It soon became clear that pressures of the order of 10-6 Torr were being reached. But the gauge’s design was attacked repeatedly. Morris Travers, who used it with Ramsay, complained that it was very sensitive to contamination by moisture.
The above quote concerns the Sprengel Pump. I suspect it suffices for a low cost experiment if and only if inlet and outlet cleaning continuously prevents unwanted intruders from entering the pump and the reactor.
One half liter can be evacuated in 20 minutes. Or should I say, it is claimed such a volume etc in twenty.