11. You might investigate this with a stroboscope . 12. They were more powerful than the classical stroboscope , invented in 1891 then in use. 13. Purkyn constructed his own version of a stroboscope which he called " forolyt ". 14. Other systems connect the spindle to a stroboscope , which alternates light and dark upon a photodiode. 15. A stroboscope used to set the ignition timing of internal combustion engines is called a timing light. 16. Advancing the idea of the stroboscope , researchers began using lasers to stop high-speed motion. 17. He is credited with being the first physician to use a laryngeal stroboscope for examination of the larynx. 18. You can find this machine which is called'stroboscope 'in many optician shops . "" 19. The renderer is like a stroboscope , sampling the underlying " reality " periodically and showing the results. 20. And as he delivered his first pitch, the stands became a stroboscope , erupting in a sea of flashbulbs.