they are instantly recognised and much loved thanks largely to the short stories by Neil Munro about Vital Spark and her captain Para Handy

and independently tested to the new Slip Resistant standard BS8445:2012

Measurements are: case diameter 6"

The wool used is museling-free and certified to the RWS

and covered in soft fawn-coloured suedette on top with navy covered twill beneath (to reduce glare on the eyes)

Radiometer TAPESADHESIVES they are instantly recognised andThese curious and mesmerising instruments measure the power of electromagnetic radiation. Made from a glass bulb with much of the air removed to form a partial vacuum, inside is a set of fine metal vanes, each with one dark and one light side, mounted on a spindle. The vanes rotate, as if by magic, when exposed to sunlight, artificial light, or infrared radiation (even the heat of a hand nearby can be enough) the more intense the light, the faster the