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. XXVIII. To make Powder of divers Colours, and first to make White Powder.

TAke of Salt-peter 12 parts, of Brimstone two parts, and of Camphir one part, beat, and sift, and incorporate all these things together; and after you have so done, beat them again, and so oft until you are sure they are well incorporated, then moisten it with Aqua Vitae; and when you have thus done, corn the Powder, as you are taught before.

To make Red Powder.

Take the same things, and work them as before directed for White Powder, and as that was moistned with Aqua Vitae, now you must moisten this with Vineagar, being Red as Blood, which will make the Powder likewise so in moistening of it, and then corn it, as is before taught.

To make any Coloured Powder.

Boil the Vineagar in such transparent Colours as you would have the Powder to be of, as if Blew with Blew Bice, of Green with a little Verdigreace, and the like: always take care that the Colour be not too thick, but very thin, or else it will weaken the Powder that you do make.