Unusual chronograph scales

[adrienbelanger]

I came across this watch on eBay this morning and noticed something I hadn't seen before: a scale on the main dial divided into 20 graduations (see photo below).

I have seen pulsometers and telemetre scales and slide rules etc but can't figure out what this one was designed to measure. Is it perhaps some kind of non-decimal production scale?

It got me thinking, are there any other unusual chronograph scales that we don't see often, and if so, what is their purpose?

 

[Darlinboy]

adrienbelanger

I came across this watch on eBay this morning and noticed something I hadn't seen before: a scale on the main dial divided into 20 graduations (see photo below).

I have seen pulsometers and telemetre scales and slide rules etc but can't figure out what this one was designed to measure. Is it perhaps some kind of non-decimal production scale?

It got me thinking, are there any other unusual chronograph scales that we don't see often, and if so, what is their purpose?

It's not uncommon - that's a telemeter scale in kilometers. 👍

Here's the Speedmaster version...

 

[adrienbelanger]

@Darlinboy, thank you!! I think I was fooled by the absence of the word "telemetre" at 12 o'clock 🤦

 

[MMMD]

The red scale on this Jardur qualifies as unusual. It is used to calculate an airplane's turn in degrees, based on a standard turn rate of 3 degrees/second.

 

[Vitezi]

Of course there's the infamous UG Film Compax thread here:
https://omegaforums.net/threads/film-compax-a-mystery-solved.3587/

 

[Vitezi]

The respirations (breath register) scale seen here is unusual:


(thanks)

 

[MMMD]

Vitezi

The respirations (breath register) scale seen here is unusual...

Good one. Here's another:

Edited: May 30, 2016

 

[Foo2rama]

I was going to post the film one. Just missing the fraction of time bezel. With the 0-100 bezel and for some reason I can't find one.

 

[oddboy]

Vitezi

Of course there's the infamous UG Film Compax thread here:
https://omegaforums.net/threads/film-compax-a-mystery-solved.3587/

cool! where @MMMD got his avatar byline!

 

[Vitezi]

How about a slide rule scale, such as this one:

(thanks)

 

[Vitezi]

Or a decimal scale, such as this one @LouS sold here:

(thanks)

Or here:

(thanks)

 

[citizenrich]

This one came from modest_proposal a couple years ago.

Thanks, David!

 

[JimInOz]

citizenrich

This one came from modest_proposal a couple years ago.

Thanks, David!

Your photography skills are awesome Rich, what equipment do you use to get that blurry effect?

😁

 

[Syrte]

Vitezi

The respirations (breath register) scale seen here is unusual:


(thanks)

5 breaths, very good for yoga.
Great thread idea, by the way

Curious, what's a "decimal scale" and how is it supposed to be used ?

Edited: May 31, 2016

 

[citizenrich]

JimInOz

Your photography skills are awesome Rich, what equipment do you use to get that blurry effect?

😁

Lulzz I used a potato.

I bought that watch from David (Modest_Proposal) on eBay. I had no idea it was him until after I received the watch - he always holds the watch head in his handsomely manicured hand and I recognized his fingers lmao

(I don't think he was as excited as I was when I made the connection). 👎👎👎👎

 

[Foo2rama]

Syrte

Curious, what's a "decimal scale" and how is it supposed to be used ?

Decimal scale is used when you need to know the percentage of a minute. So instead of 30 seconds you have .5 minutes. Science, some navigation, factory timing and a few others.

 

[abrod520]

Foo2rama

Decimal scale is used when you need to know the percentage of a minute. So instead of 30 seconds you have .5 minutes. Science, some navigation, factory timing and a few others.

And rallying / similar competition (sometimes) 👍

 

[danomar]

Here is a sample of the ultra-rare (dare I write prototype?) double-tachy scale designed for people with two automobiles.



It might work with SUVs, too.

😗

 

[Syrte]

Foo2rama

Decimal scale is used when you need to know the percentage of a minute. So instead of 30 seconds you have .5 minutes. Science, some navigation, factory timing and a few others.

Thanks @Foo2rama, I now feel so well informed! (I'm realizing I like toolwatches for their technical looks and often tend to ignore function... )

 

[Bienne2998]

A vintage slide rule chrono