Search found 1276 matches

by Charles
Wed Jul 22, 2020 1:07 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 64
Views: 4401

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 1199 times
Santa Monica Keeper 2.jpg
Santa Monica Keeper 2.jpg (69.68 KiB) Viewed 1199 times
Santa Monica Keeper 3.jpg
Santa Monica Keeper 3.jpg (81.18 KiB) Viewed 1199 times
Santa Monica Keeper 4.jpg
Santa Monica Keeper 4.jpg (67.34 KiB) Viewed 1199 times
by Charles
Wed Jul 22, 2020 1:03 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 64
Views: 4401

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: 1792

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: 850

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: 707

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: 5390

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: 64
Views: 4401

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: 64
Views: 4401

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: 64
Views: 4401

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: 64
Views: 4401

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: 670

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: 666

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: 64
Views: 4401

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: 64
Views: 4401

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: 64
Views: 4401

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
by Charles
Thu Jul 02, 2020 2:01 pm
Forum: Specimens, samples and slides
Topic: New Diatom Project
Replies: 64
Views: 4401

Re: New Diatom Project

An update to this project. I have tried to clean the Nevada specimen of the very fine debris and particles by monitoring the settling times after adding distilled water to 10ml test tube and agitating. Used drops of sample onto a slide in five minute intervals and examining under a scope to view the...
by Charles
Thu Jul 02, 2020 11:38 am
Forum: Specimens, samples and slides
Topic: Diatom selection experience
Replies: 38
Views: 2942

Re: A tip and a question about a slide of clean diatoms without silt

I noticed that your diatoms, the ones that you pick under the stereo microscope view, are clearly visible - the contrast against the background is very good. Is it "ordinary" transmitted illumination ? the original lamp of the microscope ? I use both transmitted light, original lamp from the base a...
by Charles
Wed Jul 01, 2020 10:30 pm
Forum: Specimens, samples and slides
Topic: Diatom selection experience
Replies: 38
Views: 2942

Re: A tip and a question about a slide of clean diatoms without silt

Excellent work around Doron!
by Charles
Mon Jun 29, 2020 10:28 pm
Forum: Beginner's corner
Topic: Is this Leitz SM LUX any good?
Replies: 20
Views: 1249

Re: Is this Leitz SM LUX any good?

Katie2020 wrote:
Mon Jun 29, 2020 7:41 pm
Thanks guys for the advice, you've convinced me! I'll focus on the binocular.

Edit: maybe not, the microscope listed on that page isn't available on the shop website and i can find anything else <£250
On the Brunel link, the Leitz SM Lux binoc is still available for 195.83.
by Charles
Sun Jun 28, 2020 10:18 pm
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 4161

Re: Best DIC options?

I don't remember seeing that chart. It's a great reference. I checked the prisms in my Zeiss DIC condensers with the 465285 number and two had matching numbers for the 465285 and one had the 434404 and 434405. I saw signs of small delamination in the 465285 but none in the 434404/05. Maybe the older...
by Charles
Sun Jun 28, 2020 7:23 pm
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 4161

Re: Best DIC options?

The special tool is nice but not needed. All that holds the prisms in is an rubber O ring. All you need to do is pop one out, turn it and pop it back in.
by Charles
Sun Jun 28, 2020 7:11 pm
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 4161

Re: Best DIC options?

There are two different sets of prisms in the 46-52-85 and the 46-52-73 condensers. The prisms will match the condenser numbers. Open up the back of your condenser and see. The 46-52-85 condenser will have prisms 46-52-85 < and = to 16 and 46-52-85 >and = to 40. The 46-52-73 condenser will have the ...
by Charles
Sat Jun 27, 2020 2:48 pm
Forum: Microscopes and optics
Topic: Best DIC options?
Replies: 57
Views: 4161

Re: Best DIC options?

May I suggest there are five different Zeiss DIC condensers made for the 160 TL finite systems. The first had 3 prisms and the second another prism was added to include a fourth prism for the 6.3X objective and there was no empty J position. There are also two different DIC condensers with the S and...
by Charles
Thu Jun 25, 2020 7:48 pm
Forum: Collecting microscopes and slides
Topic: Zeiss research microscope?
Replies: 8
Views: 1312

Re: Zeiss research microscope?

According to the Gubas book of Zeiss microscopes, the serial number matches to 1927. They made both a DSG and DSB models and yours with the circular stage matches with the DSB. The D stands were made between 1925 to 1932.
by Charles
Wed Jun 24, 2020 11:15 pm
Forum: Introduce yourself
Topic: new to microscopy need help properly identifying my microscope
Replies: 13
Views: 1378

Re: new to microscopy need help properly identifying my microscope

This has a list of your features and diagram:
EpiStar.JPG
EpiStar.JPG (137.28 KiB) Viewed 1311 times
by Charles
Wed Jun 24, 2020 10:19 pm
Forum: Introduce yourself
Topic: new to microscopy need help properly identifying my microscope
Replies: 13
Views: 1378

Re: new to microscopy need help properly identifying my microscope

You have an AO Epistar 2560 with epi DIC. You have the version with both epi and transmitted lighting. You should also have an analyzer under the head and polarizar on one of the filters along the top back. Excellent scope. I have a manual if you need it. Here is mine: AO Epistar with DIC Side.JPG
by Charles
Sat Jun 20, 2020 5:22 pm
Forum: Collecting microscopes and slides
Topic: Interesting Slide!
Replies: 16
Views: 2960

Re: Interesting Slide!

That is unusual. I've never seen a slide like that. I don't see how the taper would help with view that specimen. It would make it more difficult to view because you would be constantly trying to get it in focus. Probably just a defect in that slide.
by Charles
Sat Jun 20, 2020 5:18 pm
Forum: Microscopes and optics
Topic: Are black, grey, and white the only colors for a scope..or would you want something else?
Replies: 20
Views: 2725

Re: Are black, grey, and white the only colors for a scope..or would you want something else?

That is very nice Terry!

I prefer the all brass or brass and black, but if I wanted to go with a color, it would be red.
by Charles
Sat Jun 20, 2020 5:16 pm
Forum: Microscopes and optics
Topic: Zeiss Standard - help
Replies: 4
Views: 1248

Re: Zeiss Standard - help

I have found some stuck pins but an easy fix is take the cap off, add some solvent or lubricant and work the pin back and forth until it frees up and moves easily.