Tag Archives: historic photos

Forvitring av kleberstein på middelalderkirker – to videoer

Sist vinter holdt jeg to foredrag om forvitring av kleberstein sett i lys av bygnings- og restaureringshistorie. Det dreide seg om portaler fra norsk middelalder og foredragene ble holdt på «Portalseminaret» i regi av «Domkirken 2025»; miljøet som nå restaurerer Stavanger domkirke og som jeg også er en liten del av. Alle foredragene fra seminaret (og mange andre interessante saker om restaureringen) er nå lagt ut på YouTube.

Kanskje kan mine to foredrag være til hjelp for folk som sliter med å forstå hvorfor kleberstein forvitrer. Veldig mye dreier seg om hva bygningene har vært utsatt for av forandringer og restaureringer gjennom tidene. Men noe av forvitringen kan også knyttes til steinkvalitet, tidligere luftforurensning og ikke minst vann! Rett og slett lekkasjer! Innholdet i foredragene er i stor grad basert på min gamle doktoravhandling “The Stones of Nidaros” fra 1997 og mange artikler om forvitringshistorie, bl.a. “Weathering of soapstone in a historical perspective”. Continue reading

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St. Basil’s Cathedral in Moscow – on a cold winter day 25 years ago

I’m getting thousands of my old slides scanned at the moment. Since I’m not doing it myself, I reckoned that the “post-production” and archiving would cost me a few hours’, perhaps a day’s work. I was utterly wrong.

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Standing at the edge of the abyss: The castle ruin at Cartatscha in Graubünden (Switzerland)

Working as a conservation scientist I care for cultural heritage. My “problem” is that I’m also interested in the history of decay, including catastrophic events; just these phenomena that turn old masonry to rubble. But I’ve never seen it “live” … Continue reading

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Cleopatra’s Needle: Egyptian concern about the NYC obelisk

A few days ago Secretary General Zahi Hawass of the Egyptian Supreme Council of Antiquities expressed grave concern about the condition of Cleopatra’s Needle of NYC and even threatened to take the obelisk back to Egypt if care is not … Continue reading

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A Mauerzahn at Grünenfels castle ruin (CH): Surviving 2011?

Switzerland has a wealth of medieval castle ruins. In the Canton of Graübunden they are particularly numerous with, for example, the valley of Vorderrheintal (Surselva) displaying no less than about 50 ruins. Some are almost gone, others are kept in … Continue reading

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Cleopatra’s Needle: Tracing obelisk weathering with old photos

Historic photos are essential for research on monument weathering. With free internet access to archives, such photos are now easier to find than previously. Below, I will show the case of Cleopatra’s Needle, a famous Ancient Egyptian obelisk transferred to … Continue reading

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Stone weathering at the westernmost coast of Norway

As probably one of only very few monuments globally, the ruined Selja medieval abbey off the westernmost coast of Norway is built from a metamorphic olivine stone (dunite) rich in talc. The combination of a hard olivine matrix and soft … Continue reading

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