Читать книгу Monument Future - Siegfried Siegesmund - Страница 22

This report has shown that the concept of the Risk Number accurately represents the degree of endangerment to outdoor sculptures. The difference often found between a visually subjective evaluation and the objectively calculated Risk Number initially led to the conclusion that the Risk Number would not accurately reflect the overall situation. The fact, however, that the Risk Numbers describe the conditions of environment and stone properties as they really are, means in consequence that the Risk Number values represent the risk of endangerment for the investigated sculptures objectively and realistically.

Figure 4: Simplified categories for marble: “little endangered” – “endangered” – highly endangered”.

Model calculations also permit a prediction about the decrease of the risk for a sculpture when moving it from an outdoor exposure to a depot. In these cases, the risk decreases by about 20 %, which is a considerable reduction. However, the risk in a depot cannot be completely zero either, because the sculptures still underlie a climatic effect, albeit to a lesser extent. Also, some risk factors such as low ultrasound velocity remain, even if there will probably be no further deterioration in a depot.

Overall results show that the Risk Number is an appropriate tool to all owners who wish to examine their sculpture stock and determine the risk of endangerment. Although the Risk Number does not give specific instructions about what measures are required, a high number indicates the main risks. It is therefore a useful tool in the discussion about necessary conservation measures.