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In the carolinian and early middle ages, the sounding horn was beautiful, both in sound and appearance, and essential. From sounding orders in battle to calling together the people to flushing out game to communicating to others far away (which I think is cooler and less addicting than cell phones), the sounding horn was an absolute necessity. According to legend, the well-known knight of Charlemagne, Roland, acquired his famous horn by hewing off the head of a ravaging bull as a mere child!
These horns were made normally of cow or bull horns. They were sometimes carved. The hardness level for horn or bone is 2.5
I wanted a horn like this, so I looked on google and found instead a link to a video on YouTube on how to make a conch shell horn. We had a rather large Queen Conch, so we made that kind of horn instead.
What you do is cut off the tip (where you will blow) so the hole is about the size of a dime in diameter. Then, using a drill, cut (or drill) off some of the spiral- or -knob part directly inside the hole. Then use sandpaper or a file to smooth the edge of the hole. Voila! To sound your horn, press your lips tightly together, with your upper lip slightly further out than your lower one so that the air will come out right at the middle. Now, hold your shell tightly to your lips, and blow. You may make a few spitting noises at first, but keep practicing, you’ll get the hang of it. In case you didn’t understand this, here’s a movie I found on youtube: