8 to the Bar credited to (Johnson - Ammons) 8 to the Bar 8 to the Bar is a studio album released by Pete Johnson and Albert Ammons in 1941 on Victor 78rpm set P-69, record numbers 27504 through 27507. It was recorded in two sessions, May 7 and June 17, 1941. It was reissued by RCA Victor in 1952 as a 10-inch LP record as LPT-9. In the United Kingdom, this LP was released by the Gramophone Company as HMV DLP 1011. It was also released as a set of four 45rpm discs, WPT-14. The album peaked at number 2, in 1945, on
Beam diameter Beam diameter The beam diameter or beam width of an electromagnetic beam is the diameter along any specified line that is perpendicular to the beam axis and intersects it. Since beams typically do not have sharp edges, the diameter can be defined in many different ways. Five definitions of the beam width are in common use: D4σ, 10/90 or 20/80 knife-edge, 1/e, FWHM, and D86. The beam width can be measured in units of length at a particular plane perpendicular to the beam axis, but it can also refer to the angular width, which is the angle subtended by the