Molten bronze poured in the bell foundry
Bronze bell foundry · casting & true-harmonic tuning

Cast once.
Tuned forever.

We pour bell bronze at 1,150 °C, then tune every bell by hand on the lathe — shaving metal until its five voices ring in true harmony.

Descend into the melt
The signature of a true bell

Five voices,
One bell.

Tuning  ·  0%

Struck once, a bell speaks with five distinct partials. Left as cast they clash; tuned on the lathe they lock into simple musical intervals — the true-harmonic tuning perfected in the 19th century after Canon Simpson. Scroll, and hear them come into tune.

Hum
Octave below the strike
196 Hz
Prime
The strike note
392 Hz
Tierce
Minor third above prime
466 Hz
Quint
Perfect fifth above prime
587 Hz
Nominal
Octave above prime
784 Hz
True-harmonic tuning · after Canon Simpson, 1895 · each partial cut on a vertical lathe
Molten bronze poured in the foundry
From fire to voice

Three acts in bronze.

Loam, cope & core
01 · The mould

Loam, cope & core

The bell is shaped in loam — a core built to the inner profile, a cope struck to the outer. A strickle board sweeps the curve by hand. No two moulds are ever identical.

Loam · cope & core · struck by hand
Bronze at 1,150 °C
02 · The pour

Bronze at 1,150 °C

Bell metal — roughly 78% copper, 22% tin — is melted and poured in a single breath. Too much tin and the bell is brittle; too little and the voice goes dull. The alloy is the sound.

78% copper · 22% tin · poured in one
Cut to true harmony
03 · The tuning

Cut to true harmony

Cooled and broken from the mould, the bell goes on a vertical lathe. Metal is shaved from five precise zones until hum, prime, tierce, quint and nominal align. This is where a casting becomes a bell.

Five partials · vertical lathe · by ear
Recent work

Bells that found their voice.

A bell is named, weighed and struck to a note. These left the foundry tuned true.

Bourdon of St. Vitus
2,340 kg · cast 2024
G2strike note
Maria
780 kg · cast 2023
D3strike note
The Watchman
1,410 kg · cast 2023
B2strike note
Annunciata
460 kg · cast 2022
F#3strike note
Dominik
295 kg · cast 2022
A3strike note
The Peal of Seven
1,050 kg · cast 2021
C3strike note
Inside the bell foundry
The foundry

Fire, bronze, and a good ear.

For over a century this foundry has cast and tuned bronze bells — for towers, carillons and private commissions. Everything is done under one roof: pattern, mould, melt, pour and tuning. We cast few bells a year, and we tune every one by ear.

Commission

Ring true.

Tell us the tower, the note, the weight — or just the occasion. We will write back with a drawing and a price.

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