Seger Kegel; Seger cone

Japanese: ゼーゲルコーン（英語表記）Seger Kegel; Seger cone

This is a high-temperature measuring tool invented by German H. Segel in 1886, but it cannot be considered a gauge because it is disposable. Pure alumina is mixed with various compounds (silica sand, lime, soda, boric acid, iron oxide, lead oxide, etc.) and formed into a slightly inclined triangular pyramid (cone) usually 5 to 7 cm high. There are 59 grades with prescribed compositions in 20 to 30 degree increments from softening temperature 590 to 2000 degrees Celsius, and they are numbered from SK022 to SK42 (SK is the initial letter of the German word). Examples of softening points are SK1 = 1100 degrees Celsius, SK10 = 1300 degrees Celsius, SK20 = 1530 degrees Celsius, SK30 = 1670 degrees Celsius, SK40 = 1920 degrees Celsius, etc. Several cones with softening temperatures near the desired temperature are set up in a furnace, and the temperature is determined by the number of the one that has softened until its top touches the base. It is often used in the ceramics industry to determine the effectiveness of the firing process in the furnace rather than to measure the temperature accurately.

Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information

Japanese:

ドイツの H.ゼーゲルが 1886年に考案した高温測定用具であるが，使い捨てなので計器とはいえない。純アルミナに種々の配合物 (ケイ砂，石灰，ソーダ，ホウ酸，酸化鉄，酸化鉛など) を加え，通常は高さ5～7cmのわずかに傾いた三角錐体 (コーン) につくる。軟化温度 590℃から 2000℃まで，20～30℃きざみに調合が規定された 59等級があり，SK022から SK42までの番号がついている (SKはドイツ語の頭文字) 。軟化点の例を示すと，SK1＝1100℃，SK10＝1300℃，SK20＝1530℃，SK30＝1670℃，SK40＝1920℃などである。目的温度付近の軟化温度をもつ数本のコーンを炉内に立て，頂部が台につくまで軟化したものの番号で温度を知る。正確な温度測定というより，炉内の焼成の効果の程度を知るのが目的で，窯業でよく使われる。

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