Symbol	Definition	Section
$R_{r}$	required slenderness ratio
$L$	length of the test item, cm
$D$	diameter of the test item, cm
$N$	number of test items
$S_{W}$	space between test item and wall, cm
$S_{B}$	space between each test item, cm Compute the test item actual slenderness ratio, $R_a$, from