Abstract: There is provided a floatation device for supporting at least one photovoltaic solar panel above a body of water. Preferably, the floatation device includes a base that is able to float on or in the body of water, and at least one support to position the at least one photovoltaic solar panel at an angle to the base. At least one coupling member is used to couple the floatation device to an adjacent floatation device. In various embodiments an array of floatation devices holding solar panels can be constructed that can be rotated on the body of water to relatively easily track the motion of the sun across the sky during the day. The pitch angle of solar panels can be fixed or varied. Optionally, the base includes at least one opening.

Abstract: A method for marking a bubble vial, including providing a bubble vial body having an internal cavity for holding therein a fluid, the cavity defining an inner surface of the body, and inking a reference marking on the inner surface.