Two-Faced Mirror for Day or Night Motoring (Nov, 1936)
The more modern prismatic version is a bit handier and doesn’t involve driving around with a mirror point out the front of your car. The current auto-dimming mirrors are even better.
Two-Faced Mirror for Day or Night Motoring
One side of a reversible rear-view mirror for automobiles has a crystal-clear face for daytime driving, and the other side is a jet black glareproof mirror that kills the blinding reflections during night driving. Either side provides clear vision of the road to the rear. The mirror is turned and locked in position either way by a simple twist of the wrist, and it can also be held in a vertical position for use as a vanity glass.