I want to know the answer to the following question:
Where in the bulb is evaporated tungsten deposited when a vacuum is used?
All the background I'm provided with is that "When a filling of inert gas is used, the evaporated tungsten is carried in the thermal convection currents of the gas, depositing preferentially on the uppermost part of the envelope and blackening just that portion of the envelope.". Is that enough to answer the question?
Answer: no