Abstract: From the time that they are immersed into a marine environment, bronze propellers are prone to attack by marine organisms, such as barnacles, coral and algae, which attach themselves to the bronze metallic surface, creating lumps on the propeller, which adversely affect its balance and cause impedance and vibration of the propeller and its boat in the water. Ant-fouling paints are either too toxic for the marine environment of lack smoothness on the surface. These problems have been overcome by a combination of known steps, namely, polishing the propeller to prepare it for electroplating, cleansing to remove all traces of dirt and grease, electroplating with copper to a depth of at least 0.005″ or 0.15 mm, followed by spraying with a standard solution (5%) of sodium hypochlorite and sodium chloride in a suitable container to form a firmly adhering conversion coating of basic cupric chloride and then sealing for at least twenty-four hours.

Abstract: From the time that they are immersed into a marine environment, bronze propellers are prone to attack by marine organisms, such as barnacles, coral and algae, which attach themselves to the bronze metallic surface, creating lumps on the propeller, which adversely affect its balance and cause impedance and vibration of the propeller and its boat in the water. Anti-fouling paints are either too toxic for the marine environment or lack smoothness on the surface. These problems have been overcome by polishing the propeller to prepare it for electroplating, cleansing to remove dirt and grease, electroplating with copper, followed by spraying with a standard solution (5%) of sodium hypochlorite and sodium chloride and allowing sufficient time for a reaction of the hypochlorite solution with the copper to form a firmly adhering conversion coating of basic cupric chloride. The coating is blue-green in color.

Abstract: The disclosure is directed to a method of masonary cutting and to the structure of a novel tool. The tool has twin outwardly splayed and flared chisel like blades which join the handle at a recess groove for waste ejection. The blades are beveled only on their upper edges and are driven forward by hammering on the remove handle end. The method comprises attacking a flat masonary surface at an angle greater than 5 degrees (preferably at 13 degrees) with twin divergent cutting edges beveled only on the upper surfaces and having a flat lower surface. Material is imploded between the blades and ejected at the recess groove without dust formation.