Students will examine primary sources including letters, a patent, photos, and diagrams to identify and describe the technological invention and development of the telegraph that evolved during the nineteenth century.
Prior to 1830, communication across the country was limited to overland mail, which took approximately a month to reach its destination, or by the pony express, which...
During the time of the American Revolution, much of the land in the colonies was not mapped. In his early years, George Washington was a surveyor and measured land to figure out the location of property.
Rope or string measuring 10- to 12-feet long
Stakes—if working on grass
Tape—colored if possible
Graph, centimeter, or one-inch grid...
Benjamin Franklin was a scientist and an inventor. As he got older, he noticed he needed glasses for reading and seeing things far away. Franklin solved this problem by inventing bifocals, which were glasses made with two different lenses, one for seeing things up close, and the other for seeing things far away.
Water acts just like corrective lenses made of plastic or glass. The water refracts or changes the direction of a light beam. A water lens is known as a convex lens because it curves out in the middle....