Metallurgical Photomicrographic Apparatus

Abstract

IT is, of course, well known that for satisfactory work in any branch of microscopy, excellence of the optical parts of the apparatus is a prime essential. In the article referred to, however, it was intended, as was suggested near the beginning of the article, to discuss only the mechanical construction of the various instruments. Any detailed reference to the method of illumination, which is undoubtedly an item of considerable importance in metallurgical microscopy, was also thereby excluded. When referring to items to which the user might attach importance because they suited his particular method of working. the writer had in mind the various methods of illumination employed, including the universal vertical illuminator fitted to the Beck instrument, which permits of the use of various types of transparent and of opaque refleetor which are easily interchangeable and easily adjustable in every required direction. Reference was also made in the article to the wide range of adjustment of the elements of the illuminating system provided by the British instruments. These adjustments facilitate the use of the methods of illumination mentioned by Mr. Beck; but, as was suggested, the method of obtaining the adjustments might be improved.