A spectroscope is a device which measures the spectrum of light. Early spectroscopes were simply a prism with graduations marking wavelengths. Modern spectroscopes generally use a diffraction grating, a movable slit and some kind of photodetector[?], all automated and controlled by a computer.
... American swimmer and actor
July 12 - Deng Xiaoping, Chinese politician and leader
July 13 - Pablo Neruda, poet
August 28 - Secondo Campini, Italian jet ...