A study on the chromatographic behaviours of codeine, morphine, papaverine, narcotine, cannabidiol, tetrahydrocannbinol, cannbinol and diacetyl morphine on wide bore capillary column in presented.
Air hole, burnthrough, cooapse and welding crackle occurred in the fixed overhead weld for aluminium and aluminium alloy tubes, above all the small-size thin wall tube.
The Baritone is similar to the Euphonium in terms of shape, pitch and range, except that the larger bore of the Euphonium gives its lower notes a broader and mellower timbre.