| http://www.w3.org/ns/prov#value | - ttachable to the first source and intersecting of said path, said fixture including means incrementally movable and positionable along two axes orthogonal to each other and generally orthogonal to said path, at least a portion of said fixture intersected by said path being radiolucent to the radiation from said first source, a radiolucent mirror mounted in the radiolucent portion of said fixture a
|
