TubeNet

The boss needs to stop you from coming into the house for lunch! Get to work.

Bloke,

I always enjoy your posts - well "almost always." (that's a New Jersey expression that I picked up as a kid) But I "usually never" use it these days.

You are onto something here. Certainly it is 'compression,' if the slide were pushed in, and the internal atmospheric pressure increased. What would it be called, were the slide drawn and more of a negative atmosphere created? Would that be a 'depression'? or 'expression'?

It does involve pressure, but not necessarily 'compression.' If you do this two or more times, is it then 'repression?" So you do have a point and I believe we need to establish a campaign to re-inform the music instrument world on the vagaries and ambiguitous use of this word. But then perhaps, we also need to get to work clarifying that we do not "breathe from the diaphragm," or "attack notes."

This is just my humble "impression" of things which 'very often never' affects my thinking.

Bloke, you are "priceless." (But that word has subtle and conflicting connotations as well) Ah yes! Another thread.

One other 'Jersey' issue is to give a compliment and then feel compelled to qualify it.
But having lived in the midwest now for over 4o years, I 'pretty much most of the time constantly' feel nostalgic for my home of origin during the holiday season.

Apologies, it's the eggnog, and the preparations for tomorrow night.

PM

PS: My belief is that a Tubist is a type of chemist or lab assistant. Or, perhaps one who worked in the parts department for a television manufacturer. Or, perhaps someone who spent an inordinate amount of time playing with rubber ducks and getting soap in their eyes.

PSS: As of 2016, I would like to here after be referred to by my, until now, secretive nickname, of "MABES." This has been used "usually only" by my closest colleagues, to which I would like now to add all of "yous" here on TN.

Happy New Year!!!!

No, I don't know better and glad for it.
HNY!!!

Dunno what the 'proper' name of the process which causes the tube to "pop" when I yank out the slide 'cept that the teacher always told me to "stop doing that".

I is a sllllloooowww learner.

The Big Ben wrote:Dunno what the 'proper' name of the process which causes the tube to "pop" when I yank out the slide.

That would be a vacuum or an INpression...

Curmudgeon wrote:"Compression" is just a hold-over from engine terms.

Which more generally includes vacuum pressures, like manifold vacuum, if my hasty online education hasn't led me astray. Actually from what I just read about that, I think maybe now I see why my old car's windshield wipers inconveniently tended to slow down when I was trying to accelerate on a steep grade.

As for the terminology, I think "pop" would be OK.

The word "compression" in NOT inaccurate, it is just has a context-limited meaning.

The meaning is clear: the valves don't leak.

One of the points of education is to teach that words have multiple meanings and context is important.

Understanding context allows more rapid communication. The use of the word "compression" allows people to speak in shorthand.

It doesn't, or at least shouldn't, mean that they are ignorant of the other uses of the word.

Hup

hup_d_dup wrote:The meaning is clear: the valves don't leak.

That meaning is clear to you, because you're acquainted with the context it comes from (internal combustion engine diagnostics.) Not everyone has that background. What if "compression" meant trash compactors and bandages? You'd be thinking ... hm, so the springs aren't so strong that you can't push the valves down, but strong enough that they come back up ... is that what he means?

(double post . . . don't know how to delete!)

Donn wrote: That meaning is clear to you, because you're acquainted with the context it comes from (internal combustion engine diagnostics.) Not everyone has that background.

Correct. The word as used is parlance. Not everyone knows everything. An outsider coming in has to learn.

Hopefully the person who is learning comes with enough education to already know the commonly used definition of compression (it doesn't have to be at the level of engine diagnostics), and enough common sense to understand that this is a novel use of the word as it relates to valve leakage.

Parlance is not necessarily inaccurate. Parlance may actually be more acurate when it has a precisely understood meaning among a select group of people.

Hup

Ah! Me thinks me might be on to something here. The test, to which I believe we are referring, usually is commonly termed a "compression test." This involves pumping air into the void under pressure (compression) and measuring how long it takes before it leaks out. So, the purpose of the test is to ascertain the degree of leakage. Unlike a combustion engine, we do not depend on the level of compression to be of assistance in driving the piston with a greater degree of power. The degree of leakage on tuba pistons contributes to the quality of the sound passing through. It would be interesting if we could produce accentuated notes by simply banging the pistons down harder. But it doesn't work that way. In that light, compression is referring to the test itself which employs compression as a means to arrive at a measurement. PHWEW!!!

On a side note - and humorously intended - I have often wondered what it might be like to have the Tubenet "talking heads" or if you prefer the TNFJ all in one room at the same time and able to contribute almost instantaneously to inquiries. I find these posts both extremely entertaining and for the most part, pretty darn informative, or at the very least thought provoking. The term "tuba intelligencia" might be an oxymoron, but this humble site certainly entertains some rather deep thinking folks who enjoy sharing their knowledge and wisdom. I love it.

Mabes

PaulMaybery wrote:On a side note - and humorously intended - I have often wondered what it might be like to have the Tubenet "talking heads" or if you prefer the TNFJ all in one room at the same time and able to contribute almost instantaneously to inquiries.

Well, of course each of them is able to reach out with their Internet tentacles and do just that. The problem is that some also have jobs or are otherwise occupied part of the time, so are unable to attend to Tubenet freak jury duties promptly. What we need is funding to maintain a dedicated paid TNFJ staff.

I could be for investigating forming a DENSA chapter. On the other hand, that might just ruin our little paradigm if we some how manage to legitimize things. Perhaps it might be best if we just all continue to sit at our computers all day in our PJs and Bunny Slippers, vacillating back and forth from Facebook to Tubenet, and occasionally just pissing off someone. Speaking for myself, I've grow quite good at it: Getting folks POed that is.

I have to see the contract first.