- A plane or parting in rock, normally involving no visible displacement. Joints often occur in parallel sets, cutting the rock into blocks.
- A discontinuity in any of the layers forming a road occurring either between the units or incidentally to the process of construction.
A period of the Mesozoic era between 213 and 144 million years ago, and the corresponding system of rocks.
Bearings which support rotating shafts loaded in such a way that the load is applied in a direction at right-angles to the axis of the shaft.
A drill carriage usually holding several drifters for tunnelling work.
The part of a shaft which is supported and held by a bearing.
The work performed when the point of application of a force of one newton is displaced through a distance of one metre in the direction of the force.
Symbol: J (=1Nm)
A beam which supports a floor or ceiling.
Insulating thimbles placed over the connected ends of detonator leads coupled in large rounds of shots, and over the connections between the detonator leads and the shotfiring cable.
The techniques of helping to determine a fair day’s pay for a particular job. It is the assessment of the value of the job not the individual and must reflect fairly the skill, experience, responsibility and condition of the job.
A rail bender operated by hand.