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After making some experiments on the air collected at the blower, by bladders which were mounted with tubes of various diameters, he satisfied himself that, when the tube was reduced to a certain diameter, the foul air would not pass through; and he fashioned his slide accordingly, reducing the diameter of the tube until he conceived it was quite safe.
Given an effective magnifying power of five thousand diameters, which will perhaps be possible at the mountain observatories as telescopes improve, and we should be able to bring the moon within an apparent distance of about forty miles, while the corresponding distance for Mars would be more than seven thousand miles.
It would be useless to look for the two fainter companions of delta, discovered by Burnham, even with our five-inch glass. But we shall probably need the five-inch for our next attempt, and it will be well to put on a high power, say three hundred diameters. The star to be examined is the little brilliant dangling below the right-hand end of the Belt, toward Rigel. It appears on the map as eta.
In the present chapter we will assume that the barrels of all the boilers described are made out of solid-drawn seamless copper tubing, which can be bought in all diameters up to 6 inches, and of any one of several thicknesses. Brass tubing is more easily soldered, but not so good to braze, and generally not so strong as copper, other things being equal.
The mistake of an inch it might be several would falsify all my computations, and render them of no use. It would not do to proceed upon such a conjectural basis, and for a while I was puzzled, and had to pause. This was an unexpected obstacle, for I had from the first regarded the diameters as the only difficulty; about the possibility of obtaining the length, I had never entertained a doubt.
He subdued these cities and even imposed the rule of black men on the Berber town of Agades, a rich city of merchants and artificers with stately mansions. In fine Askia, during his reign, conquered and consolidated an empire two thousand miles long by one thousand wide at its greatest diameters; a territory as large as all Europe.
This very primitive apparatus, magnifying some fifty diameters, presented, it is true, only indistinct and imperfect forms, but still sufficiently wonderful to work up my imagination to a preternatural state of excitement.
Make a study of the hygienic ventilation of the schoolroom. Give advantages of full breathing over shallow breathing. How may a flat chest and round shoulders be a cause of consumption? How may these deformities be corrected? Give general directions for applying artificial respiration. Compare the side to side and vertical diameters of the cavity.
"What is the difference," asked Oxenden, "between the two diameters of the earth, the polar and the equatorial? Is it known?" "By Jove!" said Featherstone, "that's the very question I was going to ask. I've always heard that the earth is flattened at the poles, but never knew how much. Is there any way by which people can find out?"
If one considers the vast size of the diameter KL, which according to me is some 24 thousand diameters of the Earth, one will acknowledge the extreme velocity of Light.
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