Fundamental glassblowing techniques
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Gathering is the initial step in glassblowing. It involves heating a blowpipe or punty (a solid metal rod) and dipping it into the furnace to gather molten glass. The glassblower then rolls the gathered glass on a marver (a steel table) to shape and cool it.
Process: The gathering process begins with heating the end of the blowpipe or punty in the pipe warmer (in some workshops on the sill of the furnace) until it reaches around 500 °C (930 °F), so that the blowpipe does not melt. The glassblower carefully dips the heated end of the rod into the furnace, allowing the molten glass to adhere to it. The glassblower rotates the rod while removing it to create a symmetrical gather.
Use: Gathering is the foundation of most glassblowing projects. The initial gather forms the core of the glass object and can be built upon with subsequent gathers to achieve the desired size and volume.
Observations: While gathering, glassblowers should observe the thickness and viscosity of the molten glass. The glass should adhere evenly to the blowpipe or punty. Proper temperature control is crucial to ensure a smooth gathering without dripping or irregularities.
Cognitive Process: During the gathering phase, the glassblower is focused on the selection of the right amount of molten glass and monitoring its viscosity. This requires an understanding of the glass's behaviour at different temperatures.
Safety Considerations:
- Wear appropriate protective gear, including heat-resistant clothing (avoid synthetic clothing), safety glasses, and safety closed-toe shoes.
- Beware of radiant heat from the furnace and avoid accidental contact with hot surfaces.
Perceptual stimuli:
- Visual Perception: Glassblowers observe the colour and texture of the gathered glass, which provides cues about its temperature and consistency. They observe the glass on the axis.
- Tactile Perception: They feel the heat radiating from the molten glass, and they must handle the blowpipe or punty with care to prevent burns. They assess the weight to keep the rod balanced and the glass in line.
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