Glass blowing
Stained Glass Windows: Managing Environmental Deterioration, published by Historic England in 2020, suggests that glass blowing is a: ‘Glass-forming technique, probably developed in Babylonia and the Middle East by the 1st century BC. Molten glass is gathered into a ball on the end of a hollow pipe, and rolled on an iron former to roughly shape it and to slightly cool the surface. Then the pipe is used to blow air into the glass and form it into a bubble. By repeated blowing, shaping and reheating, the glass can be formed in many ways.’
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, defines a blowing iron as: ‘A long iron tube that was dipped into the molten glass to collect a gather for subsequent inflating and shaping.’
It defines optic blowing as a process in which: 'A gather of glass is blown into a mould with a pattern on the inner surface, which transfers to the glass. Continued free blowing results in movement and distortion of the pattern.'
And overblow as: 'A by-product of mould blowing, referring to the glass that remains outside the mould, which is removed and recycled.'
It defines paraison as: 'The partially inflated gather of glass at the end of the blowing iron.'
And paraison end as: 'A marble-shaped blob of glass pinched from the end of the gather during the blowing of particular forms, such as the bowls of goblets.'
[edit] Related articles on Designing Buildings Wiki
Featured articles and news
Soil moisture content, construction and landscaping
The effects, of low and high rainfall on soil and buidlings.
Sustainability or sentimentality in the refurbishment sector.
Has the pendulum now swung too far ?
Negative impacts of political instability on projects
Expected by 64% of the respondents in nationwide survey.
BSRIA Market Intelligence Reports
World Building Automation and Control Systems (BACS) 2022
Statement of health and early intervention.
The importance of regular check-ups
And related links on DB.
Sustainable urban drainage systems SUDS
Rooflights, skylights, roof windows and Part L
Shedding some light on the new Building Regulations.
Interview with historic built environment surveyor.
Upgraded membership category now requires assessment.
The average kinetic energy of molecules
Temperature in buildings, explained on DB
Women and unequal pay in project management
Main barrier to entering the profession, new study reveals.
IHBC’s response to Parliamentary Committee
On Levelling-Up and Regeneration Bill.
Finalists for 2022 CIOB Awards revealed
Over 70 managers and organisations shortlisted for the 14 awards.
Types of building sensors on BD
From biometric to electrical current, chemical and more.
Government mandates detectors in rented homes
Changes are due to come into force on 1st October 2022.
80% of major government projects are rated red or amber
Heed advice and insight of this report IPA tells the government.
The end of the games but continued calls for action
From the Commonwealth Association of Architects.
Sustainable urban drainage systems SUDS