A method of bonding two structures together with an adhesive line of controlled thickness is provided. The apparatus includes an optical network unit which converts a downstream signal received from a system operator into an optical signal and transmits the optical signal to an optical cable; and an optical cable modem which receives the optical downstream signal from the ONU and converts the received signal into an electrical signal. In one aspect, the system includes at least one application specific processor having an instruction set having arithmetic operators excluding multiplication, division and power. At least one surface of the promotional token has promotional indicia visible thereon. The use of differential heating histories of different ground points of the same surface material allows the use of a single image acquisition step to provide the necessary variation in measured parameters for calculation of the thermal properties of surface materials.