This information from the private essay: History 4: lesson 110. Higher Notes Lower Notes Law #1: Shorter Strings Longer Strings Law #2: Tighter Strings Looser Strings Law #3: Lighter Strings Heavier Strings You can make higher notes on a guitar (or any other string instrument) by pressing down on a long string to make the …
Category Archives: History 4
History lesson #110
Lesson 106: Mersenne’s Laws Lesson 107: Cartesian Coordinates Lesson 108: The Mechanical Calculator Lesson 109: Blaise Pascal Mersenne’s Laws in the following table are Mersenne’s laws (one row per law) : Higher Notes Lower Notes Shorter Strings Longer Strings Tighter Strings Looser Strings Lighter Strings Heavier Strings Input / output to make different notes on …
History Lesson #105
Lesson 101: Johannes Kepler Lesson 102: Galileo Galilei Lesson 103: The Slide Rule Lesson 104: John Napier Johannes Kepler Kepler is best known for his three planetary laws of motion. His first two laws are below: The planets moved in elliptical orbits, as opposed to circular orbits. The closer to the sun the planet is, …
History lesson #100
Lesson 96: Compound Microscope Lesson 97: William Gilbert Lesson 98: The Newspaper Lesson 99: The Telescope Compound Microscope The compound microscope uses two lenses to make an image bigger. The bigger lens is nearest the object, and the smaller is the eyepiece. You multiply the magnification power of the first lens by the power of …
History lesson #95
Lesson 91: The Mercator Projection Map Lesson 92: Mercator Lesson 93: Tycho Brahe Lesson 94: The Backstaff The Mercator Projection Map/Mercator The Mercator Projection Map was a good tool for navigating the sea. Mercator also invented the first globe. Both of these were used when Portugal sailed the seas and discovered some new islands. Tycho …
History lesson #90: The Heliocentric Theory, Vesalius, âœï¸And The Pencil âœï¸
Lesson 86: The Heliocentric Theory Lesson 87: Copernicus Lesson 88: Vesalius Lesson 89: âœï¸The Pencil âœï¸ The Heliocentric Theory / Nicolaus Copernicus Nicolaus Copernicus invented the The Heliocentric Theory, and challenged Aristotle’s theory that the Earth is at the center of the universe. Now, into the theory that has been proved out of a theory …
History Lesson #75
The world around the time these tools were invented plays a crucial role in the history of those inventions. Let’s take a look. Before that time, an English man bought a piece of land from the french. That land was called Normandy. So the king of England was also Duke of Normandy. The English wanted …
History lesson: #70
Lesson 66: Spectacles Lesson 67: Mechanical Clocks Lesson 68: Paper Mills Lesson 69: Robert Grosseteste Eye Glasses (Spectacles) Glasses had a BIG impact on history. They allowed scholars to work later into their life. This boosted books production. There was no more fear of getting old. As time went on, until Teddy Roosevelt’s life, glasses …
History Lesson #65
Lesson 61: Buttons Lesson 62: Oil Painting Lesson 63: Cannons Lesson 64: Spinning Wheel Buttons Buttons were invented as a strap to replace pins and brooches. They were made of metal, but, in time, declined to plastic. They started a change in clothing, and became to the strap of the Blue Jeans invented by Levi …
History lesson #60
My Lessons For The Past Week Lesson 56: Trebuchet Lesson 57: Distilled Spirits Lesson 58: Vertical Windmill Lesson 59: Stern-Mounted Rudder Trebuchet The trebuchet is a missile launcher. It uses gravity or other force to launch. Here is how the trebuchet works: 1: men pull ropes or crank a pulley to make force pulling one …