On the drive home from the train park n' ride tonight, I remarked to Mrs. Left that I was on pins and needles for NASA's first use of Curiosity's impact drill to obtain a test sample from the inside of a worthy rock. "It's the only instrument on the mission that they haven't tested yet." I remarked. ARRRRRRRRRRRRRRNNNN! Sorry, that's wrong, but thanks for playing.
Follow me out into the tall grass and I'll tell you all about it.
NASA calls it the DRT, the Dirt Removal Tool. It looks to me like it works pretty well. Here is how NASA describes it:
The tool is a motorized, wire-bristle brush on the turret at the end of the rover's arm. Its first use was on the 150th Martian day, or sol, of the mission (Jan. 6, 2013). MAHLI took this image from a distance of about 10 inches (25 centimeters) after the brushing was completed on this rock target called "Ekwir_1." The patch of the rock from which dust has been brushed away is about 1.85 inches by 2.44 inches (47 millimeters by 62 millimeters). The scale bar at bottom right is 1 centimeter (0.39 inch).You can see it on the right side of the turret in this image, apparently in its stowed position:
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