Search found 1260 matches

by Charles
Fri Aug 07, 2020 10:34 pm
Forum: Microscopes and optics
Topic: Help with disassembly and repair of zeiss phase condenser
Replies: 20
Views: 291

Re: Help with disassembly and repair of zeiss phase condenser

DrPhoxinus wrote:
Thu Aug 06, 2020 1:48 pm
May I ask you how many scopes do you own?
Gerard, I own quite a few...hundred? I don't know the count and no estimate. I like collecting the old, rare and interesting microscopes and stereo scopes
by Charles
Fri Aug 07, 2020 10:31 pm
Forum: Specimens, samples and slides
Topic: Attempts at Diatom Arranging
Replies: 11
Views: 196

Re: Attempts at Diatom Arranging

KurtM wrote:
Fri Aug 07, 2020 6:41 pm
I guess next up is experiment with further thinning the Naphrax, which is already of a watery consistency.
Kurt, I think you should go thicker. The more Toluene you use to dilute the more it will bubble? Also try heating the adhesive after the arrangement.
by Charles
Fri Aug 07, 2020 1:14 pm
Forum: Specimens, samples and slides
Topic: Attempts at Diatom Arranging
Replies: 11
Views: 196

Re: Attempts at Diatom Arranging

Hi Kurt, Moving frustules while heating the mountant has been a constant problem in my mounts. Can you explain your method? What adhesive did you use? After arranging and before the mountant, did you dry the adhesive first by heating? Did you use a drop of solvent (Toluene)first to evacuate the air ...
by Charles
Thu Aug 06, 2020 12:42 am
Forum: Microscopes and optics
Topic: Help with disassembly and repair of zeiss phase condenser
Replies: 20
Views: 291

Re: Help with disassembly and repair of zeiss phase condenser

I tried painting a couple which had not completely lifted off and pieces were missing. I had to give it three coats but it came out pretty good. If you have a good template, it should be doable. Maybe you could use electrical tape and a sharp X-acto or surgical knife.
by Charles
Wed Aug 05, 2020 12:04 am
Forum: Microscopes and optics
Topic: Help with disassembly and repair of zeiss phase condenser
Replies: 20
Views: 291

Re: Help with disassembly and repair of zeiss phase condenser

As you can see in the above photos, the phase annuli are like glass flat bottom bowls with rims which are held down by the threaded collars. You will need a spanner wrench to unscrew the collars. The larger diameter holes are usually used for darkfield annuli or other filters.
by Charles
Fri Jul 31, 2020 8:14 pm
Forum: Specimens, samples and slides
Topic: Pleurax synthesis?
Replies: 3
Views: 155

Re: Pleurax synthesis?

I've never made either but here is the steps for Naphrax. I haven't seen any warnings like for Pleurax but I would recommend a fume hood. NAPHRAX Substances: -Glacial acetic acid 200 ml -Naphthalene 50 g -Paraformaldehyd 12,5 g -p-Toluenesulfonic acid (monohydrate) 5 g Apparatus: 500 ml flask, water...
by Charles
Sun Jul 26, 2020 11:45 pm
Forum: My microscope
Topic: My Microscope Build
Replies: 10
Views: 350

Re: My Microscope Build

Very nice microscope setup and photos!
by Charles
Sun Jul 26, 2020 11:43 pm
Forum: Pictures and Videos
Topic: Up Close to a Maple Tree Seed
Replies: 5
Views: 117

Re: Up Close to an Oak Tree Seed

I thought you get acorns from oak trees. Maybe this is a seed from a maple?
by Charles
Fri Jul 24, 2020 2:00 pm
Forum: Specimens, samples and slides
Topic: The Importance of Proper Slide Storage
Replies: 8
Views: 224

Re: The Importance of Proper Slide Storage

A very good point Kurt! I have used flat cardboard slide holders while working on diatom slides and have recently obtain some nice plastic ones with clear lids so I can see whats in them. I also use the wooden Eberbach cabinet and some antique cabinets to keep my slides flat during storage. You can ...
by Charles
Fri Jul 24, 2020 12:29 pm
Forum: Microscopes and optics
Topic: Zeiss standard expansion/ upgrades
Replies: 30
Views: 576

Re: Zeiss standard expansion/ upgrades

Looks like a Zeiss Standard 14/15. The built in rheostat probably went bad and they did the external power source. If you have problems finding that grub screw, I can send you one and maybe a condenser. I have spares of both BF and Phase. Shipping would be high though going from US to UK.
by Charles
Fri Jul 24, 2020 12:24 pm
Forum: Identification help
Topic: Please help with identification of a very small circular organism
Replies: 2
Views: 105

Re: Please help with identification of a very small circular organism

Picture and video isn't quite clear, but I would say it moves like a Phacus.
by Charles
Thu Jul 23, 2020 12:33 pm
Forum: Microscopes and optics
Topic: Zeiss standard expansion/ upgrades
Replies: 30
Views: 576

Re: Zeiss standard expansion/ upgrades

Zeiss bright field condensers are very easy to obtain. They are normally 0.9 and 1.4 NA flip top condensers and are reasonably priced...at least they are in the US. The rotating Zeiss phase condensers are also available and most have BF along with 2-3 phase stops and some even have a DF stop. Which ...
by Charles
Wed Jul 22, 2020 2:00 pm
Forum: Camera systems and imaging
Topic: Photo tube missing, need replacement
Replies: 1
Views: 79

Re: Photo tube missing, need replacement

Contact whomever you bought the scope from.
by Charles
Wed Jul 22, 2020 1:07 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

Some other views of the keeper slide:
Santa Monica Keeper 1.jpg
Santa Monica Keeper 1.jpg (81.5 KiB) Viewed 275 times
Santa Monica Keeper 2.jpg
Santa Monica Keeper 2.jpg (69.68 KiB) Viewed 275 times
Santa Monica Keeper 3.jpg
Santa Monica Keeper 3.jpg (81.18 KiB) Viewed 275 times
Santa Monica Keeper 4.jpg
Santa Monica Keeper 4.jpg (67.34 KiB) Viewed 275 times
by Charles
Wed Jul 22, 2020 1:03 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

I moved on to the Santa Monica diatomite last weekend...Friday pm to Sunday pm. I cleaned it as well as I could and the strews are still very 'dirty', mostly broken or damaged and very few to pick from, as can be seen in the first photo below. Still there are some very interesting diatom species and...
by Charles
Tue Jul 21, 2020 10:56 pm
Forum: Specimens, samples and slides
Topic: Audibly crushing a diatom
Replies: 27
Views: 568

Re: Audibly crushing a diatom

I would think that different species will have different mechanical strength. Some frustules I can push a glass needle through and others can break my glass needle. No wonder they can last for thousands of year and come out cleaned like they first died and floated to the bottom of the water column.
by Charles
Tue Jul 21, 2020 10:42 pm
Forum: Beginner's corner
Topic: How do you collect diatoms.
Replies: 4
Views: 222

Re: How do you collect diatoms.

Another good post on diatom processing is Rod's:
viewtopic.php?f=10&t=3036
by Charles
Thu Jul 16, 2020 8:34 pm
Forum: Sandbox
Topic: Antique Microscopes.
Replies: 10
Views: 240

Re: Antique Microscopes.

That is quite a nice collection of microscopes for a display at the airport. Must have been on load from a museum.
by Charles
Thu Jul 16, 2020 8:30 pm
Forum: Collecting microscopes and slides
Topic: Antique Slide Cabinet and Slides
Replies: 26
Views: 4004

Re: Antique Slide Cabinet and Slides

Hi Kirby,

That's a great looking slide cabinet! I would love to find something like that.
by Charles
Fri Jul 10, 2020 5:29 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

Kurt,
I am using the alcohol lamp. I put the wick as far down as it will go and still maintain a flame. Sometimes the wick needs to be trimmed.
by Charles
Wed Jul 08, 2020 11:10 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

Charles, I finally made it home today, and wonder if you can point me to your needle-pulling discussions, and/or anything else on the subject you think worthy of attention? I intend to revisit the needle-puller apparatus that Keith has been working on, as it especially piques my interest. But I hav...
by Charles
Wed Jul 08, 2020 10:55 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

Sabatini wrote:
Wed Jul 08, 2020 8:12 pm
Thanks You for Show us this excelent work.
Thank you Sabatini.
by Charles
Tue Jul 07, 2020 2:28 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

Hello Kurt,

Hope you are able to get home soon. needle pulling is a matter of temperature (low), technique and practice. I've gotten to where I get two needles with one tube and very little waste.
by Charles
Tue Jul 07, 2020 2:25 pm
Forum: Introduce yourself
Topic: Hi, I'm new here
Replies: 7
Views: 325

Re: Hi, I'm new here

Welcome Luca,

Many here hide their names with aliases.
by Charles
Tue Jul 07, 2020 2:19 pm
Forum: Beginner's corner
Topic: 'Noise' when viewing at higher magnifications
Replies: 12
Views: 302

Re: 'Noise' when viewing at higher magnifications

Welcome Luca, If rotating the eye pieces, objective or moving the condenser does not move the 'spots', it maybe what is termed as 'eye floaters', which usually can not be removed and which can be more pronounced with higher power optics. After awhile and focusing/concentrating on the specimen, the f...
by Charles
Fri Jul 03, 2020 12:57 am
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

Thank you Zuul. It really isn't that hard. It just a matter having a proper setup, tools and time doing it. Someone said it takes about 10000 hours to be proficient. I have about 1000 hrs in doing this.
by Charles
Fri Jul 03, 2020 12:53 am
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

MicroBob wrote:
Thu Jul 02, 2020 4:52 pm
so the water contained diatoms until about the 45th minute?
Bob
Hello Bob,
Yes, about 45 min and most of the diatoms from this sample have settled in a 10 ml tube. It will vary from different samples. Samples I tested in my other post took about 5 minutes.
by Charles
Thu Jul 02, 2020 2:04 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 57
Views: 2650

Re: New Diatom Project

I posted a video on YouTube of moving the selected diatoms from a strew slide to my keeper slide.
https://www.youtube.com/watch?v=UlZhqMU ... e=youtu.be