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Glass needle vs. other pointy things

 
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Beatsy



Joined: 05 Jul 2013
Posts: 665
Location: Malvern, UK

PostPosted: Tue Feb 07, 2017 2:10 pm    Post subject: Glass needle vs. other pointy things Reply with quote

When "normal folk" (i.e. not PMN members Smile ) see my diatom arrangements many ask how I move the diatoms around and hazard a guess that it's done with a pin or needle. Cue astonishment when I explain most diatoms are far smaller than the point of a typical pin.

After a real bad run of failures trying to make hand-pulled glass needles, I finally regained my mojo today and knocked up a goodly batch. I've never actually measured the tips of these needles before - so I had a look. A fresh needle point tapers to a micron or less. After some use selecting diatoms it wears down to a rounded point of about 2-3 microns and will stay that way for a long time (usually until I clumsily break it).

Here's a rough composite comparing a glass needle to some other "pointy things" I had kicking around. These are laid over a strew of large diatoms from Newport Beach to give a scale comparison. Images all taken with a 10x mitty on a 135mm tube lens and camera in crop sensor mode.

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zzffnn



Joined: 22 May 2014
Posts: 1101
Location: Texas USA

PostPosted: Tue Feb 07, 2017 2:23 pm    Post subject: Reply with quote

Nice image and very well made glass needle!

I image it would be very hard to keep the end straight like that.
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JH



Joined: 09 Mar 2013
Posts: 736
Location: Vallentuna, Stockholm, Sweden

PostPosted: Tue Feb 07, 2017 2:36 pm    Post subject: Reply with quote

Nice and interesting idea!
Regards Jörgen
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siliconGary



Joined: 18 Oct 2016
Posts: 36

PostPosted: Tue Feb 07, 2017 6:03 pm    Post subject: Reply with quote

Nice image. I am impressed you could arrange all those tips without them touching each other.
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abpho



Joined: 17 Aug 2011
Posts: 1413
Location: Earth

PostPosted: Tue Feb 07, 2017 7:23 pm    Post subject: Reply with quote

Wow. I never knew. Guess I'll scratch photographing diatomes of my list. (Way too small. Lol.)
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ChrisR
Site Admin


Joined: 14 Mar 2009
Posts: 6625
Location: Near London, UK

PostPosted: Tue Feb 07, 2017 7:57 pm    Post subject: Reply with quote

Quote:
Nice image. I am impressed you could arrange all those tips without them touching each other.
Laughing

Quote:
composite
= he didn't!
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