A "'test tube "', also known as a "'culture tube "'or "'sample tube "', is a common piece of laboratory glassware consisting of a finger-like length of glass or clear plastic tubing, open at the top and closed at the bottom.
22.
Concurrently, the neutral analyte molecules of a sample vapor enter the flow tube, via a heated sampling tube, where they meet the precursor ions and may undergo chemical ionization, depending on their chemical properties, such as their proton affinity or ionization energy.
23.
When a sample tube was placed between the first pair of magnets, the torsional force was restored by the current passed through the coil between the second pair of magnets, giving a reading on a display instead of a Helipot ( as was used in the original ).
24.
The sampling tubes were led to the outside of the hot cell, so that sampling could be accomplished without opening the door . ( While this approach to probing gas concentration would be impractical in an industrial vessel, it is a relatively simple procedure in a gas-diffusion system ).
25.
He participated actively in the early planning and design of the lunar geology experiments as a member of the U . S . Geological Survey team sponsored by the National Aeronautics and Space Administration, and he initiated the idea of a sampling tube to be driven into the lunar soil, which became nicknamed the Hoov Tube .
