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Yes; they must either make, or procure, copies of the
OF ASCERTAINING THE
STRENGTH OF THE SPRINGS OF A LOCK.
1. The least weight that, attached to the comb of the cock, when the lock is at half-cock, will just move the cock.
2. Between 13 and 14lbs.
3. About 7 lbs.
4. By attaching such a weight to the arm of the sear —when the lock is at its bearings—as will just lift it, or overbalance the sear-spring.
5. When the hammer is in a position, as if resting on the nipple.
6. Between 13 and 14lbs.
7. By attaching such a weight to the arm of the sear, when the lock is at full-cock, as will raise the sear-nose out of the full-bent, and allow the hammer to fall.
8. From 7 to 8lbs. ; and it is ascertained by attaching such a weight to the trigger, when the lock is at full-cock, as will cause the hammer to fall.
9. Because, with the trigger its blade acts as a lever on the arm of the sear, and consequently not nearly so much force is required.
10. The steel-yard.
1. That point in the trajectory, where either Infantry or Cavalry respectively first come within contact of the path of the bullet.
2. The dangerous space, or that portion of the trajectory in any part of which an infantry or cavalry soldier respectively would be hit: for instance, in the trajectory of 400 yards, the "margin for " Cavalry is 180 yards; i. e., in any part of the last 180 yards in this trajectory, the cavalry soldier would be hit.
3. By subtracting the "first catch" from the "first graze."
4. For Cavalry, 8 feet 6 inches; and for Infantry, 6 feet.
5. It is the highest point that the bullet is from the ground in its course.
6. As the range increases, so does the culminating point become more distant from the muzzle.
7. It means that, in every part of these trajectories, both Cavalry and Infantry are under the range of the bullet; in fact, that throughout its course both Infantry and Cavalry would be hit.
8. Four feet six inches.
10. Five feet four inches.
11. It is at 280 yards.
12. Seven feet.
13. It is at 370 yards.
15. The whole course of the bullet is a "dangerous space" for Cavalry.
16. It is at 225 yards.
17. It is 145 yards.
WEIGHTS AND DIMENSIONS OF ARMS, &c.
1. Ten pounds, and a quarter of an ounce.
4. Four feet, seven inches, and an eighth.
5. Long stocked; the short stocked ones are an inch
6. One foot five inches.
7. Thirteen ounces.
8. Four ounces.
9. Four pounds, four ounces.
10. Three feet, three inches.
11. 577 inch.
12. 027 inch.
14. 262 inch.
15. From 005 inch (at the muzzle), to 015 inch (at the breech).
17. When they gradually increase in depth from one end of the barrel to the other.
18. One turn in 6 feet, 6 inches.
19. A plug bullet.
20. Five hundred and thirty grains.
21. 55 inch.
22. 1.09 inch.
23. Two and a half drachms.
24. Five pounds, eight ounces, and four drachms.
THE MEAN DEVIATION.
1. It should be large enough to make it probable that all the shots fired will hit it.
3. Yes; for, otherwise, it would not be a fair trial as to the deviation of the shots.
4. Each shot is to be marked off in a diagram, according to its position on the target.
5. Horizontally, from the left of the target.
6. By adding all the horizontal measurements, and dividing the total by the number of hits.
7. No; it would answer just as well to take them from the right.
8. By measuring it perpendicularly from the bottom of the target.
9. The total of the perpendicular measurements being divided by the number of hits.
11. A " measurement is simply the distance of one point from another; a mean measurement" is an average of a number of these " measurements."
12. It is the intersection of the mean horizontal measurement, and of the mean vertical measurement.
13. Its actual distance from the "point of mean impact," and is ascertained by measurement.
14. By adding together the absolute deviation of every shot-including that allowed for missesi-and dividing the total by the number of shots fired.
15. A circle, from the point of mean impact as a centre, and with the mean absolute deviation as a radius.
16. The merit of each arm tried, &c.
17. By measurement.
18. The error due to wind and defective sighting.
19. Half the diagonal of the target.
20. As the mark is fixed on the centre of the target, it is presumed that a miss would not have gone much beyond the edge of the target.
21. In the column, "absolute deviation."