Jacob's staff

:For the plant known as the ocotillo, sometimes called the Jacob's staff, see ocotillo.

~ ~ ~ ~ ~ ~ ~ ~ ~ ~

In surveying, the Jacob's staff or cross-staff is a single straight rod or staff, pointed and iron-shod at the bottom, for penetrating the ground. It also has a socket joint at the top, used, instead of a tripod, for supporting a compass.

Related Topics:
Surveying - Compass

~ ~ ~ ~ ~ ~ ~ ~ ~ ~