Would you mind bringing me out a prismatic compass, and a pound of Raven Mixture.
And, by the way, why in Heaven's name 'a prismatic compass'?
The trouble was overcome by building snow-mounds and taking back-angles to them with the prismatic compass.
On all the hills in this neighbourhood the local attraction is so great that the prismatic compass is useless.
Round his person are slung field glasses, a prismatic compass, an empty haversack, and a gas helmet.
It therefore seemed to Abdul Mujid only a wise precaution to get rid of his prismatic compass as speedily as possible.
Officers carried revolvers, field glasses, prismatic compass, and various other extras.
He took his bearings with the prismatic compass, and he reckoned his distance by the mean values obtained from three men pacing.
Leather cases and straps for theodolite, circle, and prismatic compass.
Meanwhile, Tatum had been reading a round of angles with the prismatic compass.