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Dejan Đoša Čović

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last 3 solved tasks
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?
MATH PUZZLE: Can you replace the question mark with a number?

Tintype patent

In 1856, the first U.S. patent for the tintype photographic picture process was issued to Professor Hamilton L. Smith of Gambier, Ohio (No. 14,300), "For the Use of Japanned Metallic Plates in Photography" to obtain "positive impressions upon a japanned surface previously prepared upon an iron or other metallic plate or sheets; and it consists in the use of collodion and a solution of a salt of silver and an ordinary camera." The patent described the preparation of the black varnish, and its application and baking as the japanned surface. Smith had described the chemical developing and fixing process in a previous patent application. Despite the popular "tintype" name, tin was not used. It referred to the thin metallic form of the iron backing.«

A distraught senior citizen ...

A distraught senior citizen phoned her doctor's office. 'Is it true,' she wanted to know, 'that the medication you prescribed has to be taken for the rest of my life?'
'Yes, I'm afraid so,' the doctor told her.
There was a moment of silence before the senior lady replied, 'I'm wondering, then, just how serious is my condition because this prescription is marked 'NO REFILLS'.'
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