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Orton Pyrometric Cones
Cone numbers originally started at 1 and went to 20. Each higher cone number requires more heat (a higher temperature) to bend. As demand for cones grew, both lower and higher cones were developed. A zero was added in front of the number for cones maturing at lower temperatures, below the original cone 1. Thus cone 01 needs less heat than cone 1, and cone 020 needs less than cone 019. It is important not to mix up the lower maturing cones, whose numbers begin with zero, with the higher maturing cones.
Cone 6 and cone 06 are not the same thing!
using cones in the Dawson Kiln-Sitter to control your kiln, place
the cone for your desired target temperature between the claws of the cone
holder inside your kiln. When the cone melts, the sensing rod will trip the
plunger to shut off the kiln's power.
Orton bars were specially designed to function in the Dawson Kiln-Sitter. They yield the same result as Junior Cones centered in the Kiln Sitter. The uniform shape makes consistent placement easy without affecting the firing. Click the down arrow for more temperature options. In boxes of 50. Cones are net-priced: no discounts apply.
The original Ortonmetric cones. Widely used as witness cones on kiln shelves to visually monitor firing progress and heatwork throughout the kiln. Large cones need to be supported by a cone plaque, a clay pat or a wire cone holder. Uniform mounting height and angle are very important. Click the down arrow for more temperature options. In boxes of 50. Cones are net-priced: no discounts apply.
Small "Junior" Cones are commonly used in the Dawson Kiln-Sitter. The tapered shape allows some flexibility in adjusting the shutoff point by placing the thinner or thicker portion of the cone under the sensing rod. Junior Cones can also be used on the kiln shelf as mini witness cones when space is limited. Junior Cones deform at slightly higher temperatures than Self-Supporting or Large cones rated for the same temperature. Click the down arrow for more temperature options. In boxes of 50. Cones are net-priced: no discounts apply.
Self-supporting "witness" cones are the most accurate and easiest to use cones available. Cone holders or plaques are not needed. Many glaze and kiln manufacturers recommend use of witness cones to achieve best firing results. Click the down arrow for more temperature options. In boxes of 25. Cones are net-priced: no discounts apply.