By Ian Walker. United Kingdom.
Following on from the article on using the JNOEC XPT-7 polarizing microscope I have assembled the following image gallery.
All the images were taken on the Nikon Coolpix
4500 digicam plus an old Baker 5x uncoated eyepiece, [the JNOEC 5x eyepiece
a cross-hairs disc which is not easily removed], objective details from the JNOEC package are given with the images.
Crossed-Polars : the surreal world of cholesterol
acetate, taken in black and white, objectives : left and centre 4x NA 0.1
and on the right 10x NA 0.25, a Biosil slide.
Brightfield : on the left, two Aulacodiscus
margaritaceus diatoms from Peru mounted by A. C. Cole using the 10x
on the right an Arachnoidiscus, from a slide of five arranged diatoms by H. R. S. Williams mounted in 1922, 25x NA 0.4 objective.
Crossed-Polars : on the left, honey bee third
leg 10x objective, on the right the same image using the 4x objective,
a Brunel Microscopes slide.
Crossed-Polars: resorcinol crystals, 4x objective from a slide prepared by the late Eric Marson NBS ref 115.
Crossed-Polars: fibres of viscose silk, 4x objective, slide prepared by Biosil.
Crossed-Polars : leaf scale from Eleagnus glabra, slide prepared by Biosil.
Crossed-Polars : on the left a robin feather
taken with the 10x objective and on the right part of the radula
[rasping structure] in the mouth of a pond snail using the 4x objective, both slides prepared by Biosil.
Crossed-Polars : santonin crystals, an old slide from NBS ref k20, 4x objective.
Crossed-Polars : urea crystals, 4x objective, from a slide prepared by the late Eric Marson NBS ref 116.
Crossed-Polars plus full lambda waveplate:
looking like a gemstone, a crystal of ascorbic acid glows in an eerie light,
slide prepared by Mike Samworth 1997.
Crossed-Polars plus full lambda waveplate: Foraminifera from Swanage Bay, 4x objective, slide prepared by Brian Darnton.
Brightfield: two Aulacodiscus comberi diatoms from Peru by an unknown mounter [possibly H. R. S. Williams], 25x NA 0.4 objective, here the lower NA and greater working distance gives better depth of field giving an almost 3D effect compared to previously used Zeiss optics.
Crossed-Polars: like something from the deep
oceans it is in fact part of the radula from a land snail, 4x objective,
slide prepared by Biosil.
Comments to the author, Ian Walker, are welcomed.
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Published in the June 2003 edition of Micscape Magazine.
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