Wonderful strides are being made in the development of X-ray photo. graphy—or "radiography," og the expert calls it. It is now possibi to take an instantaneous X-ray photograph of, say, the human heart, at a speed of 1-100th of a second. Things cannot merely be photographed, but actually seen and carefully studied with the naked eye. Most people know that defects in the joints of timber and similar soft substances can lie made visible by this means, but very few people are aware of what can be done with a hard metal like steel. It is possible to-day, with a very powerful X-ray apparatus, actually to see right through no dons, than three inches of solid steel.
The possibilities are endless. Every ance expert for example, knows ow difficult it 1s sometimes to explain a "misfire" in a gun, and what a dangerous opera. tion is the unfussing of the shell and taking ta pieces of the fuse to find what has gone wrong. With an X-ray apparatus it is perfectly simple to look through the fuse while -it still remains in the she!] and see exactly what the position _the striker is.
In the same way a new type of fuse invented by the Germans could be examined, and if desired photographed, so the com plete design was revealed; whicl made the operation of dismantling the fuse much more simple and less hazardous.
In fact X-ray photography can produce what is practically a sec: tional drawing of any piece of mechanism, which should have enormous potentialities for educa tional purposes. These radiographical sets can be made portable and one looks forward to the day when' no experimental or training workshop will be without one. How enormously simplified would
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