Chronometric Rune

LoneStar · Post by **LoneStar** » Tue Mar 25, 2008 1:33 am

The chronometric speedo I purchased for my '54 18S has arrived, and after bead blasting the stamped diagram on the case is more clearly visible. I've seen these on many Smiths chronometric speedos:

http://www.vincent-hrd.co.uk/images/smiths_rune.jpg

Does anyone know what the purpose is, and what the position of the two dots indicates?

Cheers,

Dave

Eric · Post by **Eric** » Tue Mar 25, 2008 8:28 am

This is a guess rather than than statement of fact it maybe a form of date stamp that shows month and year of manufacture but without any scale shown so that only Smiths and those in the know would be able to interpret it.

Circlip · Post by **Circlip** » Tue Mar 25, 2008 9:07 am

Or an indication of its ratio!!

That showed 7-11

Im guessing too by the way.

Say 11 RPM =7MPH

Biscuit · Post by **Biscuit** » Tue Mar 25, 2008 10:12 am

Doesn't answer your query, but may be of interest.
http://www.mc-albion.dk/AMC/Technical/S ... 4-1958.pdf

Locust · Post by **Locust** » Tue Mar 25, 2008 2:21 pm

Alan
You don't have the speedo data for the 1958 on models do you .???
Graham

Biscuit · Post by **Biscuit** » Tue Mar 25, 2008 2:35 pm

Sorry Graham, I only know what's on that site, I not aware of any other source.

Rick.Edwards · Post by **Rick.Edwards** » Tue Mar 25, 2008 7:02 pm

I am sure it is manufacturing data,as type and purpose is on the main face,ratio is on gearbox.

matman · Post by **matman** » Tue Mar 25, 2008 11:13 pm

Looking at Dave´s picture, there is one mark exceeding the outer circle, to my opinion marking the '12'.

The first spot, positioned in the outer circle, marks the '3' then(counting clockwise). The inner spot is marking the '10'.
Couldn´t that be a production date of October 1953? And wouldn´t that correspond with 1954 as the year of production (which started in late 1953)?