| 释义 |
Lummer-Brodhun sight box Lummer-Brodhun sight box[′lu̇m·ər ′brȯd‚hu̇n ′sīt ‚bäks] (optics) A device, having a series of prisms, for viewing simultaneously the two sides of a white diffuse plaster screen illuminated by light sources whose luminous intensities are being compared. |