It may be used afloat under favourable circumstances (the observer and artificial horizon being placed on a pendulum table).
In making such observations an artificial horizon must be used.
He tipped a lever, watched the artificial horizon tilt slightly.
His artificial horizon had been arranged but a short distance away.
Murdaugh, always active and efficient, had his artificial horizon ready upon the ice, and gave us an approximate latitude.
Shortly before noon a halt was called, the artificial horizon set up, and the flags and sledge standards displayed.
But what about the image of the sun upon the artificial horizon?
He went below into his room, secured the old 226 log of the M.C. Burns and the artificial horizon.
His sextant, artificial horizon, thermometer, and compasses were carried apart.
The instruments used in taking observations for latitude may be either a sextant and an artificial horizon, or a small theodolite.