Labels:bottle | clock | door | fan | french horn | shelf | sky OCR: VALVE LEVERS HERE ARE THREE MAIN LEVERS which you control with the mi ddle fingers of your left hand These levers oper 'ate three valves. When a lever pressed it moves rods which cause the rotary valve to turn. This allows air into an extra length of tubing and changes the pitch of the note The French horn also has a fourth valve the thumb valve which is used to cut out a third of the tubing to change the pitch of the horn from B flat. This helps to play the hi gher notes hanges thumh
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