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Length is the measurement of distance from one point to another.
The standard unit of length is a metre [m].
Other units include;-
– Kg, cm,
– Mm, dm etc
1km = 1000m
1m = 1000mm
Convert as required
34m = 34 x 1000
1 km = 1000m
1m = 1/1000
34m = 1/1000 x 34
1km = 1,000,000mm
10.04km = 1004/100 x 1,000,000
10.04km = 1004/100 x 1000
520m = 520 x 1000
520/1000 X 520m
INSTRUMENTS USED TO MEASURE LENGTH
– Tape measure
– Meter rule
– Vermeer caliper
– Micrometer screw gauge
THE METER RULE
It is used to measure straight lines, widths and heights of objects.
When using a meter rule;-
Take readings from position B, where the eye is vertically above the mark.
When meaning length of curved objects, a string of thread will be used;
THE MICROMETER SCREW GAUGE
This is used for measuring very small lengths such as the width of a meter rule, the diameter of a wire e.t.c
Reading is taken to the second decimal place of a millimeter [mm]. The object whose length is to be measure in fitted between the anvil and spindle by adjusting the rate let.
Before using a micrometer screw gauge;-
I – Wipe the faces of the anvil and spindle to remove any dirt particles that may cause false readings.
II – incase of any zero error, he zero reading must be checked, corrected and correction made in the
HOW TO USE A MICROMETER SCREW GAUGE
The object is placed between the spindle and the anvil while turning thimble.
When the spindle gets very close to the object, the ratchet is turned until a click is heard
There are two reading to take;-
– sleeve reading
– Thimble reading
Each division on the thimble represents 0.01mm on a 100 divisions micro meter screw gauge. It is accurate to 3 decimal places in cm or 2 decimal places in millimeters
This is adjusted to touch the two ends of an object, and then transferred to a ruler
The venier caliper consists of two scales;-
i- Centimeter scale
ii- Millimeter scale
The scale on the form is normally in cm, while that on the sliding jaw consists of 10 divisions in mm.
The venier caliper is used where a ruler may not be used e.g measuring the inner and outer diameters of round objects like a beaker, a tube , the thickness of a table e.t.c
When reading the veneir caliper, two sets of reading are considered;-
i- Reading on the main scale
ii- Reading on the venier scale
Two points on the vernier scale should be used to correct the right reading;-
i- The zero mark
ii- The point where a mark on the vernier scale coincides with the mark on the main scale
READINGS ON THE MICROMETER SCREW GAUGE
White down the readings show below
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