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Moscow Bell Centre has been acting since 1995 by His Holiness, Holy Patriarchy of Moscow and all Russia Alekseys II blessing, with the aim of preparing highly qualified bell ringers for Russian Orthodox Church. All wishing to study, primarily those recommended by temples and monasteries, are accepted. The period of studies is 3 months. The program consists of theoretical courses, as well as practical studies of church toll. An official certificate is given after finishing studies.

About bells quality

ABOUT BELL FOUNDINGS QUALITY

Bells sound is one of the most important criteria of its process quality. What shall we pay attention to, when ordering bells and their receiving?
1) Bells ringing should be calm, without croaking and strong beats, which tell about foundings defects, bells wrong shape and asymmetric allocation of its mass.
2) If high tones are quickly disappearing (so called cluster sounding) after a beat (especially with large bells) and only rumble remains (i.e. only undertones sounding), this means that the alloy is of low quality or the founding is porous, friable and has internal defects.
3) One of the most important qualitys criteria is the time of sounding. It should at least 5 seconds for little (over-toll) bells, at least 10 seconds for middle (under-toll) bells and at least 20 seconds for large (toll) bells, at 1 meter distance. Otherwise its a defect in founding or presence of flaw in the bell.
4) If you compare the main tone undertone (i.e. the lowest and the longest overtone) of different bells of the same weight, but from different producers, youll see that it varies to several half-tones. Unfortunately, nowadays some bell-founders and their dealers advertise their bells as sounding lower, then others (e.g. comparing with bells of "Pyatkov and Co" partnership association in Kamensk-Uralsky), thats why they proclaim rhetorically: why should you buy larger bells with the same tone? In fact, its black advertising for such misfortune-producers, as the practice shows that bells of lower tones sound worse and flaw quicker.
What the matter here? The answer to this question is given in Hladneys formula of bells conformity.

F~T/D²√E/p


where: F is soundings wave frequency, T thickness, D diameter, E elastic modulus (Youngs modulus), p materials solidity (specific gravity).
Bells certification, held by Bells' Centre, shows that practically everyone of our bell-founders use the same basic data for Russian profile, including thickness-cut diameter ratio (1/14), and Olovyanishnikovs method of creating profile. Thats why, comparing sounding of the bells, familiar in size, you needn't use thickness-diameter ratio.
As for specific gravity, it varies only a little and tells about brass and stannary balance and presence of secondary impurities.
The last is elastic modulus E, which tells firstly about foundings quality (if it is dense or fozy, if its porous or has some defects in form of flaws). It can also determine if the alloy was produced rightly - it should contain 80% of brass and 20% of stannary (with 2-3 % variance of this balance) and the amount of impurities not more than 2-3%.
Some bell-founders are not improving foundings quality (i.e. rising elasticity) to lessen the probability of their products' split, but specially lessen the concentration of stannary, increasing material ductility, but the fact is that the sound looses its power, becomes less harmonious, pitch level lessens.
At last, theres only one conclusion to be made while materials elasticity is high, the quality of its founding is better, persistence for beating is larger and its mode is higher.
Taking to consideration that v / is sounds speed in metal, we have decided to check Hladneys formula and conclusion made, measuring sounds speed in bell's bronze for the bells of the same size (about 40 poods in weight) from different producers. We should keep in mind that maximal sounds speed in bronze with high concentration of stannary is ~ 4750 mps). Undertones meanings are real, measured during the process of certification.

Enterprises name Undertones meaning/td> Sounds speed (mps)
"Pyatkov and Co partnership association,
Kamensk-Uralsky
H, small octave 4550 - 4650
LITEKS, Moscow G-sharp, small octave 4450 4550
Vera", Voronezh G, small octave 4350 4450
ITALMAS,
Tutaev, Yaroslavl region
F-sharp, small octave 4250 4350

As you see, our conclusions were right. So, if you are offered to buy bells of the same size and weight, but having different meanings of the main tone - undertone, what bell would you choose from the point foundings quality? Right you are, the bell, which has the highest undertone!



Contacts:
   common questions: info@bilo.ru
   director: bells-centre@yandex.ru
   the museum: museum@bilo.ru
 
Telephones:
   work: (495) 957-27-10,
   tel/fax: (495) 438-29-53,
   mobile: (903) 768-45-65
Adress:
   113035, Moscow, Raushskaya embankment, house 26/1,
   the temple in honour of Saint Nikolay in Zayaitskoe (in the bell-tower).
   It works on weekdays from 10 till 19.