"Any spurious attempts to enter by side doors, fire escapes or ventilating shafts will be met by force," announced a cardboard lobby cut-out of Hitchcock, pointing sternly at his watch.
The Holland was the first tunnel in the world designed for motor traffic, and it presented a number of challenges for its engineer, Clifford Milburn Holland, who, Frazier writes, "devised a system using ventilating shafts, giant blowers, and ducts below the roadway and in the ceiling for outgoing and incoming air".
A novel ventilated shaft brake disc prepared by SiC3D/Al alloy co-continuous composites (SiC3D/Al, 3D means three-dimensional network structure) was presented in this study, which can effectively reduce the unspring weight of high-speed trains.
"I found a ventilation shaft.
It seeps out of coal seams and can build up easily in poorly ventilated mine shafts.
Its mine accidents are often caused by methane, a naturally occurring, colorless, odorless and highly explosive gas that seeps out of coal seams and can build up in poorly ventilated mine shafts.
The accidents are often caused by explosions of methane, a colorless and odorless gas that seeps out of coal seams and can build up in poorly ventilated mine shafts.
In poured clouds of dust, penetrating the structure through ventilating ducts, elevator shafts, stairwells and wall cavities.
-- All buildings or rooms occupied as biscuit, bread, pie or cake bakeries shall be drained and plumbed in a manner conducive to the proper and healthful sanitary condition thereof, and shall be constructed with air shafts, windows or ventilating pipes, sufficient to insure ventilation.
