Some articles on beam, double beam, double, beams:
... There are two major classes of devices single beam and double beam ... A double beam spectrophotometer compares the light intensity between two light paths, one path containing a reference sample and the other the test sample ... A single beam spectrophotometer measures the relative light intensity of the beam before and after a test sample is inserted ...
... A spectrophotometer can be either single beam or double beam ... In a single beam instrument (such as the Spectronic 20), all of the light passes through the sample cell ... In a double-beam instrument, the light is split into two beams before it reaches the sample ...
Famous quotes containing the words beam and/or double:
“Why beholdest thou the mote that is in thy brothers eye, but considerest not the beam that is in thine own eye?”
—Bible: New Testament Jesus, in Matthew, 7:3.
From the Sermon on the Mount.
“No slavery can be abolished without a double emancipation, and the master will benefit by freedom more than the freed-man.”
—Thomas Henry Huxley (182595)