Twentieth century hand-book for steam engineers and electricians with questions and answers; a practical non-technical treatise .. (1913)
Swingle, Calvin Franklin, 1846- [from old catalog] · Chicago, F. J. Drake & company · leaf 987
causes it to leave the water, and thusa vacuum is formed underneath it. This vacuum together with the tank pressure on top ofthe piston soon arrests the movement of the car, but thestop is not so sudden. One objection to having the con-Jiection from cylinder to pressure tank through the inletoipe I… … Fig. 395 Hydraulic Elevators 959 run out with such freedom that if the car should happento be at^ or near the top of the hatchway it would attain adangerous speed by the time it reached the bottom. Butby locating the pressure tank on the roof of the buildingthe danger from this source is obviated^…
![An illustration from [Electric engineering.] (1902)](https://img.insideoutlibrary.com/img/200/ia-electricengineer04inte-81-22.webp)
