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A trumpet is made of 5 feet of brass tubing. They lay a template on a brass sheet and cut it out. A manually operated machine forms a perfect fold down the middle then they notch the edges, Next they close up the bell by hammering the notched pieces onto the opposite edge. They fill the entire bell with a soapy liquid and freeze it. When the solution is frozen the bell goes into a bending block, the frozen solution provides counter pressure providing the brass from buckling in. The soap is mixed in with the liquid so when the pressure is added, the ice doesn't shatter. After the bend is made the bell is defrosted.
In another department the smaller pieces are assembled for the trumpet. After polishing the brass, the trumpet is tested for sound quality.
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