1851 Great Exhibition: Official Catalogue: Class VII.: Josephus Jagger Roebuck

30. ROEBUCK, JOSEPHUS JAGGER, Huddersfield — Producer.

Model and drawings of No. 4, skew arch of the Huddersfield viaduct, built in stone, over the Bradford Road. Scale one inch to three feet.

Model of one of the springer quoins, showing the oblique checks for the insertion of the voussoirs of the spiral courses of masonry.

Model of springer course complete, showing the whole of the checks.

Models of two of the arch quoins, showing the form and twist of Nos. 4 and 5 arch quoins of the obtuse angle of the arch.

Model of one of the spiral courses of the voussoirs, showing the spiral plane from the acute angle of the arch.

Drawing of No. 4 skew arch of the Huddersfield viaduct, by which the above model and detail models were constructed. Scale one inch to six feet.

[Skew, or oblique arches, are those the faces of which are not at right angles with the abutments. It is believed that the first skew bridge was built by Mr. W. Chapman, in 1787, over the Kildare Canal, near Naas. The method of finding the directions of the courses of brickwork or masonry, and the shapes of the various moulds for the latter, are explained fully in treatises on oblique arches. — S. C., jun.]

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