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Articles by Charles Lewton-Brain

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[763] Notes on Asbestos and Jewelers

Asbestos is a real problem for jewelers. When I was first a student in 1974, we had a bucket of loose asbestos fibers under the soldering bench; we would take a handful and moisten it with water to form a clay-like blob to hold things together for soldering. This would be unthinkable today.... (2005)

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Show me more articles from: [The Jewelry Workshop Safety Report]|[Charles Lewton-Brain]

Releated Categories:[Health Hazard]

ISBN: 0969851049

[102] Notes on Gemstone Fluorescence

Fluorescence is the emission of visible light from a substance under the stimulation of radiation of a shorter wavelength. It may be stimulated by (visible) light but most useful are blue light, short wave ultra-violet (UV) light, long wave UV and x-rays. Daylight contains some ultraviolet light and some artificial light sources (i.e. photoflood lamps) put out a considerable amount of UV light. An example of the effects of such light is blue fluorescing diamonds. Diamonds which fluoresce blue in UV light may have a yellow tint to them in UV free white light which is cancelled by the blue fluorescence in (daylight) conditions.... (1994)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Gemology]

[57] Notes on Scoring and Bending

Scoring and bending is one of the most important ways of constructing jewellery. Scoring is a method of obtaining very sharply defined bends in metal sheets. The angle of the bend is determined mainly by the amount of material removed from the groove. It allows rapid and accurate work to specific angles.... (1994)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Fabrication]

[467] Notes on Soft Hammers

Jewelers spend hours fixing damage that they themselves did to the metal. Soft hammers and shaping tools limit the injuries to the metal being worked, with the best quality of all (the least damage to metal while still shaping it) being paper mallets. Leather however remains tried and true as material for making mallets from.... (2004)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Homemade Tools]|[Bench Tips & Tricks]

[103] Notes On Specific Gravity

Archimedes is said to have discovered that when a body is placed in water the volume of water displaced is equal to the volume of the body and that when the body is placed in water that it undergoes an apparent loss of weight. This loss of weight is equal to the weight of the water displaced. When a gem is weighed in air and then weighed in water the loss of weight is equal to.... (1994)

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Show me more articles from: [Brain Press Publications]|[Charles Lewton-Brain]

Releated Categories:[Gemology]

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