156 



THE APPLICATIONS OF PHYSICAL FORCES. [BOOK n. 



Then the strings are wound round pegs which enable the proper 

 tension to be given them and the instrument to be tuned. In 

 the lower part of the case, or at the foot of the harp, run out rods 

 fixed in the third side of the triangle. Each rod is connected in the 



FIG. 109. Mechanism of the harp. Key-board and pedals. 



AB. Section of keyboard, levers of the pedals, bolts and springs - 2. Pedals. 3. Mechanism of ;i 

 pedal p ; rod 4. a, arbor turning under the action of the pedal, causing the boot b of the hook to 

 move, and resting the string on the nut c.b. A spring serving to draw back the rods to their 

 positions when the action of the pedal ceases. 



foot, with a pedal which the performer presses when necessary to 

 sharpen or flatten any particular note, as will be subsequently 

 explained. 



on the side, bound to the finger and rounded on the other and these projecting 

 an inch beyond the finger-tips she uses to pluck the strings, thirteen in number, 

 made of silk or similar fibrous material. She arranges the bridges in a manner 

 suitable to the music of her country and the relation of its tones. H. S. 



