Groma.

Description:
GROMA (greek., latin groma) is a measuring instrument for fixation of the North-South line by the solstice in the given point, construction of the West-East line and weighting parallels to both lines, which was necessary for marking-out the field camps.

1 — portable instrument with the rotary slat-nozzle (2); 3 — angle cross with the sight thread A-B and C-D rotating around the plumb axis (4); 5 — foundation with the cross drawn on the stone: a-b — longitudinal axis, c-d — diametrical axis of the field camp.

Credits:
© Image, text: Slovar’ antichnosti. / Per. s nem. — M.: Progress, 1989 (to article “Groma”)
RUSSIAN

You can mark the fragmens interesting for you and they will be accessible by the unique link in the address bar of the browser.

THE DATABASE OF ANCIENT ART
Keywords: measuring instrument instruments groma sight thread plummet plumb plumb-line
HISTORY OF ANCIENT ROME