Рет қаралды 5,763
The piano frame is the heaviest part of the piano, weighing in at around 450 pounds for a grand piano, providing the main tensile strength for modern instruments. Cast iron frames have been used in piano designs since the 1870’s. Prior to cast iron frames, pianos frames were made entirely of wood. But as composers wrote pieces that demanded more notes and a wider dynamic range, the wooden frames had a tendency to buckle and warp under the tremendous stresses from the stretched strings. Modern piano strings can exert 18-20 tons of pressure! To learn more, visit our website at www.cunninghamp...