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This instrument is offered primarily to meet the demand for an ophthalmoscope that can be carried conveniently in one's pocket without a box or case. It consists of a frame with two arms, which swing on a hinge-joint. The arms carry two mirrors, which are so placed that when the instrument is closed, the mirrors lie face to face, and are thus protected from injury and dirt. When the instrument is open one arm acts as a handle for the other. In the joint there is a spring bolt, which fastens the joint tightly when the mirrors lie face to face, and also locks the joint when the instrument is open; this spring bolt is loosened by pressing a little knob. The arms are nickel-plated; on the outside this plating has a high polish, on the inside it has a dull finish, so that this metal part will not reflect
PUSEY B. A NEW OPTHALMOSCOPE, COMBINED WITH WHICH THERE IS A PLANE MIRROR FOR RETINOSCOPY; INTENDED AS A POCKET INSTRUMENT FOR OPHTHALMOLOGISTS AND PRACTITIONERS.. JAMA. 1901;XXXVII(25):1691. doi:10.1001/jama.1901.62470510036015