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Pottery notes

Posts on pottery: materials, technique, kilns, glazes, and the physics behind the craft. Written to help potters get better work out of the studio.


Essay · Studio safety ·

The studio looks clean, and the air is not

Burns heal. Silicosis does not. What respirable silica is, where it comes from in an ordinary studio, why cleaning wet beats a thorough weekly sweep, and how to find out whether the respirator you already own is sealing.

Studio Read →

Essay · Pyrometry ·

The controller reads 1222 °C, and the cone disagrees

Temperature is instantaneous, heat work is cumulative, and only one of them decides whether your glaze melted. What a pyrometric cone measures, how heating rate moves the target, and how to catch a thermocouple that has started to lie to you.

Kilns Read →

Essay · Prospecting ·

Digging your own clay, and writing the data sheet yourself

Where clay hides, the five field tests that take a jar of water and a bottle of vinegar, and the one firing that decides everything else. Prospecting is the testing discipline you already owe your materials, applied to one that arrives unlabelled.

Raw materials Read →

Blog · Kiln construction ·

Designing a kiln brick by brick

How to use the kiln builder, and the masonry it models: running bond, sprung arches, catenaries, and round walls, with the counting that traces every brick back to the saw.

Kilns Read →

Blog · Electric kiln design ·

How the element calculator works

From Ohm's law to the Kanthal design procedure: wire diameter, hot resistance, coil geometry, and the surface load that decides how long a heating element lasts.

Kilns Read →

Blog · Electric kiln design ·

How the kiln energy calculator works

Inside the energy calculator: a coupled steady-state heat-loss solver, temperature-dependent conductivity, two ways to count a thick wall, and how loss becomes the power and fuel your kiln needs.

Kilns Read →

Essay · Electric kiln design ·

What 60 electric kilns tell you about power

A survey of 60 production electric kilns, the physics behind the kiln builder, and where Olsen's quick formulas land relative to what is on shop floors today.

Kilns Read →