10 Facts illustrative of the 



Tiiese were cast or filled with the same quaUty of iron three 

 liuies succe.ssivclv. The first interval of pouring was ten 

 minutes, and the second fifteen minutes. 



Measured. 

 Inches. 



3-pounder shot, 1st Cast 



2d 



3d 



4 -pounder shot, 1st 



2d 



3d 



C- pounder shot, 1st 



2d . 



3d 



9-pounder shot, 1st 



2d 



3d 



12-poundcr shot, 1st 



2d 



3d 



24-pounder shot, 1st 



2d 



3d 



32-pounder shot, 1st ■ 



2d 



3d 



2-724 

 2-730 

 2-736 

 3-036 

 3-054 

 3-087 

 3-240 

 3-240 

 3-290 

 4-032 

 4-050 

 4-090 

 4-440 

 4-444 

 4-512 

 5-556 

 5-574- 

 5-6G6 

 6-114 

 6-156 

 6-268 



Upon this table I have only to remark, that the ratio of 

 efiect, both in the expansion and increase of weight, is ex- 

 actly analogous to the weight or diameter of the ball, or, in 

 othtr words, to the mass of fluid iron poured into the mould. 

 When the last round of pouring was finished, the moulds 

 possessed a temperature respectively to their sizes. The 

 32-pounder mould was thoroughly red-hot, though nearly 

 two inches in thickness and weighing 140 pounds. In this 

 and in the 24-pounder mould a curious species of adhesion 

 had taken place in the bottom, betwixt the shot and the 

 mould, by the moulders called burning. When the bullet 

 is broken off, the mould exhibits an elevated spongy mass 

 which resists the hardest-tempered steel. 



About two years after the above experiments were made, 

 I paid particular attention to the effects likely to be produced 

 in a large way in the usual train of manufacture. My ob- 

 servations were conducted in a shop appropriated for shot- 

 casting. Tlie length of the house was 30 feet, breadth 16, 

 side walls S feet, with a pavilion roof of the common range. 



The work performed here was the filling of about 150 



pairs 



