Gisella's School

This week in history I learned about the vapor compression theory, Oliver Evans, percussion ignition system, and the canning process.            First, the vapor compression theory came when people’s houses got hot in the summer. Imagine walking into a hot house after a long day of work outside. That was why the vapor compression theory was…

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This week I learned about the suspension bridge, the fire hydrant, and the locomotive.                Suspension bridges helped society as a whole because before the suspension      bridge people and carriages had to walk on chains that stretched to each side. When the suspension bridge came around they didn’t have to worry. Here’s why, the suspension bridge…

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