the hour of four o'clock in the morning
The very ground commenced to vibrate around them and the massive structure seemed to be alive with straining power . Then Steinholt , going to a corner of the intricate board , adjusted a few levers , while his gnomelike companion watched him carefully . `` And now , Gaeble , '' the scientist said impressively , `` these are your orders . At precisely the hour of four o'clock in the morning make one connection with this switch . '' * * * * * He indicated , with a stubby finger , the lever to be operated . `` Keep the circuit closed for just four seconds , '' he added slowly , `` and then break it . Do you understand , Gaeble ? ''