Show About Looking Glasses I The annual manufacture in Europe at the present time according to the latest statistics is something like 1850000 square yards of looking glass In the mirrors of today the light is reflected re-flected by a layer of silver or an amalgam of tin but a portion of light is lost in the process of reflection and the image is less luminous than the original The value of a looking glass is usually estimated by the thickness of the glass because the thicker they are the stronger they must bei but speaking scientifically thick glasses are defective because the outlines of the image reflected are less clearly defined de-fined There are really three reflections and consequently three images in every glass mirror one from the upper surface of the glass the second from the lower surface und the third from the metallic laysr at the back An ideal mirror is one with a perfectly flat surface but it is only possible to obtain ob-tain this result in comparatively small glasses The larger glasses do not reflect re-flect a true image because it is not possible pos-sible to make them quite flat |