This experiment shows that charges can flow through the vacuum - as long as one terminal is heated and that this heated terminal is a cathode.Now switch on the filament with a positive voltage on the collection plate.In reality, with the filament not glowing, there will be no current for any p.d. then feign concern when there is no current. You could try a bit of drama here by building up the possibility of getting a big current to flow through the vacuum with a big enough p.d. With the filament heater switched off, try a big positive potential difference (p.d.) and then a big negative p.d.Read our standard health
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