Kathleen Schlesinger, 1911 Encyclopædia Britannica, Volume 12… (1911)
“ The lyre-shaped glockenspiel, or steel harmonica (Stahlharmonika) , is a newer model, which has instead of bells twelve or more bars of steel, graduating in size according to their pitch. These bars are fastened horizontally across two bars of steel set perpendicularly in a steel frame in the shape of a lyre. The bars are struck by little steel hammers attached to whalebone sticks. ”
