Ebay:Ship curves set

[BrianY]

Thought this might interest someone here:

A set of Ship Curves

http://cgi.ebay.com/SHIP-CURVES-ANTIQUE-VINTAGE-BOAT-BUILDING-CURVES_W0QQitemZ290370629132QQcmdZViewItemQQptZLH_ DefaultDomain_0?hash=item439b702e0c#ht_500wt_1182


(disclaimer - I have absolutely nothing to do with this auction or seller)

[rbgarr]

Can anyone explain how to interpret the markings on the curves? What do the labels mean?

[Bill Perkins]

Don't know. If the curves are circular I can see how they could be described with that amount of info : one edge being labeled on each face of the template . It would be interesting to know exactly what the man was designing .

[outofthenorm]

They look like railway curves rather than ship curves. Useful, but not as complex as real ship curves. Anyone doing scale train layouts could find use for them.

- Norm

[tomlarkin]

Here are the markings:
http://donutboat.files.wordpress.com/2009/11/image_thumb.png

[outofthenorm]

Full explanation of railway curves (http://www.steamlocomotive.com/model/curve.shtml) here.

An excerpt:
Because of the distances involved, in prototype railroads it would be impractical to measure a curve by its radius. Using the system we use in model railroad would put the center of curvature a great distance from the tracks. Instead, prototype railroads use degrees of curvature, or more precisely "degrees per chain", where a chain is an engineers chain (a unit of distance equal to 100 feet and traditionally measured with a chain).

- Norm

[rbgarr]

Cool!

[BrianY]

Well...you really can learn something new every day! Thanks Norm!

[Cliff B]

Full explanation of railway curves (http://www.steamlocomotive.com/model/curve.shtml) here.

An excerpt:
Because of the distances involved, in prototype railroads it would be impractical to measure a curve by its radius. Using the system we use in model railroad would put the center of curvature a great distance from the tracks. Instead, prototype railroads use degrees of curvature, or more precisely "degrees per chain", where a chain is an engineers chain (a unit of distance equal to 100 feet and traditionally measured with a chain).

- Norm

Out here in Oregon, a chain is a Gunter's chain, or 66 feet, used in surveying. Ten chains are a furlong, or an 1/8 mile.
I converted the speedometer on my Citroen 2CV to read accordingly. At 60mph, it is travelling about 151,000 furlongs per fortnight....which is much more interesting.
Cliff

Cliff

[Tom Robb]

And on a 2CV entirely apropriate too:)

[Lucky Luke]

I converted the speedometer on my Citroen 2CV to read accordingly. At 60mph, it is travelling about 151,000 furlongs per fortnight....which is much more interesting.
Cliff

Cliff

....and how many rods in a chain...?

ARRRRGGHHHHHH!!!!!:eek:

Mum, where is my (French) meter in Platinum-iridium, that I teach this butt-head how to take measurements! (well: he drives a 2CV...so this explains that....let's forgive him this time!)

:D:D:D