A block, typically made of wood, is used
to shape and cool the surface of the glass further. The glassblower rolls the hot glass on the
block to achieve the desired form and texture.
Process: The
glassblower rolls the hot glass on the block, which can have a specific
profile, to shape the glass into the desired form.
Use: Blocking is particularly
helpful for creating complex shapes and contours in the glass, including
creating the fundamental form of the glass object.
Observations: During blowing, glassblowers should pay close
attention to the expansion of the glass. They must monitor the pressure applied
to the blowpipe and the area of glass in contact with the block to achieve the desired thickness and shape. It's essential to
avoid over-inflating the glass, which can cause it to thin out too much.
Cognitive
Process: When
blocking, the glassblower visualises the final form and decides how the wooden
block will aid in achieving it. They must make quick judgments about pressure,
speed, and the orientation of the glass.
Safety Considerations:
-
Be mindful of splinters from
the wooden block, and inspect the block for wear and damage.
- Check that there are no cracks on the side of the handle that could create a jet of burning steam.
Perceptual stimuli:
- Visual Perception: Glassblowers visualise the
final form and how the wooden block will help achieve it. They monitor the
glass's interaction with the block.
- Tactile Perception: The glassblower feels the
pressure and feedback when rolling the glass on the wooden block.