3D graphing of mathematical functions

[Michael GilliganParticipant @michaelgilligan61133]

Dave,

Klaus Kemp still arranges diatoms, to Victorian standards.

**LINK**

http://www.diatoms.co.uk/

MichaelG.

.

Also see Stephano Barone : http://www.diatomlab.com/diatom-shop.html

… and if you are hooked, have a look at these [clickable images]

http://www.mikrohamburg.de/HomeStereo_E.html

Edited By Michael Gilligan on 23/12/2016 22:11:14

[SillyOldDufferModerator @sillyoldduffer]

Amazing work being done by Klaus Kemp, and Diatoms as art must be popular – it's a business!

His website led me to a coincidence. Are you the same Michael responsible for this letter in "The Amateur Diatomist"? Having strange interests I tried to read the paper but the link is broken.

Cheers,

Dave

13th October 2014

Re: Diatom Cleaning by Incineration

Following the very interesting and successful demonstration, at Pool-in-Wharfedale on Saturday; I thought this paper might be of interest.
Experimental studies on diagnosis of death from drowning by means of detection of vegetative planktons (diatoms) II. Detection of diatoms from putrefied and cremated bones of drowned bodies.

Best Wishes

Michael Gilligan

13th October 2014

[Michael GilliganParticipant @michaelgilligan61133]

Dave,

Indeed, I am that man

Sorry about the link … I may have downloaded the paper at the time.

If I can find it, I will send you a P.M.

MichaelG.

.

Better than that … Try Here: http://ousar.lib.okayama-u.ac.jp/en/search?all=diatom+cremated

Edited By Michael Gilligan on 23/12/2016 22:41:23

[SillyOldDufferModerator @sillyoldduffer]

Many thanks for providing a working link Michael. It made unusual reading over breakfast this morning!

I've been interested in microscopy in a small way for many years and am semi-prepared to do more now I'm retired. In practice, I've not had the time.

Before retiring, I looked at pollen and pond water in a haphazard way. I have a set of Pathology slides (as used to train pre-digital doctors), that could be studied for years. The only thing I've done with any semblance of method was a classic 'Hay Infusion' study. Notes and drawings every day for a month, took the Notebook to work to show a friend, and lost it!

Off to the Christmas whirl now. Roll on normality.

Cheers,

Dave

[AjohnwParticipant @ajohnw51620]

Interesting I came across the use of diatoms to determine drowning some time ago in a book on pathology.

For cleaning I use what is the fairly safe oxidiser approach. Sulphuric acid, potassium permanganate and a fully saturate solution of oxalic acid. It's an interesting example of what I call the web effect. Some people still use a whole series of boiling acids. That is needed when the source is diatom deposits. I didn't fancy it despite advice from some rather well known people. I came across the method in a book that is intended for late teenagers attending study centres such as Dale Fort. Wanting more info just in case I spent a lot of time searching for it. Nothing at all. Mentioned it on a forum and a few months later it was all over the place. Later still some one found a paper. A rather misleading one from what I can gather.

Some people use bleach. Ok but it can dissolve the lot.

Klaus did sell prepared slides on ebay and probably still does. Bidding is often fierce for them. There is also a person in France that did crop up on there as well who does excellent slides. Each diatom has to be placed individually in order to get a decent slide. The usual strews can be very disappointing. In the right mountant lots of them are things of beauty. Others are a resolution challenge – best not get too far into that area. It can lead to a vast increase in gear.

John

–

Edited By Ajohnw on 24/12/2016 10:35:41

[Michael GilliganParticipant @michaelgilligan61133]

Posted by Michael Gilligan on 22/12/2016 23:04:12:

I think I may have found my introductory text: **LINK**

http://mathinsight.org/interactive_gallery_quadric_surfaces_introduction

[One page in a very thoroughly hyperlinked collection of documents]

The interactive examples are written in Java; so won't run on the iPad, but should be O.K. on the Mac.

.

Just to confirm … Yes, this ^^^ is a very informative site

I first had to install Java on the Mac.

[Apple's paranoia on my behalf allows me to authorise its use for specific sites only; which is some comfort in these evil times.]

MichaelG.

[choochoo_balooParticipant @choochoo_baloo]

Have regularly felt a bit like 'all take, no give' on this forum, always having my beginner-y questions helpfully answered, I'm pleased that I can offer input for once:

I'm currently studying a theoretical physics degree. If you have a reasonable grasp of elementary (secondary school level) maths then working your way through say an A Level maths revsion guide would give a budding home engineer extra insigbt for plotting, trigonometry etc.

Ignore those wallies who dismiss it as pretenious bulls*it (have not syndrome…) any advanced maths you can get to grips with is immensley satisfying. Enjoy it!

[Michael GilliganParticipant @michaelgilligan61133]

Thanks for the encouragement

I am finding that 'having a desire to understand, for a specific reason' is helping a lot.

MichaelG.

[Author]

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