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  1. E

    Cannon sight question

    Excellent! This is the information I've been looking for! I owe you one, Claypipe! :bow:
  2. E

    Cannon sight question

    I did not mean "inaccurate" as in "Oh dear, the artillery is so inaccurate that it deviated 90° from the target!" but as in "This cannon's bore is not quite centered, so that a measurement error of +/- .25° in elevation does not make that much of a difference."
  3. E

    Cannon sight question

    Hello Claypipe, not necessarily. Even if you have an offset of an entire inch to the left or right off the center line, you'd still get a fairly accurate reading of the elevation, given the eccentricity of bores in the 17th century. The reading would only deviate in tenths of degrees, which is...
  4. E

    Cannon sight question

    It is right that the plumb bob was probably used to ensure that the sight was at the highest point of the cannon's curvature, thus aligning it (albeit roughly) with the bore. However, that would not explain the 0° to 45° markings on the arc scale. But being that a cannon has the biggest...
  5. E

    Cannon sight question

    This is a 17th century gunner's level and sight: How is this device used? I know that the plumb bob and angle to the right is for measuring the depression/ elevation of the cannon. What I do not understand is the function of the extractable ruler to the left. My best guess is that it is a...
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