552 SEC. 12. APPLIED MECHANICS. 



Sustaining Buoys of Cork with lines or gear complete for 

 the " Whitehead" Torpedo. 



London Ordnance Company. 



Original Drawing of the Semaphore at the Admi- 

 ralty, Whitehall, with code of signals and their method of 

 arrangement. Gardner Collection. 



Exterior View of the Admiralty with Semaphore in 



action. Gardner Collection. 



XII. BRIDGE CONSTRUCTION. 



2008. Diagrams for Bridge Construction : 



a. Resistances of materials, tension, and compression. 



b. Girder on two supports. 



c. Graphic treatment of arches for bridges. 



d. Construction of iron bridges. 



Prof. Hcinzerling, Aix-la- Chapclle. 



2009. Photographs for the study of Construction : 



a. Bauwaage (curves of construction), a symmetrical parabola. 



b. Bauwaage (curves of construction), circle. 



c. Bauwaage (curves of construction), segment of a circle. 



d. Bauwaage (curves of construction), ellipse. 



e. Bauwaage (curves of construction), aclinoid. 



f. Bauwaage (curves of construction), cubic parabola 



as lines of equilibrium. Prof. Heinzcrling, Aix-la- Chapelle. 



2092. Model of the roof of the new Polytechnic School at 

 Dresden. Bock and JIandrick, Dresden. 



2093. Three Models of railway bridges at Niederwarthe, 

 Corvey, and Zserks. Bock and ITandrick, Dresden. 



2O93a. Cartoons (3), showing the Terminus, in London, 

 of the Midland Railway, called St. Pancras Station. 



W. H. Barlow, F.E.8. 



1. General plan of station. 



2. General section of station roof and flooring, with an enlarged section of 

 one rib, showing mode of connexion with purlins. Elevation of part of one 

 rib, showing the method of carrying the sash bars and ventilators. 



3. Tha timber staging used by the contractors in erecting the roof. 



