The Boy Spy
Telegraphers have many methods of secret communication with each other: rattling teaspoons or tapping knives and forks at the table, or the apparently aimless "Devil's tattoo" of the fingers on the table or armchair are common methods, and I have heard of one in a tight corner who winked out a message appealing for help. It might be well to avoid playing poker at a table where two telegraphers are chums, for it is possible that one might learn when to stay in a little longer for the raise and make a pot a little bigger.
When Colonel Thos. A. Scott became Assistant Secretary of War