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Updated: May 3, 2025
"I'm hanged if I see how you fix it so definitely," said the superintendent, who had been following the other's deductions with interest. "The pool of water may have collected at any time, once the window was open." "My dear Galloway, you are working on the rule-of-thumb deduction that the rain blew in the open window and formed the pool. As a matter of fact, it did nothing of the kind.
On the other hand, so completely are the rule-of-thumb ideas still dominant that the writer has never met a single shovel contractor to whom it had ever even occurred that there was such a thing as the science of shoveling. This science is so elementary as to be almost self-evident. For a first-class shoveler there is a given shovel load at which he will do his biggest day's work.
I became furiously interested in the work, for it has ever been my happy fortune to be intent on whatever I might be doing at the moment. I think I served my uncle well, for I had much of the merchant's aptitude, and the eye to discern far-away profits. He liked my boldness, for I was impatient of the rule-of-thumb ways of some of our fellow-traders.
Could you have believed it do you believe it?... He'd made a nearish guess when he'd said that much of our knowledge is giving names to things we know nothing about; only rule-of-thumb Physics thinks everything's explained in the Manual; and you've always got to remember one thing: You can call it Force or what you like, but it's a certainty that things, solid things of wood and iron and stone, would explode, just go off in a puff into space, if it wasn't for something just as inexplicable as that that Rooum said he felt in his own person.
But these questions of predisposition and consequence are too great to argue here, though even the most rule-of-thumb village practitioner, with a black draught in one hand and a pot of ointment in the other, will agree that they admit of a wide application. At least it is to these primary principles over and above my technical skill that I attribute my success while I was successful.
There are people of both races who, while they do not on the whole oppose Hampton and Tuskegee in their educational methods, are honestly afraid that, because of the growing importance and influence of these two schools and others of a similar kind, the idea will be thoroughly established that the Negro needs only and is capable only of the narrowest sort of industrial training such as is represented by the "rule-of-thumb carpenter" and the "one-suspender mule-driver," who work by rule and rote rather than by principle and method, not in the slightest degree comprehending the science underlying the work in which they are engaged, whose mathematical knowledge is bounded by "the distance between two corn or cotton rows."
He had to judge the heating temperatures. It was a hit-or-miss operation. The wonder is that he hit so often. The heat treatment in the hardening of steel is highly important providing one knows exactly the right heat to apply. That cannot be known by rule-of-thumb. It has to be measured. We introduced a system by which the man at the furnace has nothing at all to do with the heat.
Modern engineering can almost be called an exact science; each year removes it further from guess work and from rule-of-thumb methods and establishes it more firmly upon the foundation of fixed principles.
They had no well drawn out formulae to work upon as we have, but they went at things in a sort of rule-of-thumb, rough-and-ready style, and when one party had dragged the country into the mire, the other dragged it out again.
And it was found on studying the rule-of-thumb plan at the Bethlehem Steel Company, where each shoveler owned his own shovel, that he would frequently go from shoveling ore, with a load of about 30 pounds per shovel, to handling rice coal, with a load on the same shovel of less than 4 pounds.
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