The glass began to revolve slowly round and round the board.
“It is examining the letters,” said somebody.
“Yes,” came the answer from the board. “Ask something.”
“Good enough,” said Matthews. “Now write in code. Tell us who you are in code.”
There was a long pause.
“The glass feels quite dead, as if there’s nothing here,” said the Doc. at last.
“I expect it has gone next door to examine the code,” said somebody, with a laugh that sounded a trifle forced.
“B-M-X,” the glass wrote.
“Is that who you are?”
“B-M-X,” said the glass again.