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Updated: June 28, 2025
A distinguished psychologist, who is well acquainted with physiology, has told me that parts of himself are certainly levers, while other parts are probably pulleys, but that after feeling himself carefully all over, he cannot find a wheel anywhere. The wheel, as a mode of movement, is a purely human thing. As a mode of progress, I say, it is unique.
Slowly, at first, then seeming to gather strength and confidence like a young bird that has learned to fly at last, it soared over the apple trees. David, white, but very calm, quietly worked the levers that operated the little engine. When he had risen about a hundred feet, he began to dip and soar around the orchard in circles. He appeared to have forgotten his friends, watching anxiously below.
Even as he spoke the Norton aeroplane was wheeled out again. In a minute Norton had climbed up into his seat and was testing the levers. Would the boy reach him in time? He was half across the field, waving his arms like mad. But apparently Norton and his men were too engrossed in their machine to pay attention. "Good heavens!" exclaimed Craig. "He's going to try it.
After carefully packing these in boxes in order to preserve them from shocks, Place laid them upon their side, having turned them over, by means of levers, against a sloping bank of earth That he afterward dug away in such a manner that the operation was performed without accident.
When the eccentric rod is attached directly to the valve, the radius of the eccentric, which precedes the crank in its revolution, forms with the crank an obtuse angle; but when, by the intervention of levers, the valve has a motion, opposed to that of the eccentric rod, the angle contained by the crank and the radius of the eccentric must be acute, and the eccentric must follow the crank: in other words, with a direct attachment to the valve the eccentric is set more than one fourth of a revolution in advance of the crank, and with an indirect attachment the eccentric is set less than one fourth of a circle behind the crank.
The two men tumbled from the iron apron of the tender as Dyke swung himself up, dropping his pistol on the floor of the cab and reaching with the old instinct for the familiar levers. The great compound hissed and trembled as the steam was released, and the huge drivers stirred, turning slowly on the tracks. But there was a shout.
In the thirteenth century, Philip Augustus, mightier than his predecessors, set to work all the levers of power, in order to move the Pope to divorce him from his wife Ingelburgis.
This class of levers is common in the body. In bending the forearm on the arm, familiarly known as "trying your muscle," the power is supplied by the biceps muscle attached to the radius, the fulcrum is the elbow joint at one end of the lever, and the resistance is the weight of the forearm at the other end. Experiment 22. To illustrate how the muscles use the bones as levers.
By a system of cogs and levers the motor propels a fine steel needle straight through the five feet of books. A glance at this brass dial shows at once how far the needle point has reached.
"Dick," he said earnestly, "if only you'd believe it, the adventures in the Arabian Nights were as nothing compared with the present-day drama of foreign politics. You see, we've learned to conceal things nowadays to smooth them over, to play the part of ordinary citizens to the world while we tug at the underhand levers in our secret moments. Good night! Good luck!"
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