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History 05 Lesson 30
Platform scale- Who invented it? Thaddeus Fairbanks. When was it invented? 1857. Where was it invented? Johnsbury, Vermont. How does it work? A platform scale is a scale that measures the weight of objects loaded on a flat platform. The function of the platform is to transmit the weight of the object to the internal measuringContinue reading “History 05 Lesson 30”
History 05 Lesson 20
Portland cement- Who invented it? Joseph Aspdin. When was it invented? 1824. Where was Portland cement invented? Britain. How does Portland cement work? Portland cement is the basic ingredient of concrete. Concrete is formed when portland cement creates a paste with water that binds with sand and rock to harden. These ingredients, when heated at highContinue reading “History 05 Lesson 20”
History 05 Lesson 15
The Pencil- Who invented it? Nicholas-Jacques Conte. When was it invented? 1795. Where was it invented? Nuremburg, Germany. How does is work? Graphite molecules are flat groups of carbon atoms that are stacked in layers. The layers slide against each other and allow the lead to slide off the pencil point and onto the paper. When youContinue reading “History 05 Lesson 15”
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