Elevation finder for infrared device

Claim 1

IN COMBINATION WITH AN INFRARED SEARCH DEVICE INCLUDING A DIAGONAL MIRROR FOR RECEIVING TARGET ENERGY FROM A PREDETERMINED ELEVATIONAL SECTOR, AN INFRARED DETECTOR CELL POSITIONED SUBJACENT SAID MIRROR FOR RECEIVING REFLECTED TARGET ENERGY THEREFROM, AND A RETICLE LOCATED BETWEEN SAID MIRROR AND SAID CELL, SAID REFLECTED ENERGY STRIKING SAID CELL AFTER PASSING THROUGH A RETICLE AT POINTS DETERMINED BY THE ELEVATION OF SAID TARGET ENERGY WITHIN SAID PREDETERMINED SECTOR, SAID CELL EMITTING A SIGNAL WHEN TARGET ENERGY STRICKES ANY POINTS THEREON, AN ELEVATION FINDER COMPRICING: (A) A WAND POSITIONABLE WITH RESPECT TO SAID RETICLE TO BLOCK SAID ENERGY FROM SAID CELL; (B) MEANS FOR POSITIONING SAID WAND AT A LOCATION WITH RESPECT TO SAID RETICLE AT WHICH SAID WAND BLOCKS THE ENERGY DIRECTED TO SAID CELL FROM SAID TARGET; AND (C) MEANS FOR INDICATING THE POSITION OF SAID WAND TO PROVIDE AN INDICATION OF THE ELEVATION OF SAID TARGET.