The War of the Rebellion: A Compilation of the Official Records of the Union and Confederate Navies. 30 vols. Washington, DC: Government Printing Office, 1874-1922. Reprint, Gettysburg, PA: National Historical Society, 1971.
I like to hang 0.9% NS to gravity when possible because I always thought that the fluids would stop infusing if the IV site blows. A co-worker of mine disagrees and said that IV fluids hung to gravity would continue to flow and infiltrate if an IV site blows.
In open column chromatography, gravity is pulling the solvent down while in HPLC we use a pump to push the solvent with up to 20,000psi of pressure through the column.