Sunday, August 31, 2008
Saturday, August 30, 2008
little children
i was taking pictures of the japanese dolls and the flowers through the bow window of a restaurant when i saw the kids hiding while looking at what i was doing, then laughing. i went away when i heard their mother shouting at them.
Friday, August 29, 2008
Thursday, August 28, 2008
Wednesday, August 27, 2008
Tuesday, August 26, 2008
Monday, August 25, 2008
Sunday, August 24, 2008
Saturday, August 23, 2008
Friday, August 22, 2008
Thursday, August 21, 2008
the geissler tubes
i saw these mysterious tubes through the bow window of an antique shop that sells chemistry equipment.
The Geissler tube is a glass tube for demonstrating the principles of electrical glow discharge. The tube was invented by the German physicist and glassblower Heinrich Geissler in 1857. The Geissler tube was an evacuated glass cylinder with an electrode at each end. Geissler tubes contain a combination of one of the following: rarefied (thinned) gasses such as neon, argon, or air, or conductive liquids or minerals. When a high voltage is applied to the terminals an electrical current flows through the tube. The current will disassociate electrons from the gas molecules, creating ions and when electrons recombine with the ions different lighting effects are created. The light will be characteristic of the material contained within the tube and will be composed of one or more narrow spectral lines.
Heinrich GEISSLER (1815 – 1879), dont le père était souffleur de verre et fabricant de thermomètres et baromètres, réalisait vers 1850 des tubes dans lesquels il étudiait la décharge dans différents gaz à différentes pressions.
Suivant la forme du tube et la nature du gaz enfermé, l'effet visuel était très différent et les effluves électriques pouvaient être d'une extrême beauté.
Tout ceci donnait lieu à des expériences très prisées d'un public attiré par les curiosités scientifiques, mais la compréhension des phénomènes physiques restait à apporter.
On s'interrogeait sur ces rayons électriques : était-ce des corpuscules, comme le pensait l'École anglaise, fidèle à Newton, ou bien des ondes, comme les ondes électromagnétiques, ainsi que le soutenait l'École allemande, marquée par la pensée de Hertz ?
Wednesday, August 20, 2008
Tuesday, August 19, 2008
my left foot
last saturday i bought new shoes and left them in their box until yesterday.
what a surprise when i tried to put them on !!! the guy at the store gave me 2 left feet !!!