The bridge spans the Cumberland Basin, an extension of Regents Canal. The elaborate bronze candelabra were part of Scotts original design, but had been damaged by a bomb during the war, and the basin filled with rubble. Inone of Lasduns large windows was removed to make more space in the foyer.
This reminded me of an interesting physics experiment that really helped me back in college to understand the mechanism behind nuclear resonance.
The experiment was described as a note in the American Journal of Physics in Here is the text of that note no figures accompanied it: By far the most intense NMR absorption yet reported is that of the Co59 nucleus in bulk cobalt.
The nuclei precess in this field at No external magnetic field need be applied to the cobalt; a strong external field will in fact destroy the resonance. All that is required to observe the resonance is some powdered cobalt, and a low-powered rf oscillator equipped with a meter which indicates grid current, i.
When energy is absorbed from the tuned circuit of the oscillator by a nearby resonant circuit, the grid current shows a dip. With a model 59 Megacycle Meter,4 the curved end of the tuning hairpin need only be held flat against the bottom of the bottle of cobalt.
As the oscillator is tuned carefully through Nuclei of atoms in the less abundant hexagonal closepacked structure see a slightly larger magnetic field, and therefore resonate at about Mc.
Some weaker resonances are also present, but additional equipment is usually needed to see them. A grid dip meter is normally coupled weakly to the circuit under test, in order to avoid mutual detuning, and the frequency dial is calibrated accordingly. The proximity of the bulk cobalt to the hairpin has two gross effects on the grid dip meter, in addition to providing resonant absorption of nuclear origin.
Thus, to obtain oscillation at The actual frequency has to be measured by standard techniques. The best NMR sensitivity is obtained when oscillation is barely sustained. Only the cobalt resonance is detectable by the means described here.
Letters 3, Why physicists still use Fortran. Posted on July 16, by delton in programming research “I don’t know what the programming language of the year will look like, but I know it will be called FORTRAN.”.
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