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(mining engineering)
Distance between the drill platform and the bottom of the sheave wheel.
Height between the floor and the roof in a mine opening.


The clear vertical distance between a floor or stair tread and the ceiling or overhead obstruction.

headroom, headway

1. The clear vertical space (as from floor to ceiling), esp. the height which is available for passage.
2. In the stage-house of a theater, the clear height over the gridiron.
References in periodicals archive ?
Another potential source of headroom would be suspending payments to and redeeming government securities held by the Civil Service Retirement and Disability Fund.
If the willingness to pay (WTP) is 30,000 [pounds sterling], it follows that the headroom can be expressed as
The new roof angles up from the joists: facing the street, the hip roof keeps the house from seeming too tall, but behind it dormers provide added headroom.
Headroom to the new financial covenants has been set at a level which provides financial and operational flexibility, Eniro said.
The Split Frame Unloader allows discharging of bulk bags and rigid totes from mezzanines and other low headroom areas.
The unique electrical characteristics of Elpida's package include enough headroom to support higher frequencies for modules based on future generation DDR2 devices.
The company's engineering department has now developed an Overload Limit Switch that can be neatly installed in their Ultra Low Headroom series hoists, with no loss of "headroom.
DPV-B conveyors feature vacuum loading with bottom discharge and fit where low headroom makes other types of conveyors impractical.
By selecting RADEON XPRESS 200, we provide our customers with best-of-breed platform technology that easily meets their computing needs today, and ensures they have the headroom to handle the next-generation.
This three-axis design makes for a compact unit with minimal headroom requirement.