Mechanics' and engineers' pocket-book of tables, rules, and formulas pertaining to mechanics, mathematics, and physics

by Charles Haynes Haswell

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. 1920 ...times its weight of water. Lime (quicklime) must be slaked before it can be used as a matrix fur mortar. Ordinary method of slaking is by submitting the lime to its full proportion of water (previously known or attained by trial) in order to reduce it to the consistency of a thick pulp. The volume of water required for this purpose will vary with different limes, and will range from 2.5 to 3 volumes that of the lime, and it is imperative that it should all be poured upon it so nearly at one time as to be in advance of the elevation of the temperature consequent upon its reduction. This process, when the water used is in an excessive quantity, is termed "drowning," and when the volume of lime has increased by the absorption of water it is termed its " growth." If too much water is used, the binding qualities of the lime is injured by its semi-fluidity; and if too little, it is injurious to add after the reduction of the lime has commenced, as it reduces its temj)erature and renders it granular and lumpy. While lime is in progress of slaking it should be covered with a tarpaulin or canvas (a layer of sand will suffice), in order to concentrate its evolved heat. The essential point in slaking is to attain the complete reduction of the lime, and the greater the hydraulic energy of a lime, the more difficult it becomes to effect it. Whitewash or Grouting.--When lime is required for a whitewash or for grouting, it should be thoroughly " drowned," and then run off into tight vessels and closed. Slaking by Immersion is the method of suspending lime in a suitable vessel in water for a very brief period, and withdrawing it before reduction commences. The lime is then transferred to casks or like suitable receptacles, and tightly enclosed...

366 pages, Paperback

Published January 1, 2012