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theodolite ![click to hear : theodolite click to hear : theodolite](../../../images/speaker-vert.gif)
Sighting instrument that is used especially in astronomy, geodesy and navigation for measuring horizontal and vertical angles.
alidade level ![click to hear : alidade level click to hear : alidade level](../../../images/speaker-vert.gif)
Transparent tube that contains liquid and an air bubble; it serves as a guide for positioning the alidade on the vertical axis.
illumination mirror ![click to hear : illumination mirror click to hear : illumination mirror](../../../images/speaker-vert.gif)
Adjustable polished glass surface that reflects light onto the circles so that the angles can be read.
leveling head ![click to hear : leveling head click to hear : leveling head](../../../images/speaker-vert.gif)
Platform serving as a support for the theolodite.
horizontal clamp ![click to hear : horizontal clamp click to hear : horizontal clamp](../../../images/speaker-vert.gif)
Knob that locks the alidade to prevent it from rotating.
leveling head locking knob ![click to hear : leveling head locking knob click to hear : leveling head locking knob](../../../images/speaker-vert.gif)
Knob that locks the alidade to the leveling head.
leveling head level ![click to hear : leveling head level click to hear : leveling head level](../../../images/speaker-vert.gif)
Transparent tube that contains liquid and an air bubble; it serves as a guide for positioning the leveling head on the horizontal axis.
base plate ![click to hear : base plate click to hear : base plate](../../../images/speaker-vert.gif)
Plate to which the leveling head is attached by means of three leveling screws.
leveling screw ![click to hear : leveling screw click to hear : leveling screw](../../../images/speaker-vert.gif)
Screw that adjusts the theodolite’s leveling head level on the horizontal plane.
telescope ![click to hear : telescope click to hear : telescope](../../../images/speaker-vert.gif)
Optical instrument composed of several lenses; it can be adjusted in the horizontal and vertical planes and is used to observe distant objects.
optical sight ![click to hear : optical sight click to hear : optical sight](../../../images/speaker-vert.gif)
Device with an eyepiece that precisely aims the telescope at the target whose angles are to be measured.
adjustment for horizontal-circle image ![click to hear : adjustment for horizontal-circle image click to hear : adjustment for horizontal-circle image](../../../images/speaker-vert.gif)
Knob that adjusts the sharpness of the image of the horizontal circle (graduated from 0° to 360°) in order to read the angles on the horizontal axis.
micrometer screw ![click to hear : micrometer screw click to hear : micrometer screw](../../../images/speaker-vert.gif)
Knob that adjusts the micrometer to give a very precise reading of the circles’ measurements.
adjustment for vertical-circle image ![click to hear : adjustment for vertical-circle image click to hear : adjustment for vertical-circle image](../../../images/speaker-vert.gif)
Knob that adjusts the sharpness of the image of the vertical circle (graduated from 0° to 360°) in order to read the angles on the vertical axis.
alidade ![click to hear : alidade click to hear : alidade](../../../images/speaker-vert.gif)
Part of the theodolite that rotates on a vertical axle to measure angles by means of the telescope.