In addition to the appliances mentioned the tools comprise reamers to enlarge the bore of the well, the winged-substitute which is fitted above the bit to prevent it from glancing off, and above the round reamer to keep it in place, a temper-screw with clamps and wrenches.
When its whole length is run down, the rope clamps play very near the well-mouth.
K clamps the telescope in declination, n clamps it in right ascension, and the handles m and I provide slow motion in declination and right ascension respectively.
18 clamps and 19 gives slow motion in declination; 20 clamps and 21 gives slow motion in right ascension.
Cast steel clamps hold the cable together, and to these the suspending rods are attached.