The mariners magazine, or, Sturmy's mathematical and practical arts containing the description and use of the scale of scales, it being a mathematical ruler, that resolves most mathematical conclusions, and likewise the making and use of the crostaff, quadrant, and the quadrat, nocturnals, and other most useful instruments for all artists and navigators : the art of navigation, resolved geometrically, instrumentally, and by calculation, and by that late excellent invention of logarithms, in the three principal kinds of sailing : with new tables of the longitude and latitude of the most eminent places ... : together with a discourse of the practick part of navigation ..., a new way of surveying land ..., the art of gauging all sorts of vessels ..., the art of dialling by a gnomical scale ... : whereunto is annexed, an abridgment of the penalties and forfeitures, by acts of parliaments appointed, relating to the customs and navigation : also a compendium of fortification, both geometrically and instrumentally / by Capt. Samuel Sturmy.

SECT. XLIII. How to make a perfect Shot at a company of Horse-men, or Foot-men passing by the place where Ordnance doth lie upon a Level-Ground; and also to make a good Shot at a Ship Sailing upon a River.

TAke a Piece that will reach the way or Mark in a Right-Line that the Horse or Foot are to pass by, then your Gun Loaded so with Powder as it may presently take Fire, and Shot fit for that use; and seeing a Tree, Bush, or Hillock, or some turn∣ing cross way for his Mark, and when the Enemies come near to that way in a Right-Line with his Gun, give Fire: and at Shooting at a Ship in a River, he must put his Piece to some evident Mark on the other side the River, and when the Head of the Ship shall begin to be betwix the Piece and the Mark, and then give Fire.