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I would recommend that these measurement be made in a standard location using a digital micrometer like the one pictured below. A standard measuring tape won't have enough accuracy.



This is one availible through Harbor Freight at http://www.harborfreight.com/4-inch-dig ... 47256.html

Wade, would you like the length of an F contrabone to compare with valved cimbassi, F tubas,...?

It's nearly impossible to measure lengths of open bugles by running a tape along side of the tubing and 'guessing' with regard to what the centerline of the tube might be through various twists and turns.

However... I have a NARROW steel tape measure that I run through the INSIDE of things like leadpipes and rotor sections. It's a pretty good way to approximate the centerline measure that way. I've never tried it with a piston cluster but I suppose it could be done just as easily.

Here's a website that may address some of the issues of straight tubes vs. tapers... http://www.phys.unsw.edu.au/jw/brassaco ... html#bells

djwpe wrote:Intrigued, I took a crack at measuring my british baritone (Besson 955 3 valve comp 2nd valve bore 0.568") and my euph (Sterling Virtuoso 4valve comp 2nd valve bore 0.621").

The conventional place of measurement is the inside bore of the 2nd slide male branch. Two makers do not adhere to this convention in their advertising, Willson and Sterling. They measure the outside diameter of the 2nd slide male branch.

I have a very strong suspicion you went the Willson & Sterling way in your measurements. Otherwise your 955 would have a bore larger than the Conn 24/25I, which I would tend to doubt.

Klaus

imperialbari wrote:

djwpe wrote:Intrigued, I took a crack at measuring my british baritone (Besson 955 3 valve comp 2nd valve bore 0.568") and my euph (Sterling Virtuoso 4valve comp 2nd valve bore 0.621").

The conventional place of measurement is the inside bore of the 2nd slide male branch. Two makers do not adhere to this convention in their advertising, Willson and Sterling. They measure the outside diameter of the 2nd slide male branch.

I have a very strong suspicion you went the Willson & Sterling way in your measurements. Otherwise your 955 would have a bore larger than the Conn 24/25I, which I would tend to doubt.

Klaus

It sure looks that way -- just checked the specs for the Besson 955 here:

http://www.wwbw.com/Besson-BE955-Sovere ... 40006.wwbw

Bore: .547-inch

the elephant wrote:I do not care about bore size at all for this thread, folks. Zero interest in bore. Nada. Zip. Just open horn LENGTH.

Length. Length. Length.

(And did I say length?)

I'd say you went to great lengths to mention length ...

As far as top and bottom bows (and other curved sections) are concerned, getting the centerline length should be easy:

• measure the "outer" length
  measure the "inner" length
  add the two lengths together
  divide by 2

Just a matter of knowing mouse speed and then some good timing:

the elephant wrote:

imperialbari wrote:Just a matter of knowing mouse speed and then some good timing:

We have no mice, but we do have curiosity...

"No cats were harmed during the measuring of this instrument ..."