NEW EXPERIMENTS

TRACT 34.

as

The 'Gun n° 4, weighed 928 lb.

The Pendulum as left yesterday. But it was quite'broken and useless at the end of these experiments.

The mean value of i, or point struck these 9 days, 88'6.

The object this day was the effect of firing the charge indifferent parts, either before, or behind, or in the middle :for which the means are as below :

Mean Veloc.

lSi 0> 2, 6 fired before - 2020

3, 7 in the middle - 2124

4, 8 behind - - - 2036

Mean of all - - - - 2060Mean recoil of gun - - 409

5 is omitted as doubtful.

THE EXPERIMENTS OF 1785.

87. Several of the experiments, of the two former years,'being nht so regular as might be Wished, We have againundertaken to repeat some of them, and to add still moreto the stock already obtained, that the mediums upon thewhole may be tolerably exact, the great number of repeti-tions counteracting the unavoidable small irregularities, and' deviations from the truth, in experiments instituted on solarge a scale. For this purpose, we begin with the gun n o 2,and use charges of 8 ounces of powder ; and have formedthe resolution of firing every shot into a fresh and soundpart of the block of wood, and changing the block veryfrequently, before it become too much battered, that the; penetration of the ball and the force of the blow may beobtained with the greater degree of accuracy.

It is also proposed to procure some good ranges, to com-pare them with the initial velocities made under the same

\ circumstances ; from the comparison of which we may esti-

j mate the effects of the resistance of the air, and so lay a

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