Chatper 2

Source of Supply

THE source of supply of electricity for X-ray work may be one of a number of varying description.

The work to be done will dictate the choice where that is an open one; but more often the choice will be dictated by the factors of convenience and economy relative to the installation under consideration.

Undoubtedly the best method presently available for all- round work in this country is to employ a continuous current of 50 to” 100 volts, and to convert that to the high potential necessary to operate an X-ray tube by passing it through an induction-coil.

We are aware that in America the static machine is the favourite source of supply, and we believe that with some alterations in construction, likely to be introduced at an early date, that machine will find increasing favour in this country, where climatic and other conditions render its use somewhat uncertain in its present forms. The tendency of modern workers to employ softer tubes will also encourage this

Where a supply already exists in some way different from that here recommended, we believe that it is always most satisfactory to convert it into that form.

This may mean initial expense, but, where any serious amount of work is to be done, that will soon be compensated for in convenience and economy of working.

The various sources of supply ordinarily available are: change.

I. The main. This is the most satisfactory source, and may be (1) continuous, (2) alternating.

II. Accumulators.

III. Primary batteries.

IV. Dynamo machine.

V. Static machine.

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