History 5th Grade

I learned about pencils this week. The British had these pencils which were called quilts and everybody in Europe wanted better pencils than the British, the germans tried creating better pencils but they couldn’t but then the Napoleonic wars one of Napoleon’s inventors called Conte created the Conte pencil by mixing clay and ink together.…

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Portland Cement-The development of modern Portland cement began in 1756, when John Smeaton experimented with combinations of different limestones and additives, including trass and pozzolanas, relating to the planned construction of a lighthouse, now known as Smeaton’s Tower. In the late 18th century, the Roman cement was developed and patented in 1796 by James Parker.…

Pencil-A pencil is a writing implement or art medium constructed of a narrow, solid pigment core inside a protective casing which prevents the core from being broken or leaving marks on the user’s hand during use. Most pencil cores are made of graphite mixed with a clay binder which leaves grey or black marks that…

Vapor-Compression-Theory-In 1805, an American inventor Oliver Evans described a closed Vapor-Compression refrigeration cycle for the production of ice by ether vacuum. Heat would be removed from the envirment by recycling refrigerant where it would move through a compressor and a condenser and would eventually revert to a liquid. Oliver Evans-Was an american inventor engineer and…

Suspension Bridges-The earliest suspension bridges were ropes slung across chasm with a deck possibly at the same level or below the ropes. James Finley is widely recognized as the first designer and builder of the modern day suspension bridge. The main forces in a suspension bridge of any type are tension in the cables and…

The Sewing machine is something that changed history. The sewing machine was something that made sewing easier. Back then before sewing machines, sewing would take hours house wives used to sew for hour and hours but now they could sew for one hour and a half. Some people didn’t even have to sew anymore because…