| 摘要 |
563,419. Reflex lights. BRACKENSEY, A. H., and FRANCO-BRITISH ELECTRICAL CO., Ltd. April 27, 1943, No. 6646. [Class 97 (i)] The ratio of the radius r of the spherical rear surface 2 to the overall length l of a reflex light having a paraboloidal or ellipsoidal front surface 3 lies between .625 to .980 and .625 to .998. The rear surface may be silvered, or a metal plate having a polished face may be arranged against or near to it.
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