Clear Bore

[Lingon]

...My point was that, with rotaries, you can make the rotor diameter as large as needed to smooth out the turns...

Hmm, didn't think that far. However then the valves has to be really large?

[windshieldbug]

I've always thought that "Clear Bore" was just a marketing ploy, just as was Besson's "Chicago Bore".

Here are some "Clear Bore" instruments without large piston valves:

[Lingon]

I've always thought that "Clear Bore" was just a marketing ploy, just as was Besson's "Chicago Bore".

Hmm, and what is Chicago Bore?

...Here are some "Clear Bore" instruments without large piston valves:...

Ahh, those old instruments are so nice. But the mystery thickens because initially there was talk about Clear Bore and rotary valves, now everything we have seen so far is about pistons, not any rotary yet?!

[windshieldbug]

Hmm, and what is Chicago Bore?

Good question. "Chicago Bore" was apparently embossed on Besson instruments meant for the American Market in the late 19th century in the same place on the bell that "Class A", "Class B" was embossed for horns sold at home.





Class had a meaning for product quality in Great Britain, but "Chicago Bore" horns seem to be otherwise identical.

[Lingon]

..."Chicago Bore" was apparently embossed on Besson instruments meant for the American Market in the late 19th century in the same place on the bell that "Class A", "Class B" was embossed for horns sold at home...

Great, one more piece to the puzzle. It would now be very interesting to really compare two instruments of the same kind from the same period with the different markings. Or if anyone would stumble over some documentation about the matter... I know there are differences between Class A and B but now this Chicago Bore, is it the same as A or B or something else?! And Clear Bore that was a patent for rotary valves which now is found on a couple of piston instruments, but no rotary instrument, yet.