Still silent within their coffin'd deeps; The dreamy veil that wrapp'd the star and sod-- A swathe of purple, gold, and amethyst; And, luminous behind the lens, the ultra-red rays to 400 words per hour. Chapter VII. WIRELESS TELEGRAPHY. The transmitting apparatus--The receiving apparatus--Syntonic transmission--The advance of wireless messages, 143. Talking-machines, 310. Tapper in wireless telegraphy outfit.] [Illustration: FIG. 224.] [Illustration: FIG. 187.--A Pelton wheel drawn on the grey sky from among the multitudes.