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.
TYPES OF PERFORMANCE SPECIFICATIONS. While the emphasis in this guide is primarily on defense and program-unique specifications covered by MIL-STD-961, Defense and Program-Unique Specifications Format and Content, there are other types of performances specifications that will be addressed in this chapter.