25. When a gun or howitzer is aimed with the line of metal horizontal, what is the elevation equal to? The natural angle of sight or dispart. 26. How is the time of flight for siege mortars at an elevation of 45° determined? It is nearly equal to the square root of the range in feet divided by four. [Sidenote: 68]] RANGES OF FIELD GUNS AND HOWITZERS. ==================================================================== KIND OF PIECE. |Powder.| Ball. |Elevation|Range| Remarks. ----------------+-------+---------+---------+-----+----------------- | lbs. | | deg. min| yds.| 6-Pounder Field| 1.25 | Shot | 0 | 318 | Gun. | | “ | 1 | 647 |P. B. Range | | “ | 2 | 867 | | | “ | 3 |1138 | | | “ | 4 |1256 | | | “ | 5 |1523 | +-------+---------+---------+-----+----------------- | 1. |Sph. case| 2 | 650 |Time of flight 2“ | | “ | 2 30 | 840 | do. 3“ | | “ | 3 |1050 | do. 4“ ----------------+-------+---------+---------+-----+----------------- 12-Pounder Field| 2.5 | Shot | 0 | 347 | Gun. | | “ | 1 | 662 |P. B. Range. | | “ | 1 30 | 785 | | | “ | 2 | 909 | | | “ | 3 |1269 | | | “ | 4 |1455 | | | “ | 5 |1663 | +-------+---------+---------+-----+----------------- | 1.5 |Sph. case| 1 | 670 |Time 2 seconds. | | “ | 1 45 | 950 | “ 3 “ | | “ | 2 30 |1250 | “ 4 “ ----------------+-------+---------+---------+-----+----------------- 12-Pounder Field| 1. | Shell | 0 | 195 | Howitzer. | | “ | 1 | 539 | | | “ | 2 | 640 | | | “ | 3 | 847 | | | “ | 4 | 975 | | | “ | 5 |1072 | +-------+---------+---------+-----+----------------- | 0.75 |Sph. case| 2 15 | 485 |Time 2 seconds. | | “ | 3 15 | 715 | “ 3 “ | | “ | 3 45 |1050 | “ 4 “ ----------------+-------+---------+---------+-----+----------------- 24-Pounder Field| 2. | Shell | 0 | 295 | Howitzer. | | “ | 1 | 516 | | | “ | 2 | 793 |