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Updated: May 7, 2025
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.
In this instrument the micrometer screw, with a divided circle for turning it, was applied for bringing the micrometer wire actually in line with a division on the circle a plan which is still always adopted. Pond succeeded Maskelyne in 1811, and was the first to use this instrument.
"We may as well take a second, in case this should not turn out quite perfect," he said, as he replaced the cap and closed the shutter. He reversed the dark slide and made another exposure in the same way, and then, having removed the micrometer and replaced it by a slip of plain glass, he made two more exposures. "There are two plates left," he remarked, as he drew out the second dark slide.
For almost an hour Breckenridge sat motionless, his eyes flashing from micrometer screen to signal panel, his sensitive fingers moving the potentiometers through minute arcs because of what he saw upon the screen and in instantaneous response to the flashing, multi-colored lights and tinkling signals of his board.
Moreover, the entire print was covered by a network of fine black lines, by which it was divided into a multitude of small squares, each square being distinguished by a number. "Excellent, Polton," said Thorndyke approvingly; "a most admirable enlargement. You see, Jervis, we have photographed the thumb-print in contact with a numbered micrometer divided into square twelfths of an inch.
I photographed the print with the micrometer in contact and on comparing this with a genuine thumb-print, also photographed with the same micrometer in contact, I found that the suspected print was larger by the fortieth of an inch, from one given point on the ridge-pattern to another given point.
Michel, and a catalogue of Christian Mayer in Latin, which kept me employed when my brother was at the telescope at night. When I found that a hand was sometimes wanted when any particular measures were to be made with the lamp micrometer, or a fire to be kept up, or a dish of coffee necessary during a night's long watching, I undertook with pleasure what others might have thought a hardship."
The new ultra-lights flared instantly along the line automatically laid down by the detector, and upon the closely ruled micrometer screen of Brandon's desk there glowed in natural color the image of a globular space-ship, approaching them with terrific speed. "Men all stationed, of course, Crown?" "Stationed and ready."
He expounded the laws of the motion of the pendulum, increased the power of the telescope, invented the micrometer, discovered the rings and satellites of Saturn, constructed the first pendulum clock, and a machine, called the gunpowder machine, in principle the precursor of the steam engine. For sheer brain power and inventive genius Christian Huyghens was a giant.
The crystals of albite are coated by a red oxide of iron, appearing like a residual substance; and their cleavage-planes also are sometimes separated by excessively fine layers of this oxide, giving to the crystals the appearance of being ruled like a glass micrometer. There was no quartz.
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