ten o'clock
`` What is that ? '' I asked . `` It does for vision what the telephone does for hearing , '' replied the doctor , and , leading the way to the music room , he showed me the apparatus . `` It is ten o'clock , '' he said , `` and we have no time for explanations now . Take this chair and adjust the instrument as you see me do . Now ! '' Instantly , without warning , or the faintest preparation for what was coming , I found myself looking into the interior of a large room .