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Updated: May 7, 2025
Smith turned one of them in and out, and said it reminded him of a micrometer gage. Then Billie noted that the entire device was so placed upon the bench as to set directly over a hole, about ten inches in diameter. And under the bench was one of the saddlelike chairs.
Accuracy as to time is absolutely essential in astronomy, but until the invention of Huygens's clock there was no precise, nor even approximately precise, means of measuring short intervals. Huygens was one of the first to adapt the micrometer to the telescope a mechanical device on which all the nice determination of minute distances depends.
With the micrometer," and he raised the lid of a little leather box which stood on the table, took out an instrument of polished steel and applied it to one of the photographs, "we get the angle of these ridges. See how I adjust it," and I watched him, as, with a delicate thumbscrew, he made the needle-like points of the finder coincide with the outside lines of the whorl.
If it comes to a show-down I suppose I shall have to prove my point with the micrometer measurements down to the fifty- thousandth part of an inch. "There is certainly something very curious about these signatures," he concluded. "I don't know what measurements would show, but they are really too good. You know a forged signature may be of two kinds too bad or too good.
Maybe it's a purely mechanical affair that they use for observing. Anyway, old sons, I don't like the looks of things at all. Quince, you're the brains of this outfit shift the massive old intellect into high and tell us what to do." Westfall, staring into the eyepiece of the filar micrometer, finished measuring the apparent size of the heptagon before he turned toward Stevens and Brandon.
Description of a Lamp Micrometer, and the Method of using it. Answers to the Doubts that might be raised to the high magnifying Powers used by Herschel. Phil. Trans., vol. lxxiii. Letter to Sir Joseph Banks on the Name to be given to the new Planet. On the Diameter of the Georgium Sidus, followed by the Description of a Micrometer with luminous or dark Disks.
It was Huygens, together with Malvasia and Auzout, who first applied the micrometer to the telescope, although the inventor of the first micrometer was William Gascoigne, of Yorkshire, about 1636. The micrometer as used in telescopes enables the observer to measure accurately small angular distances.
The eye that directs a needle in the delicate meshes of embroidery will equally well bisect a star with the spider web of the micrometer. Routine observations, too, dull as they are, are less dull than the endless repetition of the same pattern in crochet-work.
If so, when you corrected for E2, which was wrong, it'd throw you all off on P6, which was right, and so on a bad hump at almost every check-station. See?" True to prediction, the pilot ray of P6 came in almost upon the exact center of the micrometer screen, and Breckenridge smiled in relief as he began really to enjoy the trip.
A noted German physiologist spread out a minute drop of blood, under the microscope, in narrow streaks, and counted the globules, and then made a calculation. The counting by the micrometer took him a week.
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