What is a Tachymeter ?
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What is a Tachymeter ?
Tachymeter is a bezel around the wrist watch on a clock. Tachymeter
is a very accurate grading on your clock that can give the number of
events happening per hour if you know how much time it takes for a
single event to happen. Convesely, if you know the exact time an event
takes to happen once then you can find out how many such events can
happen in one hour. The tachymeter bezel is graduated in such a way that
by just glancing at the tachymeter reading against the seconds needle
tells you these two data. Tachymeter is an amazing piece of instrument
that comes with your wrist watches and clocks. Wrist watches fitted with
tachymeter costs many times a normal wrist watch. Tachymeter adds to the
beauty and sophistacation of your wrist watch in addition to being higly
useful to every one going about their daily routine life.
How Tachymeter on a Clock Work?
Tachymeter works on a simple principle of t/3600. Here t is the time
taken by any event to happen in seconds. 3600 is the number os seconds
in one hour (60x60=3600) To give an example, you are driving your car at
say 60 kmph. The time taken to cover 1 km will be 1 minute. If you are
driving your car at 60 miles per hour then you take 1 minute to cover
one mile. I hope that was simple enough. No consider you are driving at
95 kmph and how many seconds will it take to cover one km? Looking at
the tachymeter it is very simple to find out. Just look at the figure 95
written on the tachymeter bezel and read out the seconds corresponding
to it which is 38 seconds. This is how a tachymeter works.
Second Method to Learn How Tachymeter Work
Now consider you start your stop watch and find out that you have
covered one mile in 38 seconds, then do you know your car speed if the
speedometer is not working? Once again look at your tachymeter bezel and
see 95 written against 38 seconds. Since you covered one mile in 38
seconds your speed as per tachymeter is 95 miles per hour. This is how
tachymeter works on a wrist watch. In a glance you know your speed and
distance covered. This is how tachymeter works.
Check Your Car Speedometer Accuracy with Tachymeter
It is possible to check the accuracy of your car speedometer by using
the same principle on which the tachymeter works. Drive at a constant
speed between two points exactly 1 km if your speedometer is graduated
in kmph or 1 mile if it is graduated in mph. Start the stop clock when
you cross the first marker and stop the clock when you cross the second
market one km or one mile away. Now if the tachymeter reads the correct
speed you were driving your car at.
If the speed you were maintaining
when doing this experiment is not same as what the tachymeter is telling
you then your car speedometer is wrong and needs to be caliberated or
replaced. Before you go to your car dealer see that you do this
experiment a few more times at various speeds and after filling the
correct air pressure in your car tyres. If the readings on the
speedometer of your car and the tachymeter on your wrist watch do not
match then you need to get your speedometer changed because your
tachymeter is never wrong and this is how tachymeter works.
