WHITECHAPEL BELL FOUNDRY

RADIAL BELLFRAMES

Recent design with
semitones in centre

It has long been understood that rigidity of both bellframes and towers are essential if bells hung for change ringing are to handle in a proper and predictable manner. This requirement for rigidity becomes increasingly important as the size of the ring increases; largely due to the fact that the power to weight ratio of bellringer to bell diminishes with increased bell size.

To minimise the effect of moving towers Whitechapel has always attempted to arrange bells in such a way that the distribution of loads swinging east-west and north-south reflect the relative strengths of a tower in those two directions. Even when bells are hung in the most advantageous configuration Whitechapel observed that those bells hung closest to the centre of the tower were less affected by tower movement than those hung in the corners. This observation led to the conclusion that in addition to any movement north-south and east-west there was also a twisting motion which exacerbated matters beyond those that could be predicted.

In the mid-1930s, Whitechapel was requested to submit proposals for the new Liverpool Anglican Cathedral and to prepare schemes for what was to become the heaviest change ringing peal of bells in the world hung in the highest belfry in the world. Whitechapel was aware that even under the most advantageous conditions handling a bell weighing in excess of 4 tons and where the combined weight of all the moving parts approximated to 5 tons was to be a challenging task for even the most experienced of bellringers. If either the bellframe or tower were to move by any measurable amount the tenor would be rendered almost uncontrollable.

Eventually, and after lengthy discussions with architects and engineers, Whitechapel proposed an arrangement wherein all bells swung through the centre axis of the tower, thereby siting each bell in the most desirable position. At the same time bells were to oriented so that the tenor would swing diagonally in line with the corner of the tower. From this simple but unique arrangement the radial bellframe was born.

At the time, Whitechapel imagined this to be a one-off design solution to suit a unique project. Subsequently however, Whitechapel has been involved in four other radial bellframe projects and summaries of all five projects are given below.


Liverpool Anglican Cathedral. (12 bells, tenor 82-0-11 plus a sharp 2nd semitone.)

William Hughes inspects
Liverpool bells The bellframe is unique not only for being the first radial bellframe but also the only bellframe constructed entirely in reinforced concrete. In order to improve tower rigidity, the forces generated by the bells are brought down into the tower structure via massive steel trusses which spring from the ringing chamber floor and rise through the intermediate sound deadening chamber to give support to the belfry floor and bellframe.

All materials employed in the construction of the tower are relatively hard and comprise mainly steel and reinforced concrete. As hard materials usually encourage "clapper knock", Whitechapel proposed mechanically insulating the bellframe from the remainder of the building so that the thud of clapper against bell could not easily be transmitted down through the tower structure. The bellframe therefore rests upon an insulation diaphragm which separates the bellframe from the supporting structure.

The bellframe and bells were manufactured in the late 1930s however the Second World War disrupted construction. It was not until 1951 that installation was complete.

Washington National Cathedral, USA. (10 bells tenor 32-0-4)

It was to be another 20 years before Whitechapel was to be commissioned to construct a second radial bellframe. In a way, the Washington project was similar to Liverpool in that the belfry was to be positioned high above the ground which increased the risk of excessive tower movement. Douglas Hughes from Whitechapel spent a week in Washington with architects and engineers devising and detailing a range of bellframes for rings of ten bells with tenors between 1˝ and 2 tons. Conventional and radial designs were considered in both timber and steel before a radial arrangement in steel was finally accepted.

The order was finally placed in 1962 for what was to become Whitechapel's second radial bellframe and their first to be constructed in steel. As with the Liverpool bellframe, the Washington bellframe is mechanically insulated from the rest of the building.


Expo Sussex 68. (8 bells tenor 3-3-27.)

Just 3 years after completing the installation at Washington Cathedral, Whitechapel was approached by representatives from the Sussex County Association of Change ringers with a view to creating on a joint display of bell founding and bell ringing at 'Expo Sussex 68' which was to be held at the 150 acre Ardingly showground. It just so happened that Whitechapel had been working on designs for a lightweight steel tower to house a ring of eight bells with a tenor of 4 cwt from 1965 when the company took exhibition space at the Churches and Schools Equipment Exhibition at Earls Court. At that time the proposal was for a conventional bellframe housed within a conventional style of tower constructed entirely of steel, a little like scaffolding. Engineers had managed to design a tower wherein the steel skeleton of the tower weighed just five times the total deadweight of the bells. In fact, the tower was never constructed however the bells were cast and displayed at the exhibition. Although it was natural that this tower design should be considered for Expo Sussex 68 Whitechapel's consulting engineers pointed out that if a tower could be made so that the bells could be swung radially the weight of tower steelwork could be reduced by approximately 50%. They further pointed out that the radial arrangement would not only allow the bellframe to be an integral part of the tower structure but that by careful design the tower could be easily dismantled and transported from one location to another. The photo opposite shows a model of this tower/bellframe.

The Expo Belfry, as it become known, made brief appearances not only at Ardingly but also at a number of other locations up and down the country including appearances at Wembley Stadium, Horseguards Parade and television studios at Teddington. Its last appearance was on the dockside at New York before finding its final home in Chicago.

Unlike the first two radial bellframes, the Expo bells are equally spaced around a regular octagon whilst at the same time the centre of the bells, rather than the ropes, form a perfect circle.

Miami, USA - Trinity Episcopal Cathedral. (8 bells tenor 17-3-20)

Frame assembled at 
WBF prior to shipping When an anonymous donor came forward to offer the Cathedral a change ringing peal together with a completely new tower to house the bells the Dean was anxious that the sizes of both the bells and tower should match the size and status of the Cathedral. For reasons of economy, the architect proposed a cast in situ reinforced concrete tower with hoistable form work and walls just 9 inches thick.

Although the tenor was to weigh just 18 cwt, Whitechapel had concerns about the rigidity of such a tall and slender structure. Whitechapel therefore again proposed a radial bellframe even though the additional space required by the bellframe placed it beyond the agreed footprint of the tower. Ingeniously, the architect devised a bulge in the tower at belfry level to accommodate the relatively large size of the bellframe. In all general aspects, the bellframe is similar to that at Washington Cathedral except that it is smaller and for eight bells. As with the Washington bellframe, the Miami bellframe and concrete support are mechanically insulated from the rest of the tower structure to minimise clapper knock.

Basildon, Essex - St Martin of Tours. (8 bells tenor 11-2-24)

It was in March 1957 that Gillett & Johnston ceased trading as bellfounders and vacated their foundry site in West Croydon. Both John Taylor and Company and the Whitechapel Bellfoundry purchased some of the redundant plant, machinery and stock. Amongst the items brought back to Whitechapel was a ring of six from a redundant church in Colchester which Gillett & Johnston had been storing since the 1930s. Whitechapel continued to store these six bells until, in the late 1970s, ownership of the ring passed to the Church of St Martin of Tours, Basildon. The then Rector, Canon Lionel Webber, worked hard over many years to create a scheme for hanging these bells and during this time Whitechapel submitted a number of proposals based upon the Expo Belfry design. In due course, this idea was taken up by the Basildon Development Corporation's architect, and engineers working for the Parish developed the idea through to the tall, slender, lightweight glass clad structure that has now been built. Initially, Whitechapel proposed incorporating the bellframe requirements into the structure of the tower steelwork thus avoiding the expense of an independent bellframe. Ultimately, the engineers and architect felt that for practical as well as aesthetic reasons an independent bellframe structure should be created. Whilst being broadly similar to the steel bellframes at Washington and Miami, the structure differs in that the frameside pedestals are fabricated from 3" diameter tubular steel. As with the Expo Belfry the bells are placed equally around a regular octagon so that each bell swings centrally and perpendicular to each face of the tower. Like the Expo Belfry, engineers calculated that the radial arrangement of the bells allowed for a relatively lightweight steel structure. Whitechapel was placed under pressure to accept the maximum tower sway possible consistent with the bells being comfortable to ring and additionally to minimise their size requirement for the octagonal plan area of the belfry. In the event, a total deflection of 1.5 mm was agreed, and achieved, whilst the clearance between the flight of the tenor clapper and the glass wall is just 15mm!

As with the Liverpool, Washington and Miami frames, the Basildon frame, which is also supported from a reinforced concrete ring, is mechanically insulated from the remainder of the building.

Resumé

Whilst each of the five projects is unique, the radial arrangement has in each case provided an elegant design solution which not only minimises the effect of the horizontal forces generated by Change Ringing bells but also creates a perfect rope circle without the need to draw any of the ropes from plumb.

Whitechapel has of course proposed radial bellframes for other Change ringing projects. In most cases these proposals have not been taken up partly for reasons of cost and partly due to the general lack of recognition of the benefits of radial bellframes.

What started as a Whitechapel design solution for the world's largest ring of bells has remained a uniquely Whitechapel design feature. The Company has little doubt however that the idea will eventually be copied by others as the several benefits become more widely appreciated.

(That last paragraph proved prescient. This article originally appeared in 'The Ringing World' early in 2004 and since then someone has indeed copied the idea.)

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