Inspection And Proof of Cannon
Inspection And Proof of Cannon
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The surface of the head corresponds with a longitudinal, central section of the chamber; at the point where the projection of the vent would meet it a piece of hard wood is inserted. A central line drawn through its length, crossed at a right angle by another line at any known point from the smaller end, will afford convenient points to measure from. A stout square wooden staff is attached to the axis of the head; at a dis- 23 tanco equal to the length of the bore, the end is jogged into the ce...ntre of a half disc of wood, which is fitted to. The bore. The whole is so constructed that the straight edge of the half disc (or the chord) is in the same plane as a horizontal section of the head. A few holes are bored through the disc attached to the half head, to allow the instrument to pass freely into the pm and out of it. ^ A wire of untempered steel of the size of the vent, with a sharp well centred point, and a small spirit level, are required to use with this instrument.
The gun being levelled, and the instrument being pushed to the bottom of the bore, the upper edge of the half disc near the outer end of the staff is then brought to a level.
What to read after Inspection And Proof of Cannon?
You can find similar books in the "Read Also" column, or choose other free books by United States. Navy Dept. Bureau of Ordnance to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
The surface of the head corresponds with a longitudinal, central section of the chamber; at the point where the projection of the vent would meet it a piece of hard wood is inserted. A central line drawn through its length, crossed at a right angle by another line at any known point from the smaller end, will afford convenient points to measure from. A stout square wooden staff is attached to the axis of the head; at a dis- 23 tanco equal to the length of the bore, the end is jogged into the ce...ntre of a half disc of wood, which is fitted to. The bore. The whole is so constructed that the straight edge of the half disc (or the chord) is in the same plane as a horizontal section of the head. A few holes are bored through the disc attached to the half head, to allow the instrument to pass freely into the pm and out of it. ^ A wire of untempered steel of the size of the vent, with a sharp well centred point, and a small spirit level, are required to use with this instrument.
The gun being levelled, and the instrument being pushed to the bottom of the bore, the upper edge of the half disc near the outer end of the staff is then brought to a level.
What to read after Inspection And Proof of Cannon?
You can find similar books in the "Read Also" column, or choose other free books by United States. Navy Dept. Bureau of Ordnance to read onlineMoreLess
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