Recently, when surfing the internet, I came across some correspondence between a cat lover and a supplier of cat food. When the cat lover wished to order cat food the supplier’s web site required that he enter the cat’s weight in kilograms. However, he wished to enter the cat’s weight in pounds. He went on to say that he had measured his cat’s weight by first weighing himself (13 st 4 lbs, or 186 lbs) and then weighing himself while holding his cat. The rest of the article was devoted to correspondence between himself and the cat food company in which he voiced his preference for using pounds.
Continue reading “Why can I not record my cat’s weight as five pounds?”Author: Martin Vlietstra
Do British road signs display symbols or abbreviations?
According to the Concise Oxford Dictionary, an abbreviation is defined as a “shortened form of a word in which part of the word is written” [rather than the whole word] while a symbol is defined as a “Mark or character taken as the conventional sign of some object or idea or process”. As a result, abbreviations are language-sensitive whereas symbols can be consistent across linguistic boundaries.
Continue reading “Do British road signs display symbols or abbreviations?”Report on Measure for Measure Conference
Martin Vlietstra attended the St Cross Centre for the History and Philosophy of Physics (HAPP) one-day conference in Oxford on Saturday 7 June 2025 and has written a report about the conference for Metric Views.
Continue reading “Report on Measure for Measure Conference”NHS to Fight Obesity
On 18 March, the Times reported that NICE (National Institute for Health and Care Excellence) had opened a consultation on an updated version of their general guidance document in which it proposed that millions should have an annual weigh-in to fight obesity. These weigh-ins would take place at doctor’s surgeries and will be aimed at those who have certain conditions including diabetes, arthritis and heart failure. The consultation runs until 15 April 2025. [Ref 1, 2, 3]
Continue reading “NHS to Fight Obesity”Speedometers and Metrication
How are speedometers designed to accommodate the change from mph to km/h? In this article I will examine a variety of techniques and at the end of the article I will propose a 21st Century solution.
Continue reading “Speedometers and Metrication”Is that really one kilogram?
When a retailer weighs out his product in front of the customer, can the customer trust the scales? It is usually up to local government to certify the accuracy of such scales, though in recent years, certification of measuring devices within much of the world has been privatised with various countries’ national laboratories overseeing the certification process.
Continue reading “Is that really one kilogram?”Early Metrication on Southern African Railways
During the last decade of the nineteenth century, events in Southern Africa were dominated by the gold rush as adventurers scrambled to exploit the newly discovered in the Johannesburg area. This and the egos of and animosity between the financier and Cape Colony prime minister Cecil John Rhodes and the aging and dour president of the Transvaal Republic Paul Kruger resulted in the Anglo-Boer War of 1899-1902.
Continue reading “Early Metrication on Southern African Railways”Driverless Cars
The on-going development of driverless cars is seldom out of the headlines. There are questions about the reliability of the software which will drive the cars and who will be liable should there be an accident.
Continue reading “Driverless Cars”International Vocabulary of Metrology
International Vocabulary of Metrology (VIM) is a “System of Units”, not a “System of Measurement”. The VIM explains the terminology used in publications related to measurement, including the official SI brochure.
Continue reading “International Vocabulary of Metrology”International Organisation for Legal Metrology
The International Organisation for Legal Metrology (OIML from the French “Organisation Internationale de Métrologie Légale”) is housed in a non-descript office in the Rue Turgot in the 9th arrondissement of Paris and is about 700 metres the from the Gare du Nord. Like the BIPM, the OIML is an inter-governmental organisation which gives its staff quasi-diplomatic status, though, like the BIPM, French nationals pay French income tax. The OIML works closely with BIPM, the International Standards Organization (ISO) and other international bodies in coordinating metrology around the globe, with each organisation having its own specific role.
Continue reading “International Organisation for Legal Metrology”
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