What is hidden in 3D image?
[1707] What is hidden in 3D image? - Stereogram - 3D Image - #brainteasers #stereogram #3Dimage
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What is hidden in 3D image?

Stereogram - 3D Image
#brainteasers #stereogram #3Dimage
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Back-Up Sensor

Inventor of the automobile back-up Sensor -
I bet you think it was Ford, maybe GM, how about Chrysler? No, then how about Mercedes Benz?
No, not at all, it was a Chinese farmer!
Most of the newest cars have a Back-Up Sensor that warns the driver before the rear bumper actually comes in contact with something. Most people probably think that this valuable feature came out of the minds of great engineers, but it was recently disclosed that the concept was first developed by a Chinese farmer. His invention was simple and effective. It emits a high-pitched squeal when the vehicle backs into something.

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Subway car design

In 1909, the first subway car with side doors in the U.S. was put into service in New York City. The Interborough Rapid Transit Company placed an 8-car train in service from Lenox Avenue to 148th Street. The side doors, positioned four feet from each end of the car, were opened and closed by a pneumatic-lever system. The cars cost $12,000 each. These doors were the invention of James McElroy of the Consolidated Car Heating Company. Although there had been prior instances of trains running underground, when the Interborough Rapid Transit Company opened on 27 Oct 1904, it was the first to establish a rapid transit subway in the U.S.
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