Endcap Calorimeter Prototype 
This is a close-up view of the bottom of the endcap electromagnetic calorimeter prototype detector box. Visible in the picture are the stands that tilt the detector box by approximately 10 degrees downstream of a vertical plane. The tilt is to partially compensate for the projective geometry of the calorimeter towers, so that the showers produced by the incident electrons are more fully contained within a single tower. Visible at the bottom of the detector box are the six optical connectors, carrying scintillation light from the 60 vertical triangular strip detectors comprising the shower-maximum detector "x-plane". Also visible in the picture are the rails and bearings forming part of the remotely controlled translation of the 1200 pound prototype detector in the horizontal direction.   
Slide 9 of 9