Bell 30 / 31Clock bell2026
Hesper
DWG 26-542Drawn from the working profile. Not to print scale.
01Bell details
Our current commission. The profile is drawn and the core is built; the cope goes on in October.
- Commission
- Hour bell, in progress
- Place
- Observatory Tower, Carn Brea
- Inscription
- HESPER · 2026
- Metal
- Bell metal, 78% copper, 22% tin
- Mould
- Loam, swept by strickle
- Tuning
- True-harmonic, five partials
02Tuning record625 Hz nominal
| Partial | Ratio | Measured | Off | Deviation |
|---|---|---|---|---|
| Hum | ·25 | 156.2 Hz | -1¢ | |
| Prime | ·5 | 311.8 Hz | -4¢ | |
| Tierce | ·6 | 374.1 Hz | -4¢ | |
| Quint | ·75 | 469.3 Hz | +2¢ | |
| Nominal | 1 | 625 Hz | 0¢ |
Ratios to the nominal. Cents are hundredths of a semitone; within ±6¢ most ears hear the bell as in tune.
Next bell31 / 311991
Osric
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