| 摘要 |
This invention relates to apparatus for providing a reference and particularly, but not exclusively, to clamps or brackets for mounting a reference on a footing. In one embodiment the clamp (10) comprises a generally L-shaped body (11), gripping members (12) and reference holding elements (13). When attached to either the external or internal corner of a footing the clamp (10) defines a recess (26) in which a reference member (16) can be held, so that it extends along the intended line of a corner to be built on the footing. The provision of this guide enables corners to be built accurately and quickly. |
