The first extensive telegraph network was the visual telegraph. In 1791 the Frenchman Claude Chappe used a visual network (which consisted of a telescope, a clock, a codebook, and black and white panels) to send a message ten miles.
Page Content. The School Performance Profile provides the public with a comprehensive overview of student academic performance in every Pennsylvania public school building, including traditional public schools, charter schools, cyber charter schools and career and technology centers.
An overview is a general summary of something. An overview gives the big picture, while leaving out the minor details. If you take a class on American history, the class will be an overview: it will sum up the most important events that have happened, such as famous elections, national disasters, major wars, and economic trends. When writing an overview, you have to leave out a lot of details, because you're focusing on major points.