Across
- 4. Which is a method of graphic tracing of the electric current generated by heart muscle during a heartbeat, first developed by Dutch physiologist Willem Einthoven in 1903?
- 6. Which diagnostic imaging method uses a low-dose beam of X-rays that crosses the body in a single plane at many different angles?
- 7. In 1914 the world’s first two electric traffic lights were installed in which American city?
Down
- 1. Which electrostatic dry-copying process, invented by Chester F. Carlson, was used to quickly create reproductions of documents?
- 2. In 1908 Swiss chemist Jacques E. Brandenberger designed a machine for continuous production of which strong transparent film?
- 3. In the 1940s Swiss engineer George de Mestral saw tiny hooks on the burrs clinging to his hunting jacket and invented the hook-and-loop fastener system known as what?
- 5. Which was the first practical color photography process, introduced in France in 1907 by Auguste and Louis Lumière?