ABSTRACT
Temporary work includes the timbering for excavations, the erection of scaffolds, gantries, shoring, and the construction of centres and all works raised for the convenience of the workman in building the permanent erection; which are removed on the completion of the building. Permanent work includes all timbering that forms part of the structure, such as wood floors, partitions, half-timbered work, and roofs which remain on the completion of the building. A framework of timber arranged to temporarily support the voussoirs of arches during their construction is termed a centre; they must be constructed sufficiently strong to resist any deforming stresses, and require to be carefully and rigidly put together; but as they are only for temporary work, care should be taken to frame them so as to do the timber the least amount of injury. The needles should be removed first, then the strutting from the windows, the strutting under the floors inside, and, lastly, the raking shores.
