is a shutter made of lead and perforated with a hole just the size of the lens. The shutter is held in position by a lever acting as a key on the anterior face of the camera. "The apparatus is used in the following manner: A reflector, either plane or concave, attached to a head band, is arranged over the left eye so that the pencil of sunlight from the solar condenser is received upon it and thrown into the mouth. The patient, with the head inclined slightly backward, now protrudes the tongue and holds it well out between the fore finger and thumb of the right hand. The throat mirror with the camera attached, held in the right hand of the observer, is placed in position in the fauces, and the light adjusted so that the larynx can be seen with the observer's left eye to be well illuminated. If, now, the tongue does not mount above the level of the lower edge of the lens and the lower edge of the mirror, it may be taken for granted that when the plate is exposed the picture received upon it will be nearly the same as that seen with the left eye in the throat mirror. The photograph is taken by pressing upon the key with the index finger; this releases the shutter, which in falling makes an instantaneous exposure amounting to perhaps one-seventh of a second. "In using condensed sunlight with a small camera it is important to throw the circle of light from the inner side of the reflector, that nearest the nose; for in this way a part of the larynx exposed to the lens of the camera may be illuminated which cannot be seen with the eye. To ensure this it is best to cover the outer half of the reflector with black silk. On account of the parallax or displacement of the image due to the difference in point of view between the eye and the camera, some skill is necessary in managing the illumination so that the part which it is desired to bring out will be exposed to the lens if not to the eye." [Footnote 17: _Archives of Laryngology_, vol. iv. No. 4.]