Aqueous emulsions of a silicone resin are disclosed that provide a solid silicone resineous coating upon removing water from a film of the emulsion. The present invention also provides a technique for determining the conditions for protein crystallization easily with high efficiency; namely, a method of screening the conditions for protein crystallization and a protein crystallization screening reagent. For a helicopter visual landing in rough seas, low visibility and darkness, the approach for landing becomes a hazardous task. The support is movable andor pivotable relative to a frame, such that the scan axis can be vertical or horizontal.