Crown glass
Historic England 2020 Stained Glass Windows: Managing Environmental Deterioration, Swindon, published by Historic England in 2020 defines crown glass, or spun glass as a: “Method of producing sheet glass by hand. A bubble of molten glass is transferred onto a solid metal ‘punty rod’, or ‘pontil rod’, which can be spun between the hands of the glass blower. The blowing pipe is then cut away, and the molten glass spun using the punty rod until it suddenly opens out into a disc, or ‘table’. The earliest known crown glass in England dates from the 1440s; it was widely used for windows until the mid-19th century, when taxation by weight ceased and cylinder glass became cheaper.”
Archaeological Evidence for Glassworking, Guidelines for Recovering, Analysing and Interpreting Evidence, published by Historic England in 2018, defines a pontil scar as: 'The circular protrusion of glass left on a glass object after removal of the pontil iron, although it was ground away on finer vessels.'
[edit] Related articles on Designing Buildings Wiki
IHBC NewsBlog
Mapping tool for unused construction materials launched
A mapping tool that provides contractors and their suppliers with a central database of local Materials Exchange Platform (MEP) projects to help cut waste by finding a home for unused materials has been launched.
'Unusual' WW2 sites listed and upgraded to mark 80th anniversary of Battle of Britain
An air raid shelter, a pillbox cleverly disguised as a roofless cottage, a rare Chain Home radar defence tower, and a war memorial have been granted protection.
Derby City Council plans to knock down the 43-year old Assembly Rooms
A planning application has been submitted by Derby City Council to knock down the Assembly Rooms – which has played host to the likes of Elton John, Iron Maiden, Take That, etc.
RIBA launches new contracts for the provision of conservation architectural services
Specifically tailored for conservation projects, the Royal Institute of British Architects (RIBA) has launched two brand new professional services contracts.
Liverpool Mayor blocks £5m zip wire plan
Liverpool Mayor Joe Anderson has made a dramatic intervention into the zip wire row which has divided people, politicians and businesses in the city.
Big Ben’s roof is revealed as conservation work continues
The roof of the Elizabeth Tower (also known as Big Ben) is slowly becoming visible again from 28 September 2020, as part of the scaffolding is removed.
Discover webinars, lectures, training, and other events via IHBC's CPD Circular
The IHBC lists quality providers of education and learning in the historic built environment, and emails a monthly recap of their upcoming events.
Denmark’s 300-year-old homes of the future
On Læsø, houses are thatched with thick, heavy bundles of silvery seaweed that have the potential to be a contemporary building material around the world.
Upcoming Heritage Open Days to feature in-person and online events
For the first time in its history, England’s largest festival of heritage and culture will feature online events as well as in-person activities. Heritage Open Days (HODs) returns in September, thanks to support from players of People’s Postcode Lottery.
RSA report ‘Heritage for inclusive growth’ published
The Royal Society for the encouragement of Arts, Manufactures and Commerce (RSA) shows the scale of the ‘missed opportunity’ if we continue to separate heritage policymaking and economic policymaking.