. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 244 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. [August, " A cobeorn mortar was placed 100 yards from six new deal targets laid on the ground, and two new nadmill tilts spread out near them, to estimate by the iniprcssion made im tlicm the force with which the balls would fall. The first round was with the usual tin case, containing 33 four ounce-balls, with a charge of one ounce of powder, elevation 45°. The case went bodily about 130 yards without breaking. Loose balls
. The Civil engineer and architect's journal, scientific and railway gazette. Architecture; Civil engineering; Science. 244 THE CIVIL ENGINEER AND ARCHITECTS JOURNAL. [August, " A cobeorn mortar was placed 100 yards from six new deal targets laid on the ground, and two new nadmill tilts spread out near them, to estimate by the iniprcssion made im tlicm the force with which the balls would fall. The first round was with the usual tin case, containing 33 four ounce-balls, with a charge of one ounce of powder, elevation 45°. The case went bodily about 130 yards without breaking. Loose balls were then jut in over a wooden bottom. After a number of rounds with the above charge and elevation, with different numbers of four- ounce balls, it was asccitaintd tlat the cohl-orn would throw 42 of them 100 yards, and that the spread was, on an average, about 10 or 12 yards. It was not very easy to liit the targets and cloths, altliough they covered a surface of 774 square feet; but, in one instance, 22 balls lelt their mark. The indentation on tlje surface of the deal was «o small that it could not well be measured—it ccilainly was not mure than -^^^ of an inch dcfp. A hall thrown with force from the hand appeared to make an (qnal imiression. Those which struck the wadnjill tilt did not penetrate, but merely indented the ground underneath. The penetration of the halls into the ground (hIucIi was of the softest nature of meadow) was, on an average, 2 inches; but the balls thrown by hand did not penetrate so far. The mortar was then elevated to 75^, and with two ounces of powder and 42 balls made nearly the range as before; but the spread was increased to about 40 yards, so that it was difficult to hit the surface aimed at. Several balls did, however, at length fall on the targets and warimill lilts. The im- pression on the former was something still so trifling as hardly to be measured ; the halls did not go through the cloth, and the penetration on the me
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