Great Engineers - 10: - Sir John Wolfe Barry

Author: Edwards, A Trystan

Date published

N/A

First published: N/A

Price

Standard: £9 + VAT
Members/Subscribers: Free

Buy Now

Added to basket

Back to Previous

Great Engineers - 10: - Sir John Wolfe Barry

The Structural Engineer
Great Engineers - 10: - Sir John Wolfe Barry
Date published

N/A

First published

N/A

Author

Edwards, A Trystan

Price

Standard: £9 + VAT
Members/Subscribers: Free

Buy Now

BEFORE Sir John Wolfe Barry was called into consultation, the main outlines of the Tower Bridge had already been decided upon. Sir Horace Jones, the City Architect, had submitted several designs to the Bridge House Committee, which, evolving through several stages, finally assumed a form not unlike the actual building. It may be of interest to study some of Mr. Horace Jones’s preliminary sketches, because these throw light upon the aesthetic problem which required to be solved. Figure 3 shows his first design for a bascule bridge, while Figure 4 was the one which held the field when Sir John Wolfe Barry was appointed engineer to the scheme. It was considered that any arched form of construction (such as Figure 3)across a span to be used by masted ships was inadmissible, and that whatever headway was given should be absolutely free of obstruction throughout the whole of the span. Sir Horace Jones, unfortunately, died in 1887, when the foundations had not made much progress, and up to that time none of the architectural designs had proceeded further than such sketches and studies as were barely sufficient to enable an approximate estimate to be made of the cost. After the death of Sir Horace Jones, the general architectural features of the Parliamentary sketch designs were preserved, but it will be seen that the structure as erected differs largely therefrom both in treatment and material. The width and, consequently, the weight of the bridge was increased by the requirements of Parliament, and the span of the central opening was enlarged from 160 feet, as originally intended, to 200 feet. At the same time the provision of lifts and stairs to accommodate foot passengers when the bridge was open was felt to be a necessity. It thus became apparent that it would not be possible to support the weight of the bridge on towers wholly of masonry, as in the first design, unless they were made of great size and unnecessary weight. It was therefore necessary that the main support should be of iron or steel, which could, however, be surrounded by masonry, so as to retain the architectural character of the whole structure. It was clear that in any event a large part of the steelwork of the towers must be enclosed in some material, for the moving quadrants project upwards some forty feet from the level of the roadway, while the stairs and lifts also required protection from the weather. It thus became a question of surrounding the towers either with cast-iron panelling or with stone, and eventually a granite facing with Portland stone dressings was adopted. A. Tryston Edwards

Additional information

Format:
PDF
Publisher:
The Institution of Structural Engineers

Tags

Issue 10

Related Resources & Events

The Structural Engineer
Correspondence on The Revised British Standard Sections

Correspondence on The Revised British Standard Sections

Sir,-Mr. Arthur E. Pierce objects to the word " discarded " as used in my article, but his objection is not relevant.

Price - £9
The Structural Engineer
Steel-Framed Beet Sugar Factories

Steel-Framed Beet Sugar Factories

BEET sugar manufacture, the younger competitor of the cane sugar industry, had its birth in 1747, when a German chemist drew attention to the sugar content of the beetroot, but it was not until 1799 that a method of extracting sugar from the beet was invented. Shortly afterwards, a factory was erected in Silicia under the patronage of the King of Prussia, who partly financed the undertaking as an encouragement to German agriculture. Numbers of other factories rapidly sprang up in Prussia and Bohemia, and in 1811 the industry was introduced to France by the Emperor Napoleon, who desired to make France independent of outside sugar supplies. Although the industry was at first a purely military measure, and therefore declined when peace once more settled over Europe, it had as rapid revival about 1830, when European farmers realised the advantages of beetroot cultivation, and offered the sugar factories supplies of roots at low prices, and the growing of beetroots and the manufacture of beet sugar spread rapidly throughout Europe.

Price - £9
The Structural Engineer
Rectangular Members with Double Reinforcement

Rectangular Members with Double Reinforcement

In this article the writer is dealing. with some additions to his previous, paper published in the April, 1925, issue of the "Structural Engineer." (Vol. III., Number 4). The underlying theory is given in that issue and is not repeated here. Harry Zimmerman

Author - Zimmerman, Harry
Price - £9