ROSE ENGINE

In Mechanics, an appendage to the turning lathe, by which a surface of wood or metal, as a watch-case, is engraved with a variety of curved lines. The a emblage of these lines presenting some resemblance to a full-blown rose, is called by the French roscttt; and hence the engine by which tbe ornament is produced is called a rose engine. The mechanism by which the figures are produced is sometimes called a camb, and may be described as follows:" A wheel upon me axle C turns uniformly in the direction A B I) E. A rod m n moves in guides, which only permit it to ascend and descend perpendicularly.Its extremity m rests upon a path or groove raised from the face of the wheel, and shaped into such a curve that as the wheel revolves the rod m n shall bo moved alternately in opposite directions, through the guides, with the required velocity. The manner in which the velocity varies will depend on the form given to the groove or channel raised upon the face of the wheel; and this may be 250.)shaped so as to give any variation to the motion of the rod to n which may be required for the purpose to which is to be applied." {Gardner's Mechanics, Cabinet Cyclopedia, p. The purpose of the machine is therefore to convert a unl form rotatory movement into a varied rectilinear and alternating movement. It is also used in macninery for spinning, and for lace-making. ROSEMARY (Lat. ros mar in us, sea dew), is the name given to a small evergreen' shrub of the Labiate1073 order, which inhabits rocky hills in the neighbourhood of the Me»U [s. 1087]