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Example text

Although it would be easy to assume that industrial SOz was responsible, the fact that many windows were removed from cathedrals and other public buildings during World War 2, as a precaution against bomb blast, and stored in poor conditions for some years, may have contributed to the rapid decay in recent decades. CONSERVATION OF GLASS The inherent fragility of glass, and its tendency to slowly undergo subtle changes in behaviour, have created considerable problems for its long-term protection.

In efforts to preserve stained-glass windows, a variety of protective films has been tried over the years, including varnishes based on natural products and modem synthetic polymers such as epoxy resins and polyesters. While some have looked promising in the short term, they are frequently found to be permeable to water vapour and so 38 permit the entry of water, with its attendant problems. What is needed is an accelerated ageing test to predict the result of a given treatment in, say, a hundred years' time.

It can be made to transmit light. The metals known in antiquity are few in number - apart from gold and silver, there were copper, lead, tin and iron. They have been alloyed with each other in various combinations, both by accident and intentionally, from earliest times. 1. Henry Schliemann, the archaeologist who uncovered the ruins of Mycenae, discovered a vessel full of mercury in a grave at Kuma, dated to the sixteenth century Be. However, the metal is very scarce as a mineral and even more so as the free metal, although it was eagerly sought by mediaeval alchemists in their search for the transmutation of base metals into gold.

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