Answer:
1.The great clock is exactly that, great. It was a big clock invented by Thomas Jefferson.That's about it... he made a giant clock for his workers that hung at Monticello with massive chains extending to the floor. When the clock struck certain times, a massive gong would ring that could reportedly be heard from three miles away.What makes this clock Thomas Jefferson's own invention was that he designed the mechanics himself in a way that hadn't been done before.
2.The wheel cipher was a helpful tool developed by Jefferson for encoding messages with ease. It was a small circular device that had 36 wooden disks on a spindle. Each disk had letters of the alphabet in different orders. When arranged in different patterns, you could create a "key" and inscribe messages under a set cipher.
3 he did invent something called a polygraph. If you take a moment and think about the root of that word, you can determine that it means poly -many- and graph -writings or results.These roots combined come out to describe a device that creates many writings. . This meant that as someone wrote a note or a letter to someone, they could simultaneously write a copy with little effort. This would help the sender maintain proper documentation and aide in communication.
4.In 1525 a french engineer Jean Fernel invented a small device that was able to count people's steps. Even before him, Leonardo da Vinci created a device that dropped stones into a bucket on set intervals to count distance. Jefferson's contribution to the history of the pedometer involved largely improving on current designs and taking learnings from existing devices. In many different history books, he is credited as creating an improved pedometer design.
Explanation:
