#54688, "RE: Vertical sliding Watertight Door system" In response to In response to 13
By approximately 1898 - 1900, when I can first account for H&W employing the solenoid-activated release, this was all considered pretty high-tech, whiz-bang, stuff. The first use of the H&W's vertical sliding doors, complete with the float and hydraulic descent regulation, was aboard the Teutonic and Majestic of 1889-1890. As with all of the versions of these doors that followed, they could be operated from the bridge -- BUT -- the release mechanism was a mechanical trip lever operated by a system of wire rope cables and pulleys, much like the methods employed in rigging the engine order, docking and steering telegraphs! Now, how's that for high-tech!