By F G Dimes, J. Ashurst
One of many difficulties which beset the sensible conservation of stone constructions is the fragmentation of the disciplines concerned. This publication, with either volumes now on hand as one precious paperback, brings those disciplines jointly through the involvement of individuals with varied stories and methods to an identical fabric. half one is an creation to the complexities and heritage historical past of stone conservation by way of the main complete description but produced of the construction and ornamental stones utilized in the British Isles.In half , practitioners taken with stone conservation describe ways that significant structural masonry difficulties, secondary development difficulties and assorted stone floor stipulations might be taken care of. quite a few development kinds and environments has been used to make sure that the extensive scope of universal difficulties is roofed. This moment a part of the e-book can be of functional price to paintings historians, archaeologists, architects, surveyors and engineers, masonry contractors and sculpture conservators in fixing difficulties and in studying to exploit each one other's abilities and adventure. hugely illustratedTwo informative volumes introduced jointly in a brand new paperback editionExcellent authorial mixture
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Additional info for Conservation of Building and Decorative Stone (Butterworth-Heinemann Series in Conservation and Museology)
Colour depends on the reflection of some of the vibrations of white light seen by the human eye. It is one of the most difficult characteristics to describe. Nevertheless, it may well be the deciding factor in the choice of a stone, particularly for decorative purposes. The description of a stone as 'light salmon-coloured, coarsely crystalline, having a slightly mottled appearance' conveys little. ^ Any given hue (colour) is expressed in terms of value (property of lightness) and chroma (degree The object of giving a name to any substance whether animal, vegetable or mineral is that when that name is used it is immediately and universally recognized as relating to a defined material with identifiable characteristics which distinrmish it from all other materials.
The mineral matter of the rocks may be re-formed to produce larger crystals of the original mineral or it may be recrystallized to form new minerals that are stable in the new environment. It is important to note that the rocks remain essentially solid during these processes and may retain some of their original characteristics. There are two categories of metamorphism which are of interest. The first type is that caused by heat alone from, for instance, an igneous intrusion. This is termed contact metamorphism.
If a clay is subjected to sustained regional pressure at low temperature, the flaky materials present tend to reorientate at right angles to the direction of strong stress. Some recrystallization also occurs and small flakes of new minerals, mostly mica, and chlorite, a hydrated silicate of aluminium, iron and magnesium, ((Mg,Fe,Al)6(Si,Al)4010(OH)8), grow at right angles to the direction of principal stress. A new rock, termed a slate, is formed and it has a parallel orientation of planar minerals impressed upon it.