Phonograph - Discuss the early process of sound recording, before magnetic tape and cassettes, in which a needle cut a recording on a wax plate. Telegraph - Let someone present a research report on Thomas Edison's early days as a telegrapher. Let someone do a report on Morse code and give a demonstration of it. Graph - Introduce various kinds of graphs in math class. Lithograph - Discuss the process of lithography and talk about Currier and Ives. Their lithographs are still used every year as Christmas cards. make potato or linoleum block prints. Graphite - Have someone research how it is used today. Hologram - Show students a hologram (on a National Geographic cover or on your credit card). Autograph - Have the class write to famous people, requesting an autograph. Phonogram - The Greek word gramma, meaning "letter" or "something written down", comes from graphein. Discuss the invention of the alphabet as an early system of written-down sound.