Date of Birth: 02/15/1861
Place of birth: Fleurier
After a year of service in the Swiss Army as an artillery officer, he joined as an assistant in the shortly before established the International Bureau of Weights and Measures in Sevres, near Paris. In 1902 he became deputy director and in 1905 director of the Bureau, and remained in that post until his retirement (1936), after which he received the title of Honorary Director.
The first work made at the International Bureau, was associated with a precision mercury thermometer. In this device, a relatively large amount of mercury contained in a glass spray can, to which is attached a long cylindrical glass tube of small diameter. With increasing temperature increases the volume of mercury that causes an appreciable change in the position of the upper end of a column of mercury. To improve the accuracy of measurement is necessary to introduce amendments spray volume change associated with the thermal expansion or contraction of the glass, to change the cross sectional area and length of a column of mercury, and then make the appropriate calibrated thermometer. Speed ??and volume changes in the length depends on the temperature. The results of calculations made by him all amendments G.izlozhil in "Treatise on thermometry