Part 4453 of 4650 from book70
From the lowest part of my balloon which is hermetically closed issue two tubesbook74 a little distance apart. This much established I proceed to the second partbook30 of my apparatus. Thus you see gentlemen that I can easily effect very considerable changes of equilibrium. The real danger lurks below and not above. Air is infinitely less dense than water in which the ship is only half submerged while the whole bulk of a balloon is plunged in the atmosphere and remains motionless with reference to the element that surrounds it.... more