By J.F.A. Moore
There's progressively more constructions that require expert judgements to be made approximately their endured safeguard and serviceability. even supposing social and financial matters are usually all-important affects, the technical concerns however must be addressed objectively, successfully and reliably. the purpose of this publication is to compile these strategies that are used successfully to watch development buildings.
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Recommendations are made based on the use of graduated rulers, which should be of matt, chrome-faced steel graduated in full millimetres on both edges of one side. g. tapers, steps, shear and compression. Weathered edges and dirt may be signs of a crack of some age, possibly no longer active. Other signs of movement, such as pipes, parapets and distortion of doors and windows may be diagnostic and should be recorded. Planned systematic procedures for recording information will ensure its later correct interpretation, and transcription should be avoided as far as possible to prevent the introduction of errors.
1 mm accuracy. The measuring exercise was very slow and time-consuming, requiring several rounds of angles to each point. Reduction of angles and triangulation computing was also a slow and laborious process. With modern electronic theodolites with dual-axis compensation, measurement to the same accuracy can be achieved with half the number of observations, as it is unnecessary to observe on two faces. Angles can be logged automatically and the data can be passed directly to computer for calculation.
10 is, for example, 20 metres wide and of similar height, the convergent solution would produce results approximately two and a half times more precise than the results of the parallel solution. 9 Camera geometry—parallel option. The cameras are sited to create the optimum achievable ratio between the object distance and the camera base. In this case a ratio of less than 2:1 has been achieved through the use of a wide-angle lens system. 10 Camera geometry—convergent option. Compared with the parallel option, the object distance to camera base ratio has reduced from approximately 2:1 to nearer 1:2, permitting a 90° intersection angle over the centre of the facade, diminishing towards the edges.