« Vitr. 8.5 | Vitr. 8.5 | Vitr. 8.6 | About This Work »
2But if the wind obstructs the operation, and the lines are put in motion, so that one cannot judge by them, let a channel be cut on the top of the rod five feet long, one inch wide, and half an inch high, and let water be poured into it; if the water touch each extremity of the channel equally, it is known to be level. When the chorobates is thus adjusted level, the declivity may be ascertained.
« Vitr. 8.5 | Vitr. 8.5 | Vitr. 8.6 | About This Work »