What is a Uni Mike?
What is a Uni Mike?
The Uni-Mike micrometers have interchangeable anvils and are used for measuring tubing thickness, rivet head height or shoulder-edge distance. The digital series 317 is IP65 water/dust protected.
Who invented micrometer?
William Gascoigne
Micrometer/Inventors
Who invented Spherometer?
Robert-Aglaé Cauchoix
The first known spherometer was invented by French optician Robert-Aglaé Cauchoix in 1810. They were manufactured starting in the nineteenth century primarily for the use of opticians in grinding lenses and astronomers in grinding lenses and curved mirrors.
What is the least count of vernier caliper?
0.1mm
Least count = Smallest reading on main scaleNumber of divisions on Vernier scale=1mm10 = This is the least count for Vernier Callipers. Hence, the least count for Vernier Callipers is 0.1mm.
What is the reading of micrometer?
The micrometer is an extremely precise measuring instrument; the reading error is 1/200 mm = 0.005 mm. Use the rachet knob (at the far right in the picture above) to close the jaws lightly on the object to be measured. It is not a C-clamp! When the rachet clicks, the jaws are closed sufficiently.
Why does a spherometer have 3 legs?
Spherometers have three legs that form an equilateral triangle. Recall from geometry that three points determine a plane, so the three legs will always touch the glass. In this way a spherometer can measure both a positively or negatively curved surface to high accuracy.
What is H in spherometer?
Measuring the Radius of Curvature of the Concave Surface , the height of central screw above the plane ABC, which is measured by the spherometer (h is called Sagitta.)
What is the meaning of least count?
In the science of measurement, the least count of a measuring instrument is the smallest and accurate value in the measured quantity that can be resolved on the instrument’s scale. A stopwatch used to time a race might resolve down to a hundredth of a second, its least count.
What is the reading of micrometre screw gauge?
That means the final reading of the micrometer screw gauge is 2.30mm. Hence, the correct option is A.