We calculate, however, the maximum duty of a single engine as the minimum duty of two connected engines of tbe same average power and supplied with a full amount of steam.
The load in both cases is, perhaps, more than should be attached.  We calculate, however, the maximum duty of a single engine as the minimum duty of two connected engines of tbe same average power and supplied with a full amount of steam.  A 40 horse-power engine will not lift more than 6000 pounds 300 feet high per minute, without great strain, running at 50 revolutions per minute.