Electrode-holder for emission spectrograph

Claim 1

An electrode holder for an emission spectrograph, comprising a cylindrical excitation chamber having parallel top and bottom end walls a sliding column passing through at least one of the top and bottom end walls of the chamber, an electrode-holding clamp supported by said column within the interior of the chamber, a system for controlling the opening and closure of the clamp and the displacement of the column in three directions at right angles to each other mounted externally on said chamber, said clamp-carrying column comprising two coaxial tubes, one tube being stationary and the other being rotatable each of said tubes having an endpiece, a half clamp mounted on each of said endpieces, said system including a carriage block and two superposed and movable carriages supporting said column and rigidly fixed for translational motion in a first direction parallel to the end walls of said chamber, means for coupling said carriages for controlling the displacement of the upper carriage alone in a second direction at right angles to the first direction and parallel to the end wall of said chamber supporting said carriages, a nut rigidly fixed to said block mounted for translational motion in a direction perpendicular to said end walls only along a worm-screw, and means for rotating said wormscrew said worm-screw being carried by said upper carriage.