It is driven round by the water pressure of the 2 side komet nozzles, The top komet nozzles have a 10mm diameter outlet.
There is a particular focus on motorway service stations with poster advertising on the forecourt, pump nozzles and pos in store.
Back pressure and smokebox vacuum could be altered by raising and lower the brass choke positioned between the nozzles.
The nozzles of small lamps are inserted in the tubes L, L, for illuminating the webs in a dark field; the light from these lamps is admitted through apertures in the strong hollow cylinder above mentioned (for illumination, see p. 385).
So use shut-off nozzles or kink the hose when you 're not spraying.