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The Tone Of The Bell

The Tone Of The Bell image
Parent Issue
Day
6
Month
August
Year
1897
Copyright
Public Domain
OCR Text

There is a general belief that the introductiou of silver or gold in the casting of a bell assures for it a superior tone, but an expert in founding hells says that such a belief is erroueous. He says that the best toue effect in bell metal is confined ■withiu very narrow limits, for any so called bell metal having more thau 80 parts copper to 20 parts tin is too soft to produce the best quality of tone, while that having more tin than 23 parts in the 100 is much too brittle. There are bel Is in Europe wbose clear tones were for many years credited to gold and silver that were supposed to have been added to the bell metal. An analysis was made not long ago of the metal in one of these bella, aDd it failed to show any trace of gold or silver. The oíd Germán bell founders used to make their bells of 80 parts copper to 20 parts tin. In the opinión oí this expert the strongest and best toned bell is obtained f rom 79 parta copper and 21 parts tin. "Af ter the bell is 'drawn,' " says the expert, "two sweeps are made aud adjusted to an upright spindle in the center of an iron case or flask, the flask having perforations all over it. Over the surface of the flask is coated, wet, a layer of loam of equal and suitable thickness and baked. Then another layer is coated on and baked, and so on, layer after layer, until the proper shape, etc. , are secured. There are two such iron molding cases, one fitting over the other. The uuder one has the loam coating on its outer side, which has the inner shape of the proposed bell. The upper iron molding case or flask has the loam on its inner snrface, forming the outside shape of the bell. This is let down over the under mold and carefnlly adjnsted eqnally all aronnd, leaving a space inside between the two molds. The under flask is called the core. The upper or outer one is called the case. The space is filled up by the molten bell metal, which, when cooled, is the bell. "When the bell is taken out of the molds it is polished, and then the hangings, tongue (or dapper), etc., fitted to the bell, and it receives a severe riuging test, partly to ascertain its tone and resonant quality and to observe its mechanical excellence and adjustment. Then, if it appears to be good in all points, itisshipped to the purchaser. The making and shipping of a bell usually requke from 10 to 15 days in the smaller sizes. The larger sizes - i. e., from 1,500 pounds and heavier - require more time. A peal of three or more bella requires from 40 to 90 days' time, while a chime of nine or more bella requires from three to six months. "Any foundry can, of course, readily make and select nine or ten bells in tune for a chime, br tune is one thing, tone is another. "-

Article

Subjects
Ann Arbor Argus
Old News