Monthly Archives: July 2021

Portland cement, electromagnets, the passenger rail, and matches are all inventions I learned this week.  I will explain how all of these inventions have changed history .   Portland cement works as a binder in concrete.  Portland cement is usually mixed with sand and water to form concrete.  Cement is very helpful because concrete would notContinue reading “Week 4 Inventions”

I learned about four inventions this week: the pencil, the stethoscope, the tunneling shield, and paved roads. The pencil is one of the most helpful and simplest inventions.  I learned that it is actually graphite, not lead, in the pencils.  The pencil is made by putting graphite in a wooden case.  It is used byContinue reading “Week 3 Inventions”

I learned about three inventions this week: Vapor-compression, Percussion Ignition, and the Canning Process.   Vapor-compression is what is used in refrigerators.  It works not by blowing in cold air, but by removing the heat in the air.  Then it blows it out into the room.  So without the vapor-compression theory we would not have refrigerators.  Continue reading “Week 2 Inventions”

I learned about suspension bridges, fire hydrants, and locomotives.  I will describe and explain what all these inventions did to help the world evolve.   The suspension bridge is a bridge hung by strong chains or wire.  The suspension bridge was cheap, easy to build, and super strong.  So without the suspension bridge it would beContinue reading “History II Week I Inventions”