head-telephone

Updated: July 20, 2025

So that though the clicks may sound very loud at the sending apparatus, and the blue sparks be very bright, still only faint clicks can be heard in the head-telephone receiver at the other end. "You may send," directed Captain Grantly to Captain Wakefield, and the blue sparks shot out in a dazzling succession, as the spiked wheel spun around.

Howard Roger Garis - Dick Hamilton's Airship, or, a Young Millionaire in the Clouds