by telegraphers, or "telegraphers' paralysis" in medical literature. It was common and was caused by forcefully "pounding brass" up-and-down on conventional telegraph keys. Keys built for side-to-side motion would neither cause nor aggravate the injury, and allowed disabled telegraphers to continue in their profession.

Modern telegraphy

thumbWith the advent of solid state electronics, the convenience of fully automatic keying became

1.Previous
3.Next