Abstract: A method for displaying the migration of lane oil over bowling alleys during play comprises the steps of incorporating an additive into the lane oil that is non-discernable when viewed with ambient light; applying the lane oil and incorporated additive to the surfaces of a bowling alley in a conventional manner; and selectively illuminating the surfaces with light from a portion of the electromagnetic spectrum having a wavelength to which the additive is responsive, thereby rendering detectable the presence of the lane oil and the migration thereof over the bowling alley.

Abstract: A method for enhancing golf green contours for television broadcasts comprises the steps of providing a grid pattern (32) of intersecting parallel lines (38, 39) over the surface of a golf green (10), recording the grid pattern, and broadcasting the grid pattern onto a television screen (33) simultaneously with the broadcast of the golf green during play thereon, whereby contours presented by the green are more clearly depicted by the grid pattern. The method is practiced with relative simple equipment and without interfering with play of the game. A related method can be employed for enhancing contours of other land surfaces for broadcast purposes.