rubstone

A stone, usually of sandstone, used to sharpen instruments; a whetstone; spec if., the flat stone on which the currier's knife is ground to an edge. trû-bāçe, trû-bă e', s . [Lat. rube us red.] Min.: (1) Rock-crystal from Brazil, inclosing red scales of hæmatite or göthite; (2) rock-crystal which, when heated and plunged into a cool colored solution, becomes fi ured, and admits the red coloring matter; (3) rubicelle (q. v.); (4) Rose-quartz (q. v.). rû-ba-tō, a. [Ital. stolen.] Music : A style of singing or playing in which IMG:content-0791.png:[blocks in formation] proportionately contracted, so that the aggregate value of the bar is maintained. rŭbbed, pa. par. or a. [RUB, v.] rubbed-work, s. IMG:content-0792.png:[blocks in formation] 1. Electricity: (1) That part of an electrical machine which rubs against the cylinder or disc. (2) The moving pad or piston of an electrophorus. 2. Mason .: A board or block used in grinding or polishing. In the moldings of stone, an iron rubber mounted on a wooden stock is employed for fillets, beads, and astragals. These rubbers have convex or concave faces, according to the required contour of the work. A stone or wooden block covered with thick felt is used for polishing stone and marble. 3. Naut .: A tool for flattening down the seams in sail-making. 4. Vehicles: The part of the wagon-lock which pre es against the wheels. rubber-cloth, s. 1. Fabric covered with caoutchouc. 2. Caoutchouc in sheets.