The Highland Boundary Fault : Reverse or Wrench Fault?
DETAILED work which I have done in the Loch Lomond area suggests a definite answer to the above problem which is of some importance since it concerns one of the major geological features of the British Isles. The direction in which the principal stress acted in the production of the fault can be approximately determined from the pattern of structures in the Lower Old Red Sandstone conglomerates, and this supports the contention put forward in stratigraphical accounts (summarized by J. G. C. Anderson1) that the Highland Boundary Fault is a reverse fault of Caledonian age and not a Proto-Armorican wrench fault as envisaged by E. M. Anderson2.
A Negative Ion Source using a Mercury Pool Cathode
NEGATIVE ion sources are now being used extensively in nuclear research. The demands from these sources are more rigorous than for their positive ion counter-part, and lives are around 100 h for hydrogen, much less for oxygen. Experiments in which the filament of the ion source has been replaced by a mercury cathode (Fig. 1) have given much larger currents (up to 700-amp pulse) and lives. With hydrogen beams, after 600 h operation the source showed only slight wear on the electrodes and indicated an indefinitely long life, while tests with oxygen and with sulphur beams, each for 300 h, indicated no difficulties. These tests were under conditions which gave magnetically analysed ion beams of H−, 15 µamp; of O−, 15 µamp; and of S−, 8µamp;
Prevalence of Headache Within a College Student Population: A Preliminary Analysis
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