What hides this stereogram?
[3674] What hides this stereogram? - Stereogram - 3D Image - #brainteasers #stereogram #3Dimage
BRAIN TEASERS

What hides this stereogram?

Stereogram - 3D Image
#brainteasers #stereogram #3Dimage
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Pain reliever

A man went to the dental surgeon to have a tooth pulled. The dentist pulled out a freezing needle to numb the area.

"No way! No needles! I hate needles," the patient shouted.

The dentist started to hook up the laughing gas and the man again objected.

"I can't do the gas thing!” the man protested. “The thought of having a gas mask on is suffocating to me!"

The dentist then asked if the man had any objection to taking a pill.

"No," the patient said. "I am fine with pills."

The dentist said, "Here is a Viagra tablet."

The patient replied: "Wow! I didn't know Viagra works as a pain pill!"

"It doesn't," said the dentist, "but it will give you something to hold onto when I pull out your tooth."

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Steam percussion rock drill

In 1849, Joseph J. Couch received the first U.S. patent for a steam-powered percussion rock drill (No. 6,237) as “improved machinery for drilling rocks”. It was driven by steam power and acted without need of gravity supplying any part of the motion. A sliding drill support frame enabled it to be operated in any desirable position or direction. Power was supplied by the piston of a steam cylinder connected to a suitable steam generator. The machine would be held stationary as the rotating drill was thrown against the rock. The drill rod would disengaged at each stroke, and travel with its own momentum, so that upon striking the rock, the shock was not transmitted back to the rest of the machine, preventing it from damage. After each blow, the tool was seized by means of friction-grips to retract and repeat.«
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