Before him was a circular shaft
. He held the candle above it and peered downward.
Unusually even the walls of the main circular shaft
are almost honeycombed with small rooms and chambers linked by tiny passages and stairways.
For a classical circular shaft
the dimension (radius) of the shaft target would be also further determined in several steps.
Work in the shaft involved stripping old timbers out of a smaller rectangular shaft and widening it to a circular shaft
Giulio Magli, a historian of ancient architecture from Milan Polytechnic, Italy, and Robert Hannah, a classics scholar from the University of Otago in New Zealand, have discovered that at precisely midday during the March equinox, a circular shaft
of light shines through the oculus and illuminates the Pantheon's imposing entrance, reports the Telegraph.
The central core of the eight bedroom house is now .ooded in natural light through a circular shaft
- enhancing the panelled doors that open on to the main reception rooms.
Containing a set of lifts that connect three levels of expensive-looking boutiques, the circular shaft
is also entwined by cleanly detailed spiral stairs.
A major capital project in the El Indio/Viento mine is the sinking of a sub-vertical circular shaft
, 4.9 m in diameter, the planned depth below shaft collar being 545 m.
The 5 m diameter circular shaft
is about 1,000 m deep and is equipped with two 5 t capacity skips, driven by an ASEA-Siemens Koepe hoist using 48 mm diameter ropes.
Akinturk, "Modeling and calibration for crack detection in circular shafts
supported on bearings using lateral and torsional vibration measurements," Advances in Mechanical Engineering, vol.
The Compact line consists of four models, the BM150D, BM150DT, BM400 and the BM500, which are perfect for inner-city work as they require smaller jacking pits and can also be used in circular shafts
and larger pipes for dead end drilling applications.