. The Philosophical magazine; a journal of theoretical, experimental and applied physics . ^-. ?i<^,\i,arCvoifv D<ft,A TV^ ^^ 1 - CAr\ ai»-1 v~oui In, 284 Mr. A. A. Michelson ofi the Application of the surface of the plane parallel plate G^*. Here it divides,part being transmitted to the fixed plane mirror Mj and partreflected to the movable mirror M2. These mirrors returnthe light to the silvered surface, where the first part is re-flected and the second transmitted; so that both pencilscoincide on entering the observing-telescopef • A little consideration will show that this arr


. The Philosophical magazine; a journal of theoretical, experimental and applied physics . ^-. ?i<^,\i,arCvoifv D<ft,A TV^ ^^ 1 - CAr\ ai»-1 v~oui In, 284 Mr. A. A. Michelson ofi the Application of the surface of the plane parallel plate G^*. Here it divides,part being transmitted to the fixed plane mirror Mj and partreflected to the movable mirror M2. These mirrors returnthe light to the silvered surface, where the first part is re-flected and the second transmitted; so that both pencilscoincide on entering the observing-telescopef • A little consideration will show that this arrangement is,in all respects, equivalent to a film or plate of air betweentwo plane surfaces. The interference phenomena are, there-fore, the same as for such an air-plate. The theory of these interference-bands has been given inan article entitled Interference Phenomena in a new formof Refractometer, Philosophical Magazine for April is there shown, the projections of the bands are, in general,conic sections, the position of maximum distinctness beinggiven by the formula


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