Vermes
Advanced Member level 4
These lamps are used for experiments showing: discharges in gases, electron movement in vacuum. To do such thing earlier an inducer and some appropriate lamp would be needed, which are not cheep things and not quite small. Those lamps are small, therefore easy to be taken from home to a school, for example.
The first two lamps are: the “Maltese Cross” and the fluorescent lamp with a screen.
Size of this lamps: length 40mm, width in the broadest place 25mm and in the narrowest 13mm.
The size, phosphor screens and filling (low pressure neon) makes the supply voltage relatively small (maximum 3.5kV) with a low current drawn. Low energy electrons in those lamps pose no risk of harmful X-rays (as in the old ones).
To fund the lamps, a supply from a flash with a suitable diode-capacitor multiplier. So that the lamps can be powered by simple batteries type AA.
Link to original thread – Miniaturowe lampy dydaktyczne