Useless Facts, Badly Drawn #439: Gyrotheodolite.
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#gryotheodolite #gps #navigation #subterranean #tunnelling #digging #chunnel #engineering #gyroscopes #intertialnavigation #funfacts #didyouknow #webcomic #comics #uselessfacts #uselessfactsbadlydrawn

Useless Facts, Badly Drawn #439: Gyrotheodolite.
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.
#gryotheodolite #gps #navigation #subterranean #tunnelling #digging #chunnel #engineering #gyroscopes #intertialnavigation #funfacts #didyouknow #webcomic #comics #uselessfacts #uselessfactsbadlydrawn