Mollier h-x diagram · calculator

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The Mollier h-x diagram shows the state of moist air: temperature, humidity, moisture content and enthalpy in one chart. This interactive calculator places up to six air states on the diagram from their temperature and relative humidity, and works out the dew point, wet-bulb temperature, moisture content, vapour pressure, enthalpy and air density, each at … Read more

Lars Fr. H. Svendsen: Stupidity, Idiocy and Stupid Idiots

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Genre: Non-Fiction Category: Philosophy Publisher: Kagge Forlag Year: 2024 Pages: 142 ISBN: 9788248936688The Hungarian edition was published by Figura Könyvkiadó in September 2026. It runs to 132 pages and is priced at HUF 5,199. It has become a cliché to say that we live in a post-truth age, when facts are reduced to matters of … Read more

Margaret Hamilton, 1936–2026: The Engineer Who Planned for the Mistake

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Margaret Hamilton, who led the MIT team that wrote the onboard flight software for the Apollo spacecraft, died on September 30. She was 90. Most obituaries will reach for the same scene: On July 20, 1969, with the lunar module Eagle still roughly six miles above the Moon, the guidance computer flashed a code nobody … Read more

Two Passes, One Document: Collating a Flipped Scan with pdftk

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Scanning a double-sided document on a simplex scanner leaves you with two PDFs: the fronts in order, the backs in reverse. Interleaving them is one pdftk command with a backwards page range, and that part has never been the difficult bit. This piece works through the page-index arithmetic, a ten-minute test that proves the merge … Read more

From Censor to Atlas

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Secret military installations have always attracted rumours and speculation, although even people living nearby rarely knew much about them for certain. Today, with the internet and satellite imagery available through services such as Google Earth, keeping such facilities hidden has become considerably more difficult. Genuinely sensitive installations may still remain shrouded in secrecy, but the … Read more

Silvercrest 9149 Energy Consumption and Cost Meter

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The latest victim on the Teardown Bench is a budget Lidl plug-in power meter. It was sacrificed because its plastic parts had literally begun to crumble away. There is nothing particularly remarkable inside, but the subject of electrical power measurement itself is well worth a closer look! The Silvercrest 9149 energy monitor (also sold as … Read more

In Search of Garnets in the Börzsöny Mountains

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For most of us, the Börzsöny Mountains bring to mind andesite, old mines and volcanic landforms. Yet one of the range’s most distinctive minerals is a genuine gemstone: almandine, the iron-rich member of the garnet group. Most Börzsöny specimens would hardly belong in a jeweller’s window, but they are all the more interesting geologically. These … Read more