SPARE PART: GLASS BALL

Worth to know

The goldsmith cup formerly served as a light source in the workshop and consists of a timber frame and a glass sphere. The glass globe is filled with water and placed behind a candle to focus diffuse light as a condenser lens and so illuminate the workplace. In this way, the low-light hours of the day to work could be used. As the water filled Schuster ball absorbs the heat generated by the light source, could also work with temperature-sensitive materials close to the light source.

Information on naming:
The workshops of Schuster, who belonged to the poorer craftsmen were often illuminated poorly with daylight, so this source of artificial light was just in these workshops required as indispensable tool. Also in the workshops of other professional groups held the "Schuster ball" before the introduction of electric light their collection.