Part, §

1 Exp    |   power with which the air is pressing upon the area of the piston
2 Exp    | rushing into the cylinder and pressing the great beam upwards,
3   I,  1|     realises that the air was pressing on these half-globes with
4   I,  3|      three strong men who are pressing their shoulders with all
5   I,  3|     of all the three said men pressing upon the same;-Now this
6   I,  6|   weight of the atmosphere is pressing the piston down at every
7 III, 46|   brought to bear, pushing or pressing, -- or the force of the