X. BRIDGE CONSTRUCTION. 463 



X. 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. Heinzerling, Aix-la- Chapelle. 



2009. Photographs for the study of Construction : 



a. Bauwaage (curves of construction), asymmetrical 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* Heinzerling, Aix-la- Chapelle. 



2092. Model of a roof. Bock and Handrick, Dresden. 



2093. Model of a bridge. Bock and Handrick, Dresden. 



2O98. Model of Bowstring Bridge, thrown over the canal at 

 Wormwood Scrubs, the tunnel of the Great Western Railway 

 passing under the canal. Council of King's College, London. 



XL COLLECTION OF MODELS AND DIAGRAMS 

 ILLUSTRATIVE OF THE PRINCIPLES OF ME- 

 CHANICS, ROYAL SCHOOL OF MINES. 



2217. Mr. Shelley's Educational Diagrams on the Steam 

 Engine. 



2218. Educational Diagrams for illustration of Applied 

 Mechanics. 



Reciprocating motion in bullet-making machine. 



Cams for bullet-making machine. 



Machine for shaping plugs for bullets. 



Reversing motion in rifling machine (2). 



A parallel motion applied for rolling under pressure. 



Pulleys connected by belts. 



Angle of repose for various substances. 



Screw press. 



