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Ever think of building a Cornu Spiral horn? Now you can!
Ever think of building a Cornu Spiral horn? Now you can!
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Old 12th February 2018, 08:13 PM   #2461
boswald is offline boswald  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Actually, I suspect that Cal and I are old enough to have seen this idea on the nipple of a mucilage bottle in elementary school(or is it sedimentary school-"Settle down, you!").

It's more impressive that we have some memories of such, than that a handy person comes up with it new.
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Old 12th February 2018, 08:45 PM   #2462
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Ahh those memories of mucilage suddenly came back. Rubber flat tipped nipple in the bottle. I never know mucilage is basically plant or animal derived mucous like substance that is edible. Used for postage stamp glue and envelope glue. Hence the requirement that it’s edible. I do not remember a metal two prong tip so Cal still gets credit for this invention.
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Old 12th February 2018, 08:59 PM   #2463
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
I don't remember mucilage but I do remember eating the paper paste with the minty flavour, and the little applicator that doubled as a spoon.

I'm just so glad I didn't use the paper strips this time or I'd still be applying glue instead of waiting for it to dry. It was so fast.
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Old 12th February 2018, 09:37 PM   #2464
boswald is offline boswald  United States
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Ever think of building a Cornu Spiral horn? Now you can!
I remember a slanted rubber tip with a flat notch, thus two squarish points. I think it helped pull the last drop back in. So the patent would have to be for the use of rather than the shape alone. Would still be valid, though, lacking prior use.

Some comedian had a bit about two five-year-olds standing and peeing in the shallow end of the pool "do you eat the paste?" "It's a given". We had a teacher who showed us how to make paste, play-doh, and silly putty.

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Old 12th February 2018, 10:31 PM   #2465
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Hmm... Silly Putty (the rubbery flesh colored non Newtonian fluid) is Dow Corning 3179 Dilatant compound made of silicone. You can make that?
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Old 12th February 2018, 11:49 PM   #2466
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
OK, so back to speakers for a minute.

One done, the other has to wait for a couple days.

Cornu's biggest asset is to take an otherwise good FR and give it bass beyond it's regular means. Doing a Cornu with a woofer and it's own plate amp means there is much better control over things, but unfortunately, the ****s and giggles are all but gone. The drivers have sat in storage for a couple years and need time to stretch their legs. What I can say at this point is there is a room full of bass in the bedroom with no discernible cone movement. I will have more to say later.

The second pic is an option for where they (or maybe just one) can go if it goes well.
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Old 13th February 2018, 12:38 AM   #2467
xrk971 is online now xrk971  United States
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Ever think of building a Cornu Spiral horn? Now you can!
Nice work Cal. It surprises me that foam core can be used to make such a large speaker. I suppose it is quite strong given you have 48 linear feet of it in there like basically a composite honeycomb panel.

What bass Hz are you feeling like it reaches? 30Hz easily?
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Old 13th February 2018, 01:47 AM   #2468
Cal Weldon is offline Cal Weldon  Canada
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Ever think of building a Cornu Spiral horn? Now you can!
Hi X, Not enough time yet to know much about them. More to come later.
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Old 13th February 2018, 09:13 PM   #2469
chrisb is offline chrisb
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Quote:
Originally Posted by xrk971 View Post
Ahh those memories of mucilage suddenly came back. Rubber flat tipped nipple in the bottle. I never know mucilage is basically plant or animal derived mucous like substance that is edible. Used for postage stamp glue and envelope glue. Hence the requirement that itís edible. I do not remember a metal two prong tip so Cal still gets credit for this invention.
this is the one I remember from school (50+ yrs ago )
Click the image to open in full size.
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Old 14th February 2018, 02:26 AM   #2470
scott68 is offline scott68  United States
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Thanks for you encouragement Cal. I started a new thread, "Reversing a Cornu 4 channel horn to a 4 channel T-Line - Advantages?" and I mentioned your Cornu thread as I have learned so much from it. If you have any thoughts on this, I would like to hear them.
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