The ratchet is a device which applies a pressure by slipping at a predetermined torque and thus prevents the spindle from moving further.
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the inventor of micrometer screw gauge is William Gascoigne.
a micrometer is a very accurate measurement tool, good advantage for precise work-0.01mm increments. they are limited in range IE 0-25mm, 25-50mm, 50-75mm etc so selecting correct size range and screwing up to size adjustment can be time consuming- say if you are constantly changing from 5mm to say18mm means lots of winding in and out major disadvantage is i use them at work - so means I'm AT work major advantage is i make my parts "on size" so i can still go to work tomorrow.
1.By vernier-callipers. 2.By screw gauge. 3.By milimeter scale.
A metre scale measures upto one millimetre.In order to measure lengths less than one millimeter a vernier callipers or screw gauge is used.
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