A method of embossing a sheet material includes: heating at least a portion of the sheet directly or indirectly with radiant energy from a radiant energy source; pressing a tool against the heated portion of the sheet, thereby patterning a surface of the sheet; and separating the sheet and the tool. In a first embodiment, the present invention includes a vertical frame, formed, for example of conductive material, surrounding the outer perimeter of the bonding pad, and extending through an underlying insulating layer. Based on the wavelength of incident light, the retardation value ReF of the phase retardation layer is set approximately equal to, and the retardation value ReL of the liquid crystal layer is set approximately equal to. Such kits may include the teaching system described above and may further include instructor-targeted materials communicating use of the system to the instructor. 0 parts by weight of a metal phosphate and 0. A flow switch actuates the arm assemblies when a drilling fluid pressure exceeds an activation value and the drilling apparatus includes a biasing member to reset the arm assemblies when the drilling fluid pressure falls below a reset value.