. Le génie ferroviaire et de locomotive : une revue pratique de la force motrice ferroviaire et du matériel roulant . ;::EiRineerins vol. XIX Droit d'auteur par Angus Sinclair Co.—1906 UN journal pratique de chemin de fer Motive Power and Rolling stock 136 Liberty Street, New York. Septembre 1906 ponts de Bascule. Dans ce que l'on appelle les agesOJie moyen doit rechercher probablement le premier exemple du pont mobile. Ces jours-là, quand le baron dans le bastion hishonold, entouré par ses retaineret ses hommes-aux-bras, était un pouvoir de bereckoned avec, souvent d'être placé pla. Il couvrait la lande, et il se lavait au seuil de
1909 x 1310 px | 32,3 x 22,2 cm | 12,7 x 8,7 inches | 150dpi
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. Railway and locomotive engineering : a practical journal of railway motive power and rolling stock . ;::EiRineerins Vol. XIX. Copyright by Angus Sinclair Co.—1906 A Practical Journal of Railway Motive Power and Rolling Stock 136 Liberty Street, New York. September, 1906 Bascule Bridges. In what are called the middle agesOJie must look for probably the firstexample of the movable bridge. Inthose days when the baron in hisstronghold, surrounded by his retainersand his men-at-arms, was a power to bereckoned with, often to be pla- placed. It spanned the moat, and it washinged at the threshold of the castleentrance so that when lifted into a ver-tical position it would completely coverthe doo.rway and cut off the castle fromall conmumication with the outerworld.The castle drawbridge was therefore of the doorway. They wereover pulleys, below which, andthe walls, the loose ends of thehung, and to these ends heavyof stone or iron were attachedpurpose of balancing the weightbridge, and of assisting those inraise it as occasion required. No. 9 carriedinsidechains masses for theof the side to. DOUBLE ROLLER LIFT BRIDGE ON THE CHICAGO TERMINAL TRANSFER RAILROAD. cated by the king or to be reduced tosubjection by physical force. In timeslike those the barons castle was afortress and was built with the inten-tion of being able to withstand asiege. It was generally composed ofone or more massive stone towerssurrounded on all sides by a huge ditchor moat, filled with water. At themain doorway the drawbridge was a part of the scheme of fortificationwhich was carried out in every detailof the building. The bridge, hinged atthe castle end, rested on the far bankof the moat, when open for traffic, aswe would say. To the outer end of thebridge a pair of chains were attachedand these were carried up at an angleand passed in through openings in thecastle walls about the height of the top Sometimes two huge beams hung outfrom the walls over the edges of thebridge and from the beam ends
