Next moment the wig came off, and there was disclosed to the Doctor's gaze a bald cranium.
Then the Clockwork man turned himself slowly round.
The Doctor shot out a hand and gripped the framework of the shelves. As his eyes rested upon the object that now confronted him, he swung slowly round until his body was partly supported by the shelves. His mouth opened wide and remained stretched to its limit.
At first, what he saw looked like another face, only it was round and polished. A second glance made it quite plain that instead of a back to the Clockwork man's head, there was a sort of glass dial, beneath which the doctor dimly made out myriads of indicators, tiny hands that moved round a circle marked with inconceivably minute divisions. Some of the hands moved slowly, some only just visibly, whilst others spun round with such speed that they left only a blurred impression of a vibratant rotary movement. Besides the hands there were stops, queer-shaped knobs and diminutive buttons, each one marked with a small, neat number. Little metal flaps fluttered quickly and irregularly, like the indicators on a telephone switchboard. There was a faint throbbing and commotion, a suggestion of power at high pressure.
Just for a moment the Doctor tried to realise that he was looking upon the supreme marvel of human ingenuity. He made an effort to stretch his brain once more in order to grasp the significance of this paragon of eight thousand years hence. But he did not succeed. The strain of the past hour reached its first climax. He began to tremble violently. His elbow went back with a sharp jerk and smashed three bottles standing on the shelf behind him. He made little whimpering noises in his throat.
"Oh, God," he whispered, hoarsely, and then again, as though to comfort himself, "Oh, God."
"If you open the lid," explained the Clockwork man (and at the sound of that human voice the doctor jumped violently), "you will see certain stops, marked with numbers."
Obedient, in spite of himself, the Doctor discovered a minute hinge and swung open the glass lid. The palpitating clock, with its stir of noises slightly accentuated, lay exposed to his touch.
"Stop XI," continued the Clockwork man, in tones of sharp instruction. "Press hard. Then wind Y 4 three times."