1001 Space Earth Nature History Human World Science and Technology Chemistry Materials Force and Energy Heat and Light Electricity and Magnetism Industry Machines Electronics and Computers Cars and Trucks Railways Ships Aircraft Fishing and Agriculture Undersea Exploration

Choose a Page:How did people pump water in ancie...How does a robot arm work?What is the simplest machine?What is a crawler-transporter used...How does a steam locomotive work?Which were the first machines not ...*How did early gramophones work?*Who invented the motorcar engine?When was the first bicycle made?What are lasers used for?Who invented the jet aeroplane?How do a bicycle's gears work?Is it possible to make a perpetual...How does a roller coaster work? How did early gramophones work? Early gramophones recreated music by revolving a grooved disk, or record, on a turntable. A stylus, or needle, sits in the groove and is vibrated against little bumps. The vibrations picked up are converted back into the original sounds and amplified through a large horn.   Previous: Back Book: 1001 Section: Science and Technology Chapter: Machines