9'2 



■c 

 o 



X 



■5 a 



o c 

 I* 



PHILOSOPHICAL TRANSACTIONS. 



[anno 1781. 



N°43 

 44 

 45 

 46 



47 

 48 



49 

 50 

 51 

 52 

 53 

 54 

 55 

 56 

 57 

 58 



59 

 60 

 6i 

 62 

 63 

 64 

 65 

 66 

 67 

 68 



69 

 70 



71 

 72 

 73 

 74 

 75 

 76 

 77 

 78 

 79 

 80 

 81 



82 



83 

 84 

 85 

 86 

 87 



The 

 charge of 

 powder. 



J3 



so 



Grs 



90 

 290 



330 



18 



45 



145 



In. 



E 

 o 



2 <o 

 EJg 



a a 



111. 



1.3 



1.3 



2.6 





 1.3 

 1.3 



2.6 

 

 



1.3 

 



1.3 

 



Grs, 



90 

 251 

 354 



eg a 

 a 



.5 -o 



Inches, 



6.5 



6.75 



6.6 



6.4 



6.3 



7.2 



7.4 



7.3 



7.4 



7.6 



7.25 



7.5 



7.4 



7-1 



7.4 



131 



1.2 



1.16 



0.6 



8. 



8.5 



7.2 



7.7 



8.4 



8. 



6.82 



6.6 



6.85 



5.5 



5.3 



3.2 

 4.35 

 3.3 

 4.2 



1.33 

 2.82 

 3.32 



S a 



.2 a 



wra 



Inches, 



64.0 



64.5 



64.9 



6 1.6 



62. 



63.5 



64.6 



63. 



64. 



6l. 



62.3 



64. 



62.2 



6'4. 



63. 

 65. 

 59-5 

 65. 



6*. 

 64.6 



65. 

 0'4.6 



63.6 

 63.4 



62.2 

 63.2 



61.2 



o 

 -a 

 O 



Inches. 



18.3 

 1 8.3.5 



18.1 



22.58 



22.92 



22.38 



23.21 



23.76 



23.0" 



23.26 



23.56 

 11.12 

 1 1 .62 

 9.6'2 

 11.33 

 26.4 



25.3 



26.35 



25.8 



19.56 



18.2 



19.12 



16.33 



S.72 



8. 44 



8.17 



9-3 



13.25 



13.25 



8.92 



1 1 .68 



9.83 

 11.45 



15.25 



14.35 

 4.5 

 7.16 

 .9.62 



11.3 



o j-> 



.. n 



£>a= 



P 



Ft in 

 sec, 



1248 

 1299 

 1265 

 1 293 

 1266 

 141-1 

 1455 

 1412 

 1476 

 152P, 

 1483 

 1502 

 1450 

 1433 

 1454 



1599 

 1652 

 156'2 

 1495 

 |633 

 1556 

 1349 

 1291 

 1345 

 1 080 



103? 

 1044 



1763 

 1317 

 1130 



Remarks. 



► Medium velocity 1276. 



> Medium velocity 1427. 



> Medium velocity 1493. 



> Medium velocity 1460. 



In these 4 experts, the piece was fired 



■ with powder alone, and the screen was 

 I taken away from before the pendulum. 



■ 6th day; medium velocity 1625. 



■ Medium velocity 1328. 



• Medium velocity 1 594. 



The powder was rammed very hard. 

 Ditto much harder. 

 Ditto as hard as in N° 68. 

 Ditto ditto. 



Government powder, no bullet. 

 Best double Battle powder. 

 Government powder. 

 Double Battle powder. 



> 7 tli day; medium velocity 1040. 



20 grs. best alkaline salt of tartar. 

 20 grs. asthiops mineral. 

 20 grs. sal ammoniac 

 20 grs. fine brass dust. 



. The screws which held the hooks by which the 

 J pendulum was suspended gave way, and the pen- 



t dulum came down. 



"1 8 Uj day; in each of these 4 experiments, 

 ( from 50 to 70 granula- or particles of un- 

 ( fired powder were driven through the 

 J screen. 



