External samples (made by me but belongs to the others collections).
Screw nut in ampoule with Mercury (50 ml).
Discharge tubes with different gases. There is no mercury vapuor inside Ar tube and all gases has purity >99.9%. Samples where made for the University's element collection.
Some photos about making these tubes.
And some interesting demonstration: comparison of luminescence intensity for different gases (at the same current) and spectral lines of Helium (by reflection in the grating).
