Light-projecting of installation-location patterns onto installation surfaces

A method of installing refractory anchors on installation surfaces of thermal vessels, the method comprising:

• mounting a light module in place on a support;
• positioning the light module so the light module is directed at the installation surface;
• operating the light module to project a predefined pattern of multiple lighted indicia onto the installation surface, wherein the lighted indicia in the pattern define installation locations for the refractory anchors;
• installing the refractory anchors at the installation locations on the installation surface of the thermal vessel by using a handheld weld gun;
• and
• repeating the positioning and installing by transversely repositioning the light module from a first position to a second position so that at least two of the lighted indicia projected onto the installation surface with the light module in the second position are located where there are or were at least two of the lighted indicia projected onto the installation surface with the light module in the first position,
• wherein operating the light module includes emitting divergent light beams to project the lighted indicia onto the installation surface, and wherein positioning the light module includes linearly adjusting the light module closer to or farther from the installation surface to adjust an actual indicia spacing until the lighted indicia have a correct indicia spacing.