Double crystal analyzer linkage

A double crystal analyzer linkage, comprising:

• a fixed pivot point;
• first, second and third sliding axis pivot points constrained to move along spaced apart, parallel first, second and third linear pathways, said fixed pivot point being located on said third pathway between said first and second pathways, distances between said first and third pathways and said second and third pathways being equal;
• said first and second movable axis pivot points having, respectively, first and second means to secure first and second diffracting crystals so that centroids of said first and second diffracting crystals are located at respective ones of said first and second movable axis pivot points;
• a right angle slide which is movable along said third pathway, said right angle slide having first and second pathways passing therethrough at right angles to but spaced apart from one another and passing through said third movable axis pivot points;
• first and second linkages sliding in said first and second pathways of said right angle slide and connected respectively to said first and second means to secure said first and second diffracting crystals so as to constrain planar surfaces of said diffracting crystals to remain parallel to one another as said first and second movable axis pivot points move along said first and second spaced apart, parallel linear pathways;
• an in-line slide connected to and pivoting about said fixed pivot point, said in-line slide having third and fourth pathways passing therethrough parallel to but spaced apart from one another;
• and
• third and fourth linkages sliding in said third and fourth pathways, respectively, and connected respectively to said first and second means to secure said first and second diffracting crystals so as to constrain said diffracting crystals to be equidistant from said fixed pivot point as said first and second movable axis pivot points move along said spaced apart, parallel linear pathways.