Personne

Jean-François Loude

Publications associées (14)

The Diffusion Hygrometer: A commercial failure

Louis Dufour (1832-1892), professor at the Academy of Lausanne (Switzerland), had observed in 1874 a pressure difference across a porous wall separating moist air and a vessel containing either water or a desiccant, pointing to the possibility to use this ...

2020

Laboratory electromagnets: from the beginnings to Electromagnet Laboratories

Jean-François Loude

The mechanical action on iron of the first horseshoe electro-magnets (1824) was obvious. Their use to investigate more subtle magnetic, magneto-optical, atomic or nuclear properties of matter began in 1845 with Faraday. Until the first iron-less Bitter mag ...

2019

Musée de physique de l’Université de Lausanne

Jean-François Loude

Le Musée de physique de l'Université de Lausanne: – Bref historique de l'Académie de Lausanne – Présentation du Musée – Quelques instruments remarquables ...

2018

Musée de physique de l'Université de Lausanne

Jean-François Loude

Brève histoire de la physique à Lausanne, présentation du Musée de physique de l?université de Lausanne ainsi que de quelques instruments remarquables ...

2018

The Diffusion Hygrometer: A late invention of H. Greinacher

Jean-François Loude

The diffusion of gases, dry and moist, had been studied in 1874 by Louis Dufour, who observed a pressure difference across a porous wall separating moist air and a vessel containing either water or a desiccant. 70 years later, Heinrich Greinacher (1880-197 ...

2017

Force and Work Measurements: The Beginnings

Jean-François Loude

The first practical, portable “dynamometer”, designed in 1798 by Regnier, was used to quantify the muscular strength of men and animals. It was promptly used by ethnologists to test the strength of the “savages”. A smaller improved model (Collin dynamomete ...

2014

Early Dynamometers (from Muscle to Steam Power)

Jean-François Loude

Spring balances, based on Hooke’s law, have been used for weighing since the early 18th century. At the end of the century, naturalists such as Buffon felt the need to quantify the muscular force of men (humans) and animals. The first practical, portable “ ...

2014

Physics in magnetic fields from Michael Faraday to Pierre Weiss & his contemporaries

Jean-François Loude

The mechanical action on iron of the first horseshoe electro-magnets (1824) was obvious. They quickly found important applications (telegraphy). Their use to investigate more subtle magnetic, magneto-optical, atomic or nuclear properties of matter began in ...

2013

Gottfried Erich Rosenthal (1745-1813), a follower of Deluc in northern Germany

Jean-François Loude

Gottfried Erich Rosenthal (1745-1813) was born and died at Nordhausen (now in Thuringia). As his ancestors, he became a Master-Baker after his studies at the local Gymnasium, where he excelled in mathematics. In 1779, after reading the 1772 treatise by Del ...

2013

A key to success for an instrument maker: Collaboration with a scientist The case of Haag-Streit (established 1858) and Heinrich Wild (1833-1902)

Jean-François Loude

The firm known today as Haag-Streit was established in 1858 at Bern by F. Hermann and H. Studer, the latter being succeeded in 1865 by J. H. Pfister, to make precision scientific instruments. In the same year, H. Wild became professor of physics at the Uni ...

2012

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