An Account of the Harbour and Docks at Kingston-upon-Hull by John Timperley

Author:John Timperley [Timperley, John]
Language: eng
Format: epub
ISBN: 9781523219254
Google: mSYljwEACAAJ
Publisher: CreateSpace Independent Publishing Platform
Published: 2016-01-15T00:44:18+00:00

p.27

The timber in the foundations, which was all fir, was, with the exception of the sap, invariably as sound and good as when first put down ; the oak fenders, constantly under water, were also in a good state, but the upper part of many of them beginning to decay, and a few actually rotten ; as were the horizontal fir fenders, and the oak ties near the top of the wall. The wrought iron varied considerably : in some places the spikes in the foundations were quite fresh and good, in others a little corroded, and in others almost rusted away.

The mortar was generally very soft, but at the wide parts, and espe- cially the foundations of the old communication at Myton-gate, so much so, that it might have been beat up without a drop of water, and used again. In the parts near the top of the wall not so much exposed to damps, the mortar was tolerably hard ; but I saw none, except in the inverted arch of Myton-gate old communication, that would bear any comparison with that of the Old dock ; the mortar in that invert, which was made from ground lime, mixed with a proper proportion of sand, and then ground again in the mill, was, however, so hard, and adhered so firmly to the bricks, that it required a sledge and wedges to separate them. The mortar in the front of the wall had much the same appearance as that of the Old dock, being soft and very much out of the joints for nine or ten feet from the top; below this the joints were not wasted, but had thrown out a sort of stalactite or calcareous incrust- ation that entirely covered the face of the wall. Notwithstanding the soft state of the mortar.in these walls, I am of opinion, from their being in general so well flushed or grouted as to be impervious to water, that it will ultimately acquire considerable hardness, although perhaps not for many years. This I infer fi^m the state of the mortar in the Old dock and several other walls that I have had an opportunity of observing, built with nearly the same kind of lime.

The pozzuolana mortar, where always wet, or where wet and dry alter- nately, and also where constantly dry, was found in general exceedingly hard, being both in hardness and colour very much like a well burnt red brick. This mortar usually adheres very well to the bricks, but sometimes not so well to the stone, partly perhaps from the stone being set too dry, which is commonly the case in summer, and partly from a property peculiar to mortar made from magnesian stone, of expelling or throwing the lime to the outside, either in a dry state, like flour. or where the walls are wet or damp, like

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