Freezing
In stone, freezing damage occurs when water within pores and fissures freezes, expands, and repeatedly stresses the material.
Techniques
Lines of Coincidence
In proportional or transfer methods, lines of coincidence are reference lines established so corresponding positions on a model, drawing, grid, or block can be aligned and compared.
Points of Coincidence
Corresponding reference points established on a model and the work being transferred, enlarged, or reduced.