A vapor deposition method and apparatus including at least two vessels containing a same first source chemical. The apparatus includes upper and lower optical systems that allow for simultaneous imaging of frontside and backside alignment marks. Each of the pontoons are secured to the hull by forward and aft link boxes. The securement member captures the first member within the second member and permits relative movement between the first and second members in a direction along a longitudinal axis of the first and second members, and restricts motion between the first and second members in a direction transverse to the longitudinal axis. The rib-like element intersects the sternum-like element and includes a bone and a skin covering the bone. At least the three seating surfaces and the seating surface bonded part are symmetrically arranged on the optical surface of the prism.