Walton/Becket eyepiece graticle Olumpus BX40

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mrsonchus
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Walton/Becket eyepiece graticle Olumpus BX40

#1 Post by mrsonchus » Wed Jun 26, 2019 7:33 pm

Hi all, I just received my Olympus BX40 and one of the eyepieces includes a (removable) reticle which, upon a quick search, turns out to be a "Walton/Becket" reticle, used for particle measurement & counting.
Here's an image of it,
ws_BX40 eyepiece reticle.jpg
ws_BX40 eyepiece reticle.jpg (22.4 KiB) Viewed 1949 times
I think this info is relevant, not sure..
ws_reticle with bx40.jpg
ws_reticle with bx40.jpg (29.4 KiB) Viewed 1949 times
It's 24mm diameter and is immaculate - I wonder if it may be useful?
Here's the actual reticle - apologies for poor image....
ws_walton becket reticle 24mm.jpg
ws_walton becket reticle 24mm.jpg (31.24 KiB) Viewed 1949 times
Does anyone know anything about it - what I may use it for if anything, or if I should sell it?

Thanks for any help or comments.
John B

PeteM
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#2 Post by PeteM » Wed Jun 26, 2019 9:10 pm

The cross hairs might be useful to you? For:

- checking that head optics are aligned
- check parcentering of objectives
- maybe measuring things either using the stage rulers or adding a DRO

MichaelG.
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#3 Post by MichaelG. » Wed Jun 26, 2019 10:21 pm

.
https://www.pyseroptics.com/graticules/ ... n-beckett/
.
https://www.2spi.com/category/graticules-walton/

I suggest you either take-up Asbestos analysis, or sell it, John

MichaelG.
Last edited by MichaelG. on Wed Jun 26, 2019 10:24 pm, edited 1 time in total.
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75RR
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#4 Post by 75RR » Wed Jun 26, 2019 10:24 pm

According to this site they are worth around £130 new

https://www.pyseroptics.com/product/g22/

Concurrent posting!
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mrsonchus
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#5 Post by mrsonchus » Wed Jun 26, 2019 10:38 pm

Thanks Michael, Pete & 75' - I think I may as well sell it - I can't see myself having a use for it really.

Thanks folks. I've put the BX40 together and it almost looks unused!
I'll post some images of it tomorrow. It has a couple of Achromats (x10 and x40) and a couple of the same magnification Phase objectives (Achromats also). It has the phase condenser, which is brighfield and darkfield capable too, beautifully made.

The performance is extremely good, especially considering these are the base-level Olympus UIS objectives - I'm very impressed indeed.

Back soon. :D
John B

PrecisionInstruments
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#6 Post by PrecisionInstruments » Thu Jun 27, 2019 6:28 am

Didn’t come with a HSE Test Slide did it?
I have a headache, For which the future’s made

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mrsonchus
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Re: Walton/Becket eyepiece reticle Olumpus BX40

#7 Post by mrsonchus » Thu Jun 27, 2019 8:51 pm

PrecisionInstruments wrote:Didn’t come with a HSE Test Slide did it?
No, there was just the reticle......
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Re: Walton/Becket eyepiece reticle Olumpus BX40

#8 Post by PrecisionInstruments » Sun Jun 30, 2019 9:33 am

mrsonchus wrote:
PrecisionInstruments wrote:Didn’t come with a HSE Test Slide did it?
No, there was just the reticle......
Bugger!! They’re worth a pretty penny
I have a headache, For which the future’s made

wabutter
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#9 Post by wabutter » Thu Jul 18, 2019 1:35 am

The Walton Becket eyepiece reticle is use by Industrial Hygienist for Asbestos Fiber Counting. Keep in mind this is not Asbestos Identification, but counting of particles that are collected from the air.

Regards,
Wayne

MichaelG.
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#10 Post by MichaelG. » Thu Jul 18, 2019 5:34 am

p13 of this brochure has a little more information than the links I posted previously
https://issuu.com/pysersgi/docs/pyser-s ... cles/18?ff

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mrsonchus
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#11 Post by mrsonchus » Thu Jul 18, 2019 7:48 am

That's the one.
It's no use to me so if anyone has a use for it just let me know, or I have it on flea-bay just to see if I can move it on...

Thanks all for your time.

John B.
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Crater Eddie
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#12 Post by Crater Eddie » Thu Jul 18, 2019 3:47 pm

mrsonchus wrote: I've put the BX40 together and it almost looks unused!
I'll post some images of it tomorrow.
Nudge nudge ;)
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mrsonchus
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#13 Post by mrsonchus » Thu Jul 18, 2019 6:00 pm

Crater Eddie wrote: Nudge nudge ;)
Hi Ed! Ahhh, yes, really must put up some images. I've been that busy believe it or not I actually didn't think to do it! :oops:
I'll take some images tonight and 'put-em-up' my old friend.

John B
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#14 Post by billbillt » Thu Jul 18, 2019 8:33 pm

Hello John B.,

Congrats on your new microscope!.. I am waiting to see photos of it and some subjects also...

The Best,
BillT

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mrsonchus
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#15 Post by mrsonchus » Thu Jul 18, 2019 10:22 pm

Hi there Bill! I know - I really should have posted some images by now.

Here are a few images of the new BX40 - and when I say new, of course it's a 90s 'scope but actually hadn't so much as a fingerprint upon it - looked unused, or virtually-so.....

The BX40 I now have with Canon 200D atop.
Image

Various views around the beauty...
Image

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A few quick images through 'scope with Canon DSLR and Canon's 'Utility v3' tethering software.
An epidermal-peel I took today while preparing some pieces of Foxglove stem (and ovaries as it happens) for fixative (should make a nice set of slides I think) simply water-mounted with coverslip, brightfield.
I like the way this stack has enabled the focus to move into the interior of the stomatal-pore somewhat, very nice detail for a water-mount, nice and clear. So far so good...
Image

A stomate from the epidermis of a Daffodil ovary TS - again nice detail for a single image, especially of the continuation of the epidermal cuticle around the 'doors' of the pore. Rather nice detail also of cytoskeleton and vacuoles within cells. Stained with Alcian-blue and Safranin.
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I think these are Teliospores of rust-fungus, beneath the epidermis of Sonchus.arvensis.
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This is 40x phase-contrast at ludicrously-high ISO (the std 30W halogen barely manages especially with the use (as here) of a green filter, image in mono with camera. Stained slides aren't much use (nor are they intended to be of course) with phase-contrast, but all my current slides are stained... This is part of the vascular bundle (xylem vessels) of a Sonchus.oleraceus in TS.
Image

Here is the same in brightfield, far better as expected.... Above the xylem is a 2-3 cell thick cambium and above that the phloem vessels and their companion cells (which 'load' sugars and other substances into and out of the phloem tubes).
Image

LS along xylem vessels. The central vessel is a mature secondary vessel-element and shows typical 'bordered' (elliptical-elongate) pits in the (dead) secondary cell-walls. These vessels are formed after cell-elongation has finished as their rigid structure would cause them to fracture if they were formed earlier, during primary growth. The vessel-walls formed during primary growth need to be able to accommodate cell elongation stages and so will have helical or circular (lignin) bands that fulfil this requirement - a readily observable character that allows identification of primary vs secondary xylem.... The vessel that has been torn by the microtome knife, to the left of the bordered pitted vessel, is such a vessel with helical lignification...
Image

Oh yes, here's a rudimentary darkfield image of the aforementioned epidermal-peel (of a Foxglove stem) as provided by the 'DF' position of the BX40's phase contrast condenser. Not the best but definitely of use....
Image

That's about all I had time to put together this evening.

I love this BX40's clarity and sheer resolution of detail. I have a nice-looking (oh-my I really hope so......) UPlanApo DRY 60x 0.9 n.a. with correction-collar infinity objective arriving tomorrow which will hopefully serve me well as my 'high-dry' go-to before the dreaded 100x oil is needed. I'm hoping the correction-collar will help this objective to perform to it's best as the 60x dry objectives are horribly sensitive without one..... Fingers very firmly crossed - I'll post images when I get it up & running.....

More tomorrow hopefully....

John B.
Last edited by mrsonchus on Thu Jul 18, 2019 10:59 pm, edited 1 time in total.
John B

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Re: Walton/Becket eyepiece graticle Olumpus BX40

#16 Post by MichaelG. » Thu Jul 18, 2019 10:50 pm

O.K. ... I'm impressed !!
[and more than a little envious]

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mrsonchus
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Re: Walton/Becket eyepiece graticle Olumpus BX40

#17 Post by mrsonchus » Thu Jul 18, 2019 11:04 pm

Thanks Michael, it's a beauty!

I've moved (duplicated actually) this post over to a new thread of it's own - just realised this was originally about the graticle..... :oops:

John B.
John B

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