A text-book of diseases of the nose and throat (1904)
Kyle, David Braden, 1863-1916 · Philadelphia ; New York ; London : W.B. Saunders · leaf 40
nimum, thereby adding to thecomfort of both the patient and physician. Fig. 9 shows one ofthe most convenient of such batteries. While other lights are good, some expensive and complicated, 30 ILLUMINATION AND EXAMINATION 31 others inexpensive and uncomplicated, those described will answerfor all… … Fig. 9.—Portable battery and electric light. The bulb is protected by a hood, with anaperture as desired. ing in diameter from 3 to 4| inches, with a focal distance of from8 to 15 inches. The reflector should have a central aperturewhich may be placed before the eye of the observer, enabling himto…
