stationary sieve
21List of United States inventions — 1700s1731 Sextant * The sextant is an astronomical instrument that is used to determine latitude for navigation. It does this by measuring angular distances, like the altitude of the sun, moon and stars. The sextant was invented independently in… …
22Lemon squeezer — A lemon squeezer is a small kitchen utensil designed to extract juice from lemons or other citrus fruits such as oranges, grapefruit, or lime. It is designed to separate and crush the pulp of the fruit in a way that is easy to operate. Lemon… …
23plant — plantable, adj. plantless, adj. plantlike, adj. /plant, plahnt/, n. 1. any member of the kingdom Plantae, comprising multicellular organisms that typically produce their own food from inorganic matter by the process of photosynthesis and that… …
24Nitrogen generator — Nitrogen generators and stations are stationary or mobile air to nitrogen production complexes. In advanced economies, membrane nitrogen plants have almost ousted alternative processes of nitrogen generation in all cases where nitrogen is not… …
25gel filtration chromatography — gel permeation chromatography a type of chromatography in which the stationary phase consists of gel forming hydrophilic beads containing pores of an accurately controlled size. As the sample is carried through the gel, small molecules are… …
