The Barker lever is a pneumatic system which multiplies the force of a finger on the key of a tracker pipe organ.
Travis Barker | Lever Brothers | Ronnie Barker | Lex Barker | Elinor Barker | Bob Barker | Mount Barker | Howard Barker | Sue Barker | Sir Orlando Bridgeman, 1st Baronet, of Great Lever | Mount Barker, South Australia | Clive Barker | William Lever, 1st Viscount Leverhulme | Ma Barker | Johnny Lever | Alfred Barker | William Lever | William George Barker | M. A. R. Barker | Great Lever | Eugene C. Barker | Benjamin Barker Odell, Jr. | Wendy Barker | Stephen Barker Guion | Sophie Barker | Robert Barker | Nick Barker | Nicholas Barker | Linda Barker | Lever |