… holder in which the substance to be analysed is placed, an observation eyepiece and a measuring scale. In … This group includes : spectroscopes for the observation of spectra; spectrographs for recording the … spectroheliographs and spectrohelioscopes, used for solar observation ( heading 90.05 ); spectrum projectors, for …
… Sauces are normally added to a food as it cooks or as it is served. Sauces provide flavour, moisture, and a contrast in … or fruit. These preparations differ from prepared or preserved vegetables and fruit of Chapter 20 in that they …
… to track rails to prevent derailments at crossings and curves. Rack rails are intended for steep gradient … cogged wheel. All the above rails may be straight, curved or drilled with bolt holes. (2) Switch blades, …
… of this heading has a second stage of magnification for the observation of an already magnified image of the object. A … of the object, and an eyepiece which further magnifies the observed image. The optical system usually also incorporates … for cinephotomicrography . In addition to the visual observation of the specimen, these also permit the …
