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Dry FGD systems, on the other hand, use a solid sorbent, like limestone or lime, to react with the SO2. The resulting compound is then removed from the gas stream through a filtration process. Although less efficient than wet FGD, it is more suitable for smaller installations due to its lower capital cost Although less efficient than wet FGD, it is more suitable for smaller installations due to its lower capital cost Although less efficient than wet FGD, it is more suitable for smaller installations due to its lower capital cost Although less efficient than wet FGD, it is more suitable for smaller installations due to its lower capital costflue gas desulfurization.

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It was not until the development of the hydraulic drifter in the 1950s that rock drilling truly entered the modern eradrifter for rock drill. This innovative tool used high-pressure hydraulic fluid to power a piston that rotated the drill bit, allowing for much greater penetration rates and precision. The hydraulic drifter quickly became the go-to tool for drilling holes in hard rock, paving the way for many of the major engineering projects of the time.

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