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Old 28 March 2008, 10:28 AM   #1
Tools
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Reading Your Bezel......Tachymetre/Telemeter

The Tachymeter or Tachometer bezel on your Chronograph is a simple calculator for determining approximate speed in MPH/KPH, or determining a simple rate of production.

For speed estimates, you need a measured mile or kilometer. As the object you want to time enters one point on the measure (milepost) start the stopwatch function of your chronograph. When it reaches the next milepost, stop the second hand. An estimate of mph is read off the bezel.

Here is an example. The time to travel the measured mile took 20.2 seconds or ~179 mph



Rate of production can also be determined. If you are watching an assembly line, or timing an event (say chugging a bottle of water), you start the timer at the beginning of the event. You stop after the end of the event, or when another product comes off the assembly line.

Using our example above; if 1 widget was made during the 20 seconds timed, then 179 widgets are being produced per hour. Or you are chugging a bottle of water at the rate of 179 bottles per hour.

There are more than one type of bezel or scale available for a chronograph. Some are marked with a Telemeter bezel. In the case of our next example below, it is the red scale. When a visual cue at a distance is observed, the timer is started. The timer is stopped when an audible cue that corresponds to the observation is heard. The approximate distance is read off the scale.

Using our example below let's say that a lightning strike is observed, and then the event is timed until the thunderclap is heard. In this case, ~36 seconds, and our scale is calibrated in kilometers, so reading off the telemeter scale, distance is slightly over 12 kilometers away.

In a military application, you can see the flash of the artillary, time the event until you hear the sound, and be able to know the approximate distance away the artillary is placed.



One last type of bezel encountered is the decimal bezel. This is easily identified because it is calibrated from 1 to 100, Using this bezel, time is read off the bezel in tenths, or hundreds of a minute.. If you time an event and the second hand is stopped at exactly 30 seconds, the decimal bezel would reflect .50 of a minute.
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Old 28 March 2008, 11:06 AM   #2
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My first Omega arrived today, and your timely post (ahem) now enables me to use her properly.

Thank you!!


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Old 28 March 2008, 01:54 PM   #3
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Excellent post, Larry. Thank you.
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Old 27 July 2008, 03:47 AM   #4
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Another great article, and very useful too but aren't we forgetting another member of the Speedy bezel family?

Here's my 1967 cal 321 Speedy with a Pulsations or Doctor's bezel. It is used to measure heart-rate by recording the time it takes for 15 heart-beats. The watch is stopped after the 15th beat and the equivalent BPM is displayed.

What do you reckon to this one?

Cheers - Simon
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Old 28 August 2008, 11:29 AM   #5
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nice information!
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Old 28 August 2008, 12:17 PM   #6
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Omega also produced a Decimal bezel for the Speedy as shown in this 1970 example.

This bezel was handy if you were interested in knowing hundredths of a minute..

For example; 15 seconds would be 25 hundredths of a minute, or in the case of this photo, the second hand is stopped at 22 seconds, which equals 37 hundredths of a minute.

Speedy Decimal.jpg

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Old 11 October 2008, 10:37 PM   #7
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My vintage Speedy Pro manual provides this info regarding all four bezels:




The telemetric bezel was used as an artillery range finder. The chrono hand was started upon a muzzle flash and stopped when the shot was heard. The scale then revealed the range.

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Old 3 December 2008, 10:54 PM   #8
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This is a very interesting and informative thread! Thanks guys! Cheers, Bill P.
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Old 23 December 2008, 04:54 AM   #9
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Hi Larry

Great posting and info. I have been wondering how it all worked

Si
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Old 23 December 2008, 07:24 AM   #10
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All very good and informative information, Guys. Thanks for posting.
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Old 9 March 2009, 05:19 AM   #11
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good info.. thx
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Old 7 April 2009, 05:21 AM   #12
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I never even thought about using Tachymetre. For me, it was always about the look-factor. But great article, I learned a few things just then.
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Old 22 September 2009, 07:11 AM   #13
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Good thread. I have learned something today.
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Old 22 September 2009, 07:23 AM   #14
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thanks for sharing
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Old 22 September 2009, 11:09 AM   #15
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Thanks for the post and info, always wanted to know!
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Old 22 September 2009, 11:16 AM   #16
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Thank you Larry....as always!!!
You never let us down
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Old 23 September 2009, 03:59 AM   #17
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I went to Jared's yesterday to look at them first hand. I was very impressed with Omega and they felt solid. I used the chrono function for the first time while shopping and I knew how to use the bezel.
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Old 23 September 2009, 05:02 AM   #18
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Quote:
Originally Posted by DadsWatch72 View Post
I went to Jared's yesterday to look at them first hand. I was very impressed with Omega and they felt solid. I used the chrono function for the first time while shopping and I knew how to use the bezel.
Omega truly does make a nice, hefty watch indeed Very useful topic here for those new to this feature
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Old 9 April 2010, 03:35 AM   #19
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Useful information. Thanks

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Old 9 April 2010, 05:08 AM   #20
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The telemetric bezel appears to be a useful tool to use when you're in need of it.
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Old 2 January 2011, 11:04 PM   #21
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Thanks Larry. I just got my 3570 2 days ago. Very helpful.


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Old 20 February 2011, 12:13 PM   #22
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Excellent post !
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Old 1 May 2011, 02:18 AM   #23
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Great posts - never thought of it in terms of manufacturing product - which is what I do!!! Duh.... Now I don't have to use my cell phone.... lol....
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Old 6 May 2011, 02:13 PM   #24
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I am embarrassed to say, I have owned 2 Daytona's & had no idea what the bezel was used for... now I know, thanx!!!
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Old 3 August 2011, 09:03 AM   #25
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Heart Rate Readings

Quote:
Originally Posted by Gurmot View Post
Another great article, and very useful too but aren't we forgetting another member of the Speedy bezel family?

Here's my 1967 cal 321 Speedy with a Pulsations or Doctor's bezel. It is used to measure heart-rate by recording the time it takes for 15 heart-beats. The watch is stopped after the 15th beat and the equivalent BPM is displayed.

What do you reckon to this one?

Cheers - Simon
Does under 40 mean the patient is dead? No readings lower!
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Old 23 February 2012, 11:09 AM   #26
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Quote:
Originally Posted by Tools View Post
Omega also produced a Decimal bezel for the Speedy as shown in this 1970 example.

This bezel was handy if you were interested in knowing hundredths of a minute..

For example; 15 seconds would be 25 hundredths of a minute, or in the case of this photo, the second hand is stopped at 22 seconds, which equals 37 hundredths of a minute.

Attachment 38048

O MY I love this watch...
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Old 28 March 2012, 10:37 PM   #27
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i own 2 Omega Speedy (a Pro and a Triple Date), 3 Tudor Tiger till now and I just found out today how to read the tachymetre bezel (never felt the need to know before), and I just thought they look cool on these watches since most of my dive watches are the normal 60 units bezel.

I get to know something new everyday.
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Old 17 April 2012, 12:39 AM   #28
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Nice post
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Old 6 May 2012, 05:07 AM   #29
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Is it possible to have a decimal bezel installed during factory service? Mine is under warranty, and needs regulation. It will probably get a new crystal installed, so this would be the best time to do the swap.

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Old 9 May 2012, 02:58 AM   #30
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Nice, real nice
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