expanding mandrel

A mandrel having fins expansible in radial slots to bind against the inside surface of rings, sleeves, or circular cutters placed thereon. § 1. II. Technically : 1. Comm.: Increase in trade or liabilities; an increase in the i ue of bank-notes. 2. Math .: The development and expre ing at length of an expre ion indicated in a contracted form; as the expansion of (a+b)3 is a3+ 3a2b +3ab2 +63. 3. Nat . Phil .: The increase of bulk or surface which a body undergoes from the rece ion from any cause of its particles from one another, so that it occupies a greater space, while the weight remains the same. Heat is the most common cause of expansion. 4. Ship build.: The expansion of the skin of a ship, or rather of a network of lines on that surface, is a proce of drafting to facilitate the laying-off of the dimensions and positions of the pieces of which that skin is to be made, whether timber planks or iron plates. It consists in covering the surface with sets of covers, a network of twoich cro each ceiving the sides of those meshes to be inextensible strings, and drawing the network as it would appear if spread flat upon a plane. By this operation the meshes are both distorted and altered in area; the curves forming the network preserve their true lengths, but not their true angles of intersection; and all other lines on the surface are altered both in length and in relative angular position. The proce is applied to surfaces not truly developable. [DEVELOPMENT.] 5. Steam : The increase in bulk of steam in a cylinder. The method of working steam expansively was invented by Watt, and was the subject matter of his patent of 1782. By it the supply of steam from the boiler to the cylinder is cut off when the latter is only partially filled, the remainder of the stroke of the piston being completed by the expansion of the steam already admitted.