all you need to know to pass it. Three months after you become a third-class man, you could take another examination, and if you passed that, you’d become a second-class petty officer. This second examination would deal with wireless theory and codes and the semaphore and blinkers.” And noting Henry’s blank expression, the young wireless man continued, “You noticed the semaphores on the yardarm on the forward mast, didn’t you? And the lights there?”
“Sure,” said Henry.
“Well, we no longer use flags when we semaphore. We use the semaphores up on the yardarms. At night we use those lights or blinkers and make ’em wink by electricity. It’s really sending wireless messages with lights instead of sound waves.”
“And how does a fellow become a first-class radio man?”
“To become a first-class man, you’d have to have a good knowledge of all parts of the ship, and all radio laws and regulations and general radio procedure. You could take your examination nine months after you entered the service, but there are mighty few radio men who are ready to take it so soon.”
“What about Mr. Sharp here? He is chief electrician. How long does it take to become a chief electrician? ”
