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Updated: June 29, 2025
The weighted phial is first to be floated in fresh water, and its line of floatation marked; then to be floated in salt water, and its line of floatation marked; and another mark of an equal height above the salt water mark will be the blow off point. Q. HOW often should boilers be blown off in order to keep them free from incrustation?
They are apt to have a hard time of it, however. I recall one scheme in which a client of mine was interested, involving the floatation of about a hundred thousand dollars' worth of railroad stock.
Formerly wood was employed instead of iron, because wood floats in water and iron sinks; yet now the navies of the world are built of iron; careful thought showed the law of floatation to be that anything could float which, bulk for bulk, is lighter than the mass of liquid displaced by it; and so we now make iron float by the very same law by which it sinks, because by the introduction of the PERSONAL factor, we provide conditions which do not occur spontaneously according to the esoteric maxim that "Nature unaided fails."
We must ask why it goes in the right direction as far as it does and having learnt this we shall then be able to make it go further. The law of floatation was not discovered by contemplating the sinking of things, but by contemplating the floating of things which floated naturally, and then intelligently asking why they did so.
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