I have had hardly any time for microscopy this month, but here is something with a Christmas theme:
Norman Chapman, Pam Hamer and I manned the Quekett stand on the final day of the National Honey Show on Saturday 1st November. We had specimens of honeybees, Varroa destructor Anderson & Trueman, and the small hive beetle (Aethina tumida Murray) and slides of pollen, and after the meeting I took photographs of them to use in the meeting report.
Tim Newton, Dennis Fullwood and I manned the Quekett stand at the annual exhibition of the British Entomological and Natural History Society in Conway Hall in London on Saturday 8th November, the first time that the Club has had a stand at this event. We wanted to show entomologists how microscopes can make their lives easier, so I had prepared some insects on a setting board using my Olympus SZ4045 stereomicroscope. This brought back memories; I was a teenager collecting butterflies the last time I set any insects, and I hadn’t even heard of stereomicroscopes then.
Alan Cooper’s presentation at the joint workshop with the Stereoscopic Society on Saturday 15th November reminded me that Zerene Stacker can extract synthetic stereo images from a stack and prompted me to have a go. Here is a rocking animated GIF of a pinned honeybee:
Alan Cooper recommended StereoPhoto Maker for producing stereoscopic images, so I exported 2 images from Zerene Stacker as a stereo pair and then used StereoPhoto Maker to produce images for free viewing and for red/cyan 3-D anaglyph glasses. I didn’t even need to read the StereoPhoto Maker Help.
The photo of a common spangle gall that I took in September was chosen to be displayed at the annual exhibition on Saturday 4th October, and I got a Barnard certificate for it. For my exhibit, I showed how defects in a crystal can be made very obvious using dark-ground illumination under a stereomicroscope, and how plastic films from greetings cards and food packaging can be used as waveplates to change the colours of crystals under crossed polarisers.
Mark Papp and I manned the Quekett stand at the Antique Scientific Instrument Fair on Sunday 26th October. There were some fascinating microscopes for sale, but at very high prices. However, it was great to be able to admire the workmanship in the old brass microscopes, and the ingenious ways that some of them had been designed to fit into tiny wooden boxes.
My attempts at DIY don’t often turn out very well, but here is one that did. I wanted a 5-way nosepiece to put on my Olympus CH-2 without borrowing one from my BH-2, and I obtained one from a wrecked BHTU, but its rubber grip was missing. It has taken me some time to find a suitable material, but now I have found a sheet of corrugated black rubber at the 4D Model Shop, not far from the Tower of London. It is 3 mm thick, which is just right. It was easy to cut a thin strip using a rotary trimmer, and fairly easy to stick it in place with UHU adhesive. I used a rubber band to hold it in place while the adhesive set.
The annual exhibition is approaching fast, so I must get my photos to David Linstead by 20th September. I will submit the nettle hairs that I shot in August, and I have plans for some others.
While I was in Thailand at the beginning of the month, I saw an item on the television news about processing blanket weed (filamentous algae) into small pellets and then using it to colour (pale green) and flavour ice cream in Chiang Mai. I have heard of Chlorella being hailed as a superfood, but not Spirogyra!
Sunday 14th September was Stables Open Day on Wimbledon Common, and Dennis Fullwood, Paul Smith, Barry Wendon and I were in the Information Centre with our microscopes and cameras. This was the busiest Quekett event I have been to, and I reckon we had over 200 visitors, far more than in previous years. Waterfleas and other pond life from Queensmere normally get the most attention, but this year spangle galls (caused by Cynipid wasps) on oak leaves were the star attraction.
I have sent a larger version of the single common spangle gall off to David Linstead. All 4 photos were taken with my Canon EOS 600D and 60 mm EF-S macro lens, with an additional +8 dioptre close-up lens for the single gall; I used EOS Utility to make the focus steps. They are all stacks of about 20 images in Zerene Stacker.
On Saturday 2nd August, I went to the Rock Gem ‘n’ Bead Show at Kempton Park and bought a couple of specimens for my exhibit at Quekex (Saturday 4th October, with crystals as the main topic). As usual, Dennis Fullwood was there with the Kent Geologists’ Group and half a dozen microscopes, encouraging visitors old and young to try their hand at mounting microfossils.
On Saturday 9th August, I didn’t take a trinocular microscope on the Quekett excursion to Warnham Local Nature Reserve because it is a 25-minute walk from Horsham station, and then wished that I had made the effort because there were so many rotifers in the samples from the dipping ponds. In the afternoon I spotted a common lizard sunning itself on a fence, and I managed to get close enough to photograph it.
The next day, Sunday 10th August, as part of the Club’s outreach programme Graham Matthews and I were back at the Reserve for their I-Spy Nature Day aimed at local families. I took 2 microscopes that are suitable for children, a new Chinese stereo with fixed 20× magnification and built-in LED illumination for under £40 from eBay seller gt-vision, and my old Meopta portable compound (with Ikea Jansjö LED lamp).
With pond life left over from the previous day’s excursion and specimens that people brought to us, we had plenty of material to educate and entertain a good crowd of children and parents, including stinging nettles.
I am hopeless at public speaking, but I managed to stumble through the introduction to the Quekett gossip on “My Latest Microscopical Acquisition” on Tuesday 8th July, with a PowerPoint presentation listing the international eBay categories that I have found useful for microscopes, and translations of useful phrases such as “Time: newly listed” and “Save search”.
On Saturday 13th July, I took my Olympus SZ4045 stereomicroscope to the first Wimbledon Common BioBlitz. Paul Smith, Dennis Fullwood and Barry Wendon were there too, as part of the Club’s outreach programme. At the next BioBlitz on the Common, there are plans to include organised pond-dipping in Queensmere, encouraging visitors to bring their finds to the Centre to examine them with our microscopes.
To complete my trinocular compound microscope that is light enough to carry on public transport, I bought a refurbished Canon EOS 600D camera from eBay seller canon_uk1. I chose this camera model because it is the lightest one with an articulated LED screen that can face forwards when the camera is pointing down. The screen isn’t level in the photograph below because Canon have restricted the rotation of the screen to 175°; I don’t understand why.
On Saturday 26th July, I took my Olympus CH-2 and EOS 600D to Brookwood Memorial Hall for the Quekett’s excursion to the Basingstoke Canal, the first time I have used them away from home. Everything worked, but it is definitely not as easy as the experts like Graham Matthews and Tony Pattinson make it look.
We spent 3 weeks in Thailand, but as usual family problems took nearly all of our time. We did manage to get to the seaside for a few hours and I collected sand from the beach at Cha-am on the west coast of the Gulf of Thailand for Paul Smith. The sand looked quite pale so I was hoping for some forams, but the only biological material seems to be bits of shell.
At the gossip meeting “NBS – Products and Reminiscences” on Tuesday 10th June, James Rider and Kit Brownlee each showed an NBS Polarspex but they were not photographed. I couldn’t attend the meeting, so I photographed my Polarspex for inclusion in the meeting report.
Saturday 21st June was the Quekett Microscopical Club’s Young Scientists’ Day based in the Angela Marmont Centre in the Natural History Museum. I took an assortment of specimens and my 2 smallest microscopes, an old Meopta portable compound (with Ikea Jansjö LED lamp) and a new Chinese stereo with fixed 20× magnification and built-in LED illumination for under £40 from eBay seller gt-vision.
|Meopta portable microscope||GXM STX 20× stereomicroscope|
Chasing pondlife from the Museum’s Wildlife Garden around a 55 mm Petri dish under a stereomicroscope reminded me to look for some smaller dishes on eBay. I found only one seller with smaller dishes, and ordered a pack of ten 30 mm ones from Hong Kong. They came quickly, but they are not as small as claimed; the base is 35 mm and the top 40 mm. The field of view of my Olympus SZ4045 stereomicroscope at its lowest magnification (6.7×) is 35 mm, so I can just see a whole dish at once.
Here is something you don’t see very often – a photograph of me – because I am normally taking the photographs. This was taken in the Information Centre on Wimbledon Common during the Club’s excursion on Saturday 17th May.
My Olympus BH-2 is too heavy for me to take it on Quekett excursions by public transport (I can’t drive), so I have been looking for something lighter. I took a chance on a CH-2 stand that someone had found in their garden shed. Cleaning out the dead leaves, insects and spiders was easy, and the paintwork cleaned up nicely with a paste of sodium bicarbonate, but the coarse focus would not move. I found that a previous owner had dissolved out all of the lubricant and turned the tension all the way up. Several turns of the tension control got the focus moving enough to start introducing some lubricant from OSIM Optik Shop, and I soon had a functioning stand. At the 2013 Reading Convention, Tony Pattinson had convinced me that it was easy to remove the 4-way nosepiece and replace it with a 5-way one from a BH-2 after removing the dovetail, and he was right; the screws were very tight but I managed to undo them with the proper JIS screwdriver. However, I found that not all nosepieces can be fitted to a CH-2; you need to find one that has 2 empty screw holes, one on each side of the removable dovetail, as in the left picture below.
I still had the set of Olympus A objectives that came with my BH-2 (now upgraded to S Plans) and some spare WHK eyepieces, so I now have a complete and working CH-2 with 5 objectives. Now I need a lighter camera to go with it.
I have been working on a demonstration of the 4 different types of phase contrast that Olympus provided for the BH-2 and other microscopes of that generation; PLL (positive low low), PL (positive low), NM (negative medium) and NH (negative high). I got the photographs ready just in time for the 25th meeting of the South Thames Discussion Group at Cobham on Saturday 1st March, and used the same setup again at the 2014 Reading Convention on Saturday 8th March.
I can’t carry my BH-2 on public transport, so I took my Olympus CK2 inverted microscope instead, with a monocular head and plain stage to keep the weight down.
Martin Hinchcliffe sold all of his beautifully-made brass specimen holders at Microscopium in October before I had a chance to buy one, but he has made a new batch and I have now bought one.
It comes with one 30 mm cork ball, one 30 mm brass ball with a cork insert, and 2 spare inserts. The weight of the brass ball and the friction of the cork one keep specimens at the angle you want under a stereomicroscope or a camera.