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B for Bentley slide rule?
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Author:  Tunnel Ling [ Fri Jul 11, 2008 3:33 pm ]
Post subject:  B for Bentley slide rule?
I'm familiar with the traditional Breitling slide rule, but the one on the Bentleys is different.

What does it calculate?
Author:  Sharkmouth [ Mon Jul 14, 2008 2:09 am ]
Post subject: 
I'd be interested in knowing the answer as well. There's enough people on here with Bentleys so someone must know why Breitling used this particular version.

There's a very good page on slide rule wristwatches here http://sliderulewatches.googlepages.com/history.html which notes that the Bentley "uses the C and CI inverted slide rule scales. The inner scale runs left to right, but the outer scale is inverted running right to left, just like the early Breitling manual-wind Chronomats."

But why?
Author:  Driver8 [ Mon Jul 14, 2008 3:03 am ]
Post subject: 
OK, on most of the Bentley models you have a variable tachymeter scale (instead of the more usual slide rule/"flight computer" scale you find on Navis) which enables you to determine average speed whatever the distance covered, the time elapsed or the speed reached. I guess this is more in keeping with the automotive theme of these particular watches.

The manual devotes a fair few pages to the various types of calculation you can perform, but I've not been able to find a link to any kind of softcopy (and I'm not going to type it all out of the manuals! :wink: )

Hope this helps a little.
Author:  Sharkmouth [ Mon Jul 14, 2008 6:34 am ]
Post subject: 
Thanks for the input D8.

Please don't type out the manual - it took me long enough to learn the E6B!
Author:  Tunnel Ling [ Mon Jul 14, 2008 6:17 pm ]
Post subject: 
That sure does help, thanks.

I'm going to take a look at one this weekend.
Author:  Driver8 [ Tue Jul 15, 2008 3:52 am ]
Post subject: 
Tunnel Ling wrote:
That sure does help, thanks.

I'm going to take a look at one this weekend.

No worries. :thumbsup:

If you take a look at one you'll want one! Trust me! :wink:
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