. The Bell System technical journal . rfaces at high powers has beenworked out in our laborator>- so that it is now possible to study metalstructures with great clearness at high powers. E(|uipment forgrinding and polishing specimens is shown in Fig. 14. Metals, after polishing, as a rule, do not show their structuralcharacteristics, but must be treated in some way to etch the polishedsurface. This etching of>eration is a simple matter for low-powerwork, but as the magnification is carried higher and higher, theproblem becomes increasingly difficult. 116 BELL SYSTEM TECHNICAL JOURNAL Bei
. The Bell System technical journal . rfaces at high powers has beenworked out in our laborator>- so that it is now possible to study metalstructures with great clearness at high powers. E(|uipment forgrinding and polishing specimens is shown in Fig. 14. Metals, after polishing, as a rule, do not show their structuralcharacteristics, but must be treated in some way to etch the polishedsurface. This etching of>eration is a simple matter for low-powerwork, but as the magnification is carried higher and higher, theproblem becomes increasingly difficult. 116 BELL SYSTEM TECHNICAL JOURNAL System Photomicrographic Laboratory A general view of the Laboratory situated on the fifth floor of thebuilding at 463 West Street, New York City, is shown in Fig. of the equipment is more fully illustrated in detail views. It consists of two metallurgical equipments, one of which is thelarge Zeiss metallographic outfit shown in the foreground of Fig. equipment is of precision quality and is used for all classes of. Fig. 16—The Martens stand of the large metallographic outfit. The vertical illum-inator is shown between the barrel of the microscope and the objective. work involving opaque specimens. The optical parts consist of afull complement of apochromatic objectives and compensatingeyepieces for medium and high-power work. For low-power worka full set of Zeiss micro-planar lenses and a Tessar lens are maximum bellows extension of the camera is 155 centimetersand the plate holders are designed for 24 x 30 centimeter plates andall smaller sizes by employing suitable kits. The illuminating trainconsists of an automatic arc lamp, a condensing system, and coolingcells, mounted on an optical bench and capable of adjustment tomeet the conditions of the work. Illuminators of conventional t>pes, for vertical and oblique lightmay be assembled on the Martens t>pe stand. This stand is adeparture from the construction of the usual form of micro
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Keywords: ., bookcentury1900, bookdecade1920, booksubjecttechnology, bookyear1
