Improved mortars of liquid compasses, used to govern ships and airplanes en route (Machine-translation by Google Translate, not legally binding)

摘要

Improved mortars of liquid magnifying compasses, used to govern ships and en route airplanes, characterized, that in the upper part of the mortar and by means of a brass ring and the corresponding screws, there is a cover constituted by a transparent pumped glass, in the form of a spherical cap, with the diameter and height of the arrow variable in relation to that of the sphere. Said transparent pumped glass, covers the mixture of distilled water and alcohol, with which, when combined, produces the effect of increase in the compass route. (Machine-translation by Google Translate, not legally binding)