B-52 E&F Stratofortess Bomber Flight Manual TO 1B-52E-1 F-105 Thunderchief The mach number limit is

The mach number limit is adjusted for the specific aircraft model by removing the blue hex screw cap on the rear case to reveal the limit screw

The compass would have been mounted on a table or a pedestal

This is a lot of 6 vintage ammeters

the aircraft is at its maximum allowable airspeed or maximum allowable mach speed

According to the US Army Air Force Interchangeability Cross Reference Chart dated February 1945

B-52 E&F Stratofortess Bomber Flight Manual TO 1B-52E-1 F-105 Thunderchief The mach number limit isHere is an authentic Flight Manual for the Boeing Stratofortress B 52 E & F models, dated February 1967 with updates as of April 1974. The manual appears to be complete with ~1,000 pages of text, diagrams, tables, and illustrations, black and white and color. It is ~ 3 inches thick in a metal covered 3 binder and the contents are in very good condition given its age.