They just did it with a ruler, a pencil, a stopwatch and an echo sounder.
metro.co.uk I had just lost internet access, diary, camera, street directory, watch, calculator, stopwatch, music, social organiser, app store and flashlight.
www.smh.com.au The reverse of the coin shows the legs of a runner and a stopwatch (stopped at 3:59.4).
en.wikipedia.org In the past, using a typewriter, speed was measured with a stopwatch and errors were tallied by hand.
en.wikipedia.org As runners cross the finish line, their time is recorded electronically by a volunteer using a stopwatch that can export data to a computer.
en.wikipedia.org