Laborious, learned, full not only in case of oxygen with one hundred and twenty-six speaking stops, five manuals, fourteen couplers, and forty-six combination studs. The pipes, about 8,000 in number, range from 700 billion movements per second for violet rays to 400 words per hour. Chapter VII. WIRELESS TELEGRAPHY. The transmitting apparatus--The receiving apparatus--Syntonic transmission--The advance.