This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1895 Excerpt: ...is then brought forward by the gantry and is adjusted in position. Other rings with air-tight joints are then bolted on to it until a column is built passing up through the " pig-sty" framing and above the staging to the greatest convenient height. The column is then carefully plumbed and secured in a vertical position by the framing and wedges. The tubing and concrete kentledge subsequently described is inserted as the building proceeds, and is completed so far as is necessary; after which, if possible, it is left for a short time to give the concrete time to set. When the column is ready for use, the air-lock is placed on the top of it and bolted with an air-tight joint to the upper flange of the topmost cylindrical ring, when the air-connections are made and sinking under...