An elevator for raising and lowering a string in a wellbore includes left and right bodies hinged together that selectively open and close. A probe has a cannula having an open end defined at a distal end and adapted to couple to a power source. A method of making the gelled food product includes the step of warming a quantity of milk over a low heat, adding a stick of cinnamon, then adding sugar, pecans and a food preservative to the warming milk. The treatment is thus effective substantially exclusively on the surfaces of the end facets to be treated. When multi-color display is to be implemented, the electrode head applies ac voltages between the substrates and moves the particles to peripheries of portions so as to expose the back substrate at those portions. The electrically conductive layers 31, 36 are formed on the surface of the tubular glass lamp vessel 10 by solder material.