Joint for an observation device

A joint for an observation device comprising

• a device mount,
• at least two joint members,
• an observation device,
• a first and a second pivot
• said first pivot having a non-displaceable axis of rotation substantially at right angles relative to the object plane,
• said second pivot having a first displaceable axis of rotation,
• said first pivot seating for rotation one of the two joint members via one end portion of the latter relative to said observation device,
• said second pivot seating for rotation via one end portion the other of the two joint members to the other end portion of said one joint member,
• said non-displaceable axis of rotation and said first axis of rotation intersecting in a common point of intersection in the observation plane,
• means for directing an observation beam within the members mentioned hereinbefore,
• said observation beam emitting from out of the observation device partially coinciding with said non-displaceable axis of rotation,
• the portion of said observation beam between the means for directing said observation beam in said first joint member and the respective means in said second joint member coinciding with said first axis of rotation,
• the portion of said observation beam directed by said directing means in said second joint member intersecting in said common point of intersection,
• the latter beam portion and said first displaceable axis of rotation,
• said first displaceable axis of rotation and said non-displaceable axis of the rotation, respectively, include a constant angle.