General Knowledge - Inventions - Discussion

Discussion :: Inventions - Section 1 (Q.No.8)


This statesman, politican, scholar, inventor, and one of early presidents of USA invented the swivel chair, the spherical sundial, the moldboard plow, and the cipher wheel.

[A]. George Washington
[B]. Alexander Hamilton
[C]. John Adams
[D]. Thomas Jefferson

Answer: Option D


Thomas Jefferson (April 13, 1743 - July 4, 1826) was the third President of the United States (1801-1809) and the principal author of the Declaration of Independence (1776).

T.Kavitha said: (Aug 10, 2011)  
But declaration of independence was done by benjamin franklin.

Lilu said: (Nov 19, 2015)  
Where is central drug research?

Ziya Sulthana said: (Apr 28, 2016)  
Very nice question.

I really had a good use of it and its a very useful for me. THANKS.

Aftab said: (Jul 21, 2016)  
Good useful question. Please provide more details related to the question.

Netra Vyas said: (Aug 10, 2016)  
But the Cipher Disk was invented by the Italian architect and author Leon Battista Alberti.

Aishwarya said: (Dec 24, 2020)  
Thomas Jefferson created Jefferson disks in the 1790s. Jefferson called his invention the "wheel cypher. ' It had 36 wooden disks, each with 26 letters in random order ("jumbled and without order, ' according to Jefferson) along the edge, like the ridges of a coin. The device was used briefly and then forgotten. Cypher wheels were later independently invented. Jefferson's papers describing his "cypher' were rediscovered in 1922.

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