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I. Answer the following questions:

1. How did the method of sinking the foundations work?

2. What was the reason for making spans longer?

3. Who set a new pattern for covered bridges in the United States? What was it?

4. Why is it necessary to know stresses in trusses? Who was the first to analyze it?

5. How is lateral stiffness achieved?

6. How can you prove that Niagara Bridge confounded nearly all the engineering judgment of the day?

LANGUAGE FOCUS

II. Match the meanings of these terms with their definition:

deck, wrought iron, cantilever, lattice, caisson, truss, stress, masonry, girder

1. a stonework

2. watertight chamber for underwater construction work

3. framework supporting a roof, bridge

4. pressure or tension

5. tough malleable form of iron suitable for forging or rolling, not cast.

6. a horizontal structure member supporting vertical loads by resisting bending. 7. an assembly of smaller pieces arranged in a gridlike pattern; sometimes used a decorative element or to form a truss of primarily diagonal members.

8. the top surface of a bridge which carries the traffic.

9. a structural member which projects beyond a supporting column or wall and is counterbalanced and/or supported at only one end.

III. Choose the correct preposition:

Bridge building (for, in, with, by) masonry, arches supported (on, with, through, in) slender piers, the construction (on, with, by, of) arches ( as, in, with, by) the cantilevering method, a viaduct (in, by, of, across) trussed-girder design (along, according to, with, on) the rail line, timber deck was replaced (into, by, with, instead of) a steel deck, the strength (in, of, off, by) cast iron (in, with, on, through) compression, horizontal timbers connected (with, by, in, without) a network (of, with, across, in) diagonal planks.

IV. Put the correct form of the words into the sentences:

Though extremely…, wood has one obvious disadvantage – it… . Wernwag's Colossus, destroyed by fire in 1838, is but one example of many … wooden bridges lost in this manner throughout history.

There was another material, however, whose use at the end of the 18th century offered bridge engineers an … to the traditional materials of timber, stone, and brick.

Although it had first been used in antiquity, iron was the miracle material of the … Revolution. The Greeks and Romans had used it to … stone pediments and columns in their temples and iron links had been forged by the Chinese and used in … bridges.

versatility

burning

outstand

alternate

industry

reinforcement

suspend

V. Every person whose name was mentioned in the text contributed much into bridge building history. Try to recollect their achievements: Squire Whipple, Hans Grubenmann, Charles Labelye, Roebling, James Buchanan Eads, Robert Stephenson

VI. Continue completing the table:

The period and the country

Type(s) of the bridge

Materials used

Difficulties

1.

Beam bridge

2.

stones

3.

Ancient Asia

4.

The Middle Ages

5.

The Renaissance

6.

The 18th century

7.

The 19th century

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