I thought I would post this original one with the instructions as the accessory of the day, since Micheal asked about these in a thread a few back.
Jay what is that for?
Being a Californian, Albert, you can be excused for not knowing. Back in the day, and today still in other parts of the country, there is just a single traffic light high in the center of the intersection, not also at the corners like we have here.
If your car has a low windshield, or a visor, you cannot see the central traffic light without scrunching down when you are close to the intersection. The prism lets you see the light.
Some towns in the South used to have a single fixture with just 3 lamps, so in two directions the green was on top and red on bottom, while it was normal in the other two. A color blind friend got caught by a cop, for using position to guess the color.
Thanks for the info Rick, come to think of it I have seen lights like the ones you describe, I was born in the caribbean and some of the islands have lights suspended from cables that cross in the middle of the intersection high up, they are designed to swing with high winds.
Right after WW II, when cars were hard to buy, new car dealers added all the extras including a visor on each car. Very hard to see traffic lights with the visor blocking the view, So cars all had a similar prism device.
When I was a kid, I had a 52 GMC pickup that had a huge visor on it and you nearly had to lay down in the seat to see a traffic light, or stick your head out the window.
Bruce W. David, was the inventor of the “Signal Viewing Attachment”
in the above photos, which with the use of any suitable transparent
cement could be attached to the inside or outside of the windshield.
However the patent number 1808208 was issued with a change that
eliminated the adhesive mounting method that was apparently blamed
for some windshields cracking.
The upgrade involved using a suction device.
Moonbeam Manufacturing Company
Cleveland Heights, Ohio
Patent number: 1637309
Filing date: Dec 28, 1926
Issue date: Jul 26, 1927
Patent number: 1808208
Filing date: Nov 12, 1928
Issue date: Jun 2, 1931
Patent number: 1902322
Filing date: Oct 20, 1928
Issue date: Mar 21, 1933