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Magusreaver t1_j9fpouv wrote

Reply to comment by jamescookenotthatone in TIL of Macadam roads. These roads were convex, raised a few inches, and made of layered crushed rock; they were state-of-the-art for the 19th century. The rise of automobiles led to the dust issues that were solved by binding the roads with tar, leading to the invention of tarmac. by jamescookenotthatone

my mouth just dried out thinking about that.

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lvl2bard t1_j9g1w3z wrote

They probably didn’t have to check every rock. Maybe every third rock?

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SchtivanTheTrbl t1_j9g3rxw wrote

Just need to check one, then pocket that rock and use it as a template. Bigger than mouth rock? Goes in that pile. Smaller than mouth rock? The other pile over there.

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VeGr-FXVG t1_j9g7zyi wrote

Surely they had to recalibrate the mouth rock occasionally, to see if it still is up to spec?

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