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KANTHALS

Alloys with high electrical resistivity, used as heating elements in furnaces. General composition iron 67%, chromium 25%, aluminium 5%, cobalt 3%.

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KAOLIN

The main constituents are kaolinite, a hydrated aluminium silicate, and illite, a mica-like aluminosilicate together with potassium, magnesium and iron. Basis of porcelain and bone china and used as a filler for paper, rubber and toothpaste. Also china clay.

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KAOLINITE

A finely crystalline form of hydrated aluminium silicate, 0H4Al2Si205, occurring as minute monoclinic flaky crystals with a perfect basal cleavage; resulting chiefly from the alteration of feldspars under con

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KAOLINIZATION

The process by which the feldspars in a rock such as granite are converted to kaolinite.

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KAPLAN WATER TURBINE

A propeller-type water turbine in which the pitch of the blades can be varied in accordance with the load, resulting in high efficiency over a large load- range.

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KAPOK

The seed hairs of the kapok tree, Ceiba pentranda. They are light and fluffy and in loose form are used as an insulating or flotation material eg in life jackets. They are not spun or converted into fabrics commercially.

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KAPOSI'S SARCOMA

A malignant vascular skin tumour that appears in two forms. The first is a slowly progressive lesion on toes or legs of elderly men of Mediterranean origin. The second is a much more invasive disseminated form and is common in children and young men in Central Africa. It is now seen as a common feature in AIDS. See panel on Acquired immunodeficiency syndrome AIDS,

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KAPP PHASE ADVANCER, KAPP VIBRATOR

A form of phase advancer for use with slip-ring induction motors. It consists of a small armature connected to each phase of the rotor circuit and allowed to oscillate freely in a dc field so that it has a leading emf induced in it.

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KAPPA CHAIN

One of the two types of light chain of immunoglobulins, the other being the lambda chain. An individual immunoglobulin molecule bears either two kappa or two lambda chains. The proportion of molecules bearing each chain varies in different species. In humans about 60% are of the kappa and 40% of the lambda type,

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KAPPA NUMBER

A bleachability test for pulps measured by the number of ml of 01N potassium permanganate solution consumed by 1 g of dry pulp,

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