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.

About this Item

Title

Author

Sturmy, Samuel, 1633-1669.

Publication

London :: Printed by E. Cotes for G. Hurlock, W. Fisher, E. Thomas, and D. Page ...,

1669.

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Link to this Item

http://name.umdl.umich.edu/A61915.0001.001

Cite this Item

"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." In the digital collection Early English Books Online 2. https://name.umdl.umich.edu/A61915.0001.001. University of Michigan Library Digital Collections. Accessed June 1, 2024.

Pages

SECT. XIII. How to find what Flaws, Cracks, and Honey-combs are in Pieces of Ordnance.

THere is one good way, as soon as you have discharged a Piece of Ordnance, cover the mouth of the Piece close, and stop the Touch-hole at the instant time; if there be any unknown Cracks or Flaws which go through the Metal, a visible Smoak will come through those Cracks and Flaws; if not, the Gun is not cracked.

There is a way to reflect the Sun-beams when he shineth, with a Looking-glass or Steel in at the hallow Cylinder of the Piece; for by this means a bright and clear light will be within, and by that light you will see every Flaw, Crack, or Honey-comb.

But this way you may see at any time; take a Stick something longer than the Piece, cleave the end of the said Stick, for to hold an end of a Candle, light the Candle, and put it into the cleft end of the Stick, and put it into the Piece; by this light observe by degrees whether from the one end to the other there be any of the foresaid Flaws, Cracks or Honey-combs in the Piece.

This is a usual way likewise, if in striking a Piece upon several places of the Metal with a Hammer of Iron, you shall at any stroak hear a hoarse sound; then without doubt there is Honey-combs: but if in so striking the Piece, you shall at every stroak hear a clear sound, then may you be sure your Piece is clear of any Honey-combs, Cracks, or Flaws.