Drawing the liquid through the tube of an aspirator is another possible resort for the professional man.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
I concluded that further delay to a free opening was useless; consequently with the patient lying on his right side, and near the edge of the bed, I made an opening one inch long in the lower portion of the abscess,-for I now considered it one,-near the spot where the needle of the aspirator and the trocar had been previously introduced.
"Report on Surgery to the Santa Clara County Medical Society"
Joseph Bradford Cox
Another form of aspirator draws the gas from the flue in a constant stream, thus insuring a fresh supply for each sample.
"Steam, Its Generation and Use"
Babcock & Wilcox Co.