This enabled the gun to be layed from some little distance behind, so that the layer could be clear of recoil, and continuous laying was thus possible.
Our run is against the house and has a sloping roof, made of wooden beams with polycarbonate roofing layed on top.
Minor improvements in tangent sights certainly were made, notably an automatic clamp, but quadrant elevation was mainly used, and in the case of guns equipped with position-finders (see Range-Finder) the guns could be layed for direction by means, of a graduated arc on the emplacement and a pointer on the mounting.
Otherwise the method would return false indicating the View s are layed out in ascending order.
Owing to the conical shape of the early muzzle-loading guns, if one trunnion were higher than the other, the " line of metal " would no longer be in the same vertical plane as the axis; in consequence of this, if a gun with, say, one wheel higher than the other were layed by this line, the axis would point off the target to the side of the lower wheel.