Chapter 3 Part 15
With 8 amperes passing, the break works on steadily with a regular ‘ dick-dick’ bruit, but on approaching 12 amperes the sound becomes lower-pitched and laboured, denoting that the coil cannot absorb or utilise the surge of current supplied to it.
We have said that a great potential spark-length is not essential for a good coil for X-ray work; it is, indeed, un- desirable. From a coil emitting very long sparks it is difficult to obtain more than 1 milliampere of current, whereas with the shorter and coarser winding suitable for shorter sparks we may obtain a current of 10 to 15 milliamperes. No tube presently made could stand that current for more than a few seconds, so that alteration of coils in that direction is for the present limited in its utility. Long sparks are correspondingly ‘ thin’ and thready. What is now wanted for general use is a spark of moderate length, but ‘ fatter.
Some recent coils have their primary windings made in separate sections, so that a greater or less length of wire may be put in circuit according to the strength of current supplied to the coil, a shorter length, as represented by a less number of sections, being employed for heavier currents.
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Tom Thym on December 12th 2009 in x-ray
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