Occurrence of Attributes in Original Text

The text related to the cultural heritage 'Sydney Opera House' has mentioned 'Arch' in the following places:
Occurrence Sentence Text Source
The pins in the arches were surveyed at the end of each day, and the information was entered into the computer so the next arch could be properly placed the following day.
This solution allows arches of varying length to be cast in a common mould, and a number of arch segments of common length to be placed adjacent to one another, to form a spherical section.
Ove Arup and Partners' site engineer supervised the construction of the shells, which used an innovative adjustable steel-trussed "erection arch" (developed by Hornibrook's engineer Joe Bertony) to support the different roofs before completion.