Apparatus for transmitting a laser beam

An apparatus for transmitting a beam of energy said apparatus comprising:

• a first arm comprising a hollow tube having a longitudinal axis, said arm being disposed for rotation about said axis;
• first reflecting means disposed within said tube so as to reflect said beam along said longitudinal axis;
• a second arm comprising a first half arm and a second half arm having the same weight, said half arms being symmetrical of each other with respect to a plane containing the longitudinal axis of said first arm and at least said first half arm being hollow;
• at least one intermediate part connecting said second arm to said first arm so that said second arm may rotate with respect to said first arm about an axis perpendicular to the longitudinal axis of the first arm and encountering the latter;
• second reflecting means for transmitting the beam reflected by said first reflecting means within said first half arm;
• a third arm comprising a hollow tube having a longitudinal axis;
• at least one intermediate member connecting said third arm to said second arm so that said third arm may rotate with respect to said second arm about an axis perpendicular to the longitudinal axis of said third arm;
• and
• third reflecting means for deviating the beam circulating within said first half arm so that it coincides with the longitudinal axis of said third arm.