Photo-micrographyScientific Press, 1899 - 163 Seiten |
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achromatic adjustment amount angle aplanatic cone apochromatic apparatus arrangement auxiliary condenser bacteria blow-fly camera length centre close the iris coal gas collodion colour contrast correct cover-glass critical light Cylinders dark depth of focus diatom dots draw tube effect employed equally explained exposure eye-piece firm focussing ground glass Heurck HIGH HOLBORN high N. A. high-power HOLBORN hypo illumination immersion inch iris diaphragm isochromatic lens lenses lime limelight LOW-POWER PHOTO-MICROGRAPHY magnification medium microscope millimetres Nikko numerical aperture objective oblique light obtained optical axis optician ordinary oxygen paper perfect photographic lens picture piece placed Planar portion position Powell & Lealand proboscis produced rays realgar refractive index ROSS screen screws seen shown in Fig side sold solution specimen spherical aberration stained substage condenser sufficient taking the photograph thick vertical WATSON & SONS whilst Zeiss Planar
Beliebte Passagen
Seite 35 - As regards drying the final negative, we have had so much trouble caused by inequalities in the film, produced by irregularities in the drying, that some time ago we gave much attention to the subject, and seeing that now hardly any trouble in that direction arises, we venture to simply state how it may be avoided. The negative is placed glass side downwards on a cloth and a fine handkerchief is gently and neatly laid over the gelatine side.
Seite 35 - A ring of slightly melted gelatine will often be the result, which it is needless to say spoils the picture. This is especially the case when the negative is dried on a hot water tank.
Seite 151 - Multiples of the above may be found by multiplying the values given by the square of the multiplier.