Ferree, Clarence Errol, Rand, Gertrude, b.1886 · New York, etc. · leaf 19
arm for all positions of that arm, prevent overheating, the housing is well the two arms are fastened together at ventilated by especially designed light- the center of rotation. About the source tight ventilators, four in the sloping roof is a housing which was designed in of the lamp house and… … Fig. 3. — Perimeter with arc and lamp swung ob- -Perimeter with illuiniiiating lamp above and Fig. 2. liquely. Arms for mapping 'Central scotoma and target upon the arc. sights detached. tion of the lamp house for filtering the perimeter arm. This housing is made of light to daylight quality. This…
Ophthalmology · Vision · Color vision
Internet Archive · University of California Libraries · Public domain (published before 1931). Free to use for anything.
