PAD] ( 92 ) 



Overhead Travelling Crane. Consisting of girders spanning a 

 building, etc., and provided with wheels to run on rails. 

 Supported on overhead gantries, along which it travels by 

 hand or power gear. The lifting is effected by means of a 

 crab which traverses across the span on the main girders 

 of the crane. Modern cranes of this type are often provided 

 with three electric motors, one for lifting, one for cross 

 traverse, and a third for moving along the gantry. 



Over-mantel.- A special fitment in wood, stone, or plaster, to 

 which sculpture, carving, and painting may be added, that 

 occupies the space intervening between the mantel and the 

 ceiling of an apartment ; it is usually found to be the most 

 ornate part of an interior dating from the fifteenth to the 

 nineteenth century. See "Mantle-tree," "Mantel-shelf," 

 and " Mantel-piece." 



Ovolo. A moulding, the vertical section of which is in Roman 

 architecture a quarter of a circle. In Grecian architecture 

 it is elliptical, or, rather, egg-shaped. 



Oxylene. A process claimed to render wood uninflammable. 

 See " Fireproofing Timber." 



Packing Cases. Large boxes used for packing goods or mer- 

 chandise for transit, mostly in the export trade. Those 

 of small size are usually termed " boxes," or " cases." 

 Plywood is now playing an active part in this branch of 

 the wood trade. 



Packing-case Wood. Sawn wood, not of a high class, used in 

 making " packing-cases." Some large consumers elect 

 to use "logs" or "square whitewood sleeper-blocks" 

 and convert them into boards. See " Packing Cases." 

 See "Firewood." 



Packing and Packing Pieces. Mainly used in sawmills in connec- 

 tion with " circular saw beds " to pack or steady the saws 

 when running or cutting. They vary from hempen matter 

 to wood. 



Pad Saw. A small narrow saw fitted to a handle or pad, into 

 which it can be telescoped when not in use. See " Keyhole 

 Saw." 



