Abstract: A method and apparatus to implement a trolling device. The trolling device can assist maritime sports fishermen in defining the actual water depth and/or water temperature of the location at which a lure is situated in troll. The readings from the device enable an angler to adjust variables such as boat speed, length of line deployed and ballast weight to adjust to desired depth. The device comprises a temperature sensor, a pressure sensor, a micro-controller chip, a printed circuit board, an LCD display, and a cycle switch, all housed within a dense metal (for ballast), water-proof body designed specifically for deep marine submersion and in-line trolling. The device has a pre-programmed data-logging algorithm that is activated by a fisherman via a magnetic controlled reed switch prior to letting out trolling line with the device set in-line to the trolling gear. Upon retrieving the device, the fisherman can view the data to place or reset the trolling lures/rigs, as necessary, at the appropriate zone.

Abstract: A light cover has a transparent element manufactured from polycarbonate and an infrared filter angled so as to reflect infrared radiation emitted from a light source way from both the transparent element and the light source.

Abstract: The present invention relates to novel compounds of the formula ##STR1## wherein R.sub.1 is an alkyl group, M.sup.+ is a cation, R.sub.2 is an alkylene oxide and n is an integer from 1 to 4. Surfactant compositions containing these novel compounds, the process of preparing these novel compounds as well as the methods of using these surfactant compounds in enhanced oil recovery, as emulsifiers, in emulsion polymerization, as hydrotropes, in foamed drilling fluids, as dye carriers, as textile detergents, as foaming agents for concrete formation and as fiber lubricants are also disclosed.