Ladder rung spacing

When a common ladder serves two or more platforms, the ladder rungs must be level with the platforms they serve. The platform elevations must be in even increments to suit the standard 12-in (300-mm) ladder rung spacing. Exhibit 1047 illustrates dris re-... 

Scaffold frames — that are used as access ladders must (1) be specifically designed and constructed for use as ladder rungs, (2) be uniformly spaced within each frame section. 

A double-cleated ladder, or two or more ladders, must be provided when ladders are the only way to enter or exit a work area having twenty-five or more employees, or when a ladder serves simultaneous two-way traffic. Ladder rungs, cleats, and steps must be parallel, level, and uniformly spaced when the ladder is in position for use. Rungs, cleats, and steps of portable and fixed ladders (except as provided below) must not be spaced less than 10 inches apart, or more than 14 inches apart, along the ladder s side-rails. Rungs, cleats, and steps of step stools must not be less than 8 inches apart, nor more than 12 inches apart, between center lines of the rungs, cleats, and steps. 

Ladder rungs, cleats, and steps shall be parallel, level, and uniformly spaced when the ladder Is In position for use. 

Are the rungs of ladders uniformly spaced at 12 inches (30.48 centimeters) center to center ... 

Ladder rungs should be equally spaced throughout including the first rung below the landing. 

Rung spacing should be around 0.3 meter center to center and should be uniformly spaced throughout the length of the ladder. 

Where multiple runs of ladder lengths are required to cover the vertical distance, the same rung spacing should be used for all run lengths where possible. 

Figure 5.12 shows that, unlike rungs on a ladder, however, the hydrogen atom s energy levels are not evenly spaced. Figure 5.12 also illustrates the four electron transitions that account for visible lines in hydrogen s atomic emission spectrum, shown in Figure 5.8. Electron transitions from higher-energy orbits to the second orbit account for all of hydrogen s visible lines, which form the Balmer series. Other electron transitions have been measured that are not visible, such as the Lyman series (ultraviolet), in which electrons drop into the n = I orbit, and the Paschen series (infrared), in which electrons drop into the n = 3 orbit.

Cages must not extend less than 27 inches or more than 30 inches from the center-line of the step or rung, and must not be less than 27 inches wide. The inside of the cage must be clear of projections. Horizontal bands must be fastened to the side-rails of rail ladders or directly to the structure, building, or equipment for individual-rung ladders. Horizontal bands must be spaced at intervals not more than 4 feet apart, measured from centerline to centerline. Vertical bars must be on the inside of the... 

The fifth rung of Jacob s ladder adds exact correlation as new ingredient. One might think of this as an expansion of the density space of a system by adding virtual densities into the picture. One approach to this problem is the use of the random phase approximation (RPA). RPA in DFT in turn is closely related to time-dependent DFT (TD-DFT). The essence of RPA might be described as constructing the excited states of a system as a superposition of particle-hole excitations. 

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