From Newsgroup: rec.crafts.metalworking

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a spectrophotometer?
--
Bob La Londe
CNC Molds N Stuff

--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

In <112jl2f$1ja37$1@dont-email.me> Bob La Londe <none@none.com99> writes:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a >spectrophotometer?

age 10 or so in a science/photogrphy demo/class
in summer camp
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

On 7/7/2026 1:04 PM, danny burstein wrote:

In <112jl2f$1ja37$1@dont-email.me> Bob La Londe <none@none.com99> writes:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a
spectrophotometer?

age 10 or so in a science/photogrphy demo/class
in summer camp

I had not even thought of it being used in directly normal image
photography. What was the application? ie. What did you do with it, or
what was its use?
--
Bob La Londe
CNC Molds N Stuff
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

In <112jrmf$1jg8c$1@dont-email.me> Bob La Londe <none@none.com99> writes:

On 7/7/2026 1:04 PM, danny burstein wrote:

In <112jl2f$1ja37$1@dont-email.me> Bob La Londe <none@none.com99> writes:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a
spectrophotometer?

age 10 or so in a science/photogrphy demo/class
in summer camp

I had not even thought of it being used in directly normal image >photography. What was the application? ie. What did you do with it, or >what was its use?

A series of photos as we'd heat up various materials on
a Bunsen Burner....
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

On 7/7/2026 2:43 PM, danny burstein wrote:

In <112jrmf$1jg8c$1@dont-email.me> Bob La Londe <none@none.com99> writes:

On 7/7/2026 1:04 PM, danny burstein wrote:

In <112jl2f$1ja37$1@dont-email.me> Bob La Londe <none@none.com99> writes: >>>

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a >>>> spectrophotometer?

age 10 or so in a science/photogrphy demo/class
in summer camp

I had not even thought of it being used in directly normal image
photography. What was the application? ie. What did you do with it, or
what was its use?

A series of photos as we'd heat up various materials on
a Bunsen Burner....

You were using it to take photos? Spectral analysis for identifying materials?
--
Bob La Londe
CNC Molds N Stuff
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

In <112jsnt$35scm$1@dont-email.me> Bob La Londe <none@none.com99> writes:

A series of photos as we'd heat up various materials on
a Bunsen Burner....

You were using it to take photos? Spectral analysis for identifying >materials?

More than, umm, let's simply say a long time ago, but I remember
at least putting blocks of (what looked like salt/NaCl) onto the
grills then comparing block #1 with #2, etc. They looked the same
on the prep table but were very different when heated...
--
_____________________________________________________
Knowledge may be power, but communications is the key
dannyb@panix.com
[to foil spammers, my address has been double rot-13 encoded]
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking


danny burstein <dannyb@panix.com> posted:

In <112jsnt$35scm$1@dont-email.me> Bob La Londe <none@none.com99> writes:

A series of photos as we'd heat up various materials on
a Bunsen Burner....

You were using it to take photos? Spectral analysis for identifying >materials?

More than, umm, let's simply say a long time ago, but I remember
at least putting blocks of (what looked like salt/NaCl) onto the
grills then comparing block #1 with #2, etc. They looked the same
on the prep table but were very different when heated...

We did something much more crude in high school chemistry. We would just stick a piece of material in the flame of a bunsen burner and note that it changed the color of the flame depending on what the material was.
--
Bob La Londe
CNC Molds N Stuff
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

"Bob La Londe" wrote in message news:112jl2f$1ja37$1@dont-email.me...

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a spectrophotometer?
--
Bob La Londe
CNC Molds N Stuff

-----------------------------------

in the summer of 1966, between my college freshman and sophomore years, I received an NSF research grant that involved analyzing my chemistry results with an Infrared Spectrophotometer. I began to suspect that I liked the electronic instruments better than the chemistry and maybe should have
chosen Electrical Engineering, though I stayed in Chemistry to a BS degree.

I also used a room-sized visible light spectrograph built in the 1930's
whose spectral output went on 4" x 10" glass photographic plates instead of
an electronic photometer.

This and a glass prism are all I presently own. https://www.fishersci.com/shop/products/eisco-quantitative-spectroscope/S07816?

At graduation time I was 4 credits short, any subject would do. I signed up
as a carpenter for the 6 credit, pass/fail summer theatre program and
learned a lot about managing people less capable, responsible and self-disciplined than chemists. After completing the set I sat in the
audience with the director to see how it was used and might be modified,
also to observe them repeatedly coaxing a maximum effort from the tiring actors and dancers throughout a 12-14 hour day. The musical "A Chorus Line"
is a fine example.

By then the grad school draft deferment has been cancelled, ending that
career path beyond a lab tech job. The Army appeared to offer the best
choice of electronic school, and when they saw my test scores they offered
me their invitation-only longest and hardest school, repairing crypto
machines which are nearly computers. We had to memorize them well enough to not need to carry the classified manuals on field service calls. After the draft ended and science and engineering grads became unavailable the Army
was forced to degrade the task from component level troubleshooting to board-swapping.

Perhaps because I listed German as a foreign language I was deployed there, instead of Vietnam, Turkey or Ethiopia (Yuk!). However I met Vietnam vets
who were eager enough to go back to Saigon that they reenlisted. https://en.wikipedia.org/wiki/Kagnew_Station

This was Air Force personnel and earlier, but still... https://en.wikipedia.org/wiki/Battle_of_Lima_Site_85

At the start of Army Basic the drill sergeant told us we were beginning the second most physically demanding job in the world, the first being dancer. I've seen that and had to agree. I was in dance rehearsal when Armstrong landed on the moon.

--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

"Bob La Londe" wrote in message news:1783465333-16941@newsgrouper.org...

We did something much more crude in high school chemistry. We would just stick a piece of material in the flame of a bunsen burner and note that it changed the color of the flame depending on what the material was. ------------------------
A variation of that enables prospectors to smelt and identify ore in the wilderness. https://www.911metallurgist.com/blog/blowpipe-analysis-for-testing-minerals/

--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

On 7/7/2026 2:46 PM, Bob La Londe wrote:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used).-a When was the first time you used a spectrophotometer?

I can't remember ever using one ... but I almost bought a
refractometer to check moisture content in my honey . Then my bees all
started dying and I didn't need one because there was no honey to check
. I and many other beekeepers suspect there is a direct causal link
between bee die offs and the chemicals they're spraying from those
airplanes .
--
Snag
I appreciated foreign cultures more
when they stayed foreign ...
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

"Bob La Londe" wrote in message news:112jl2f$1ja37$1@dont-email.me...

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used). When was the first time you used a spectrophotometer?
Bob La Londe

-------------------------------

The first time I used a thermal imager I knew I had to have one when the
price became reasonable. In addition to revealing house insulation defects
and hot wiring connections they are great for walking in the dark.

Who has used a spectrum or vector network analyzer? https://www.keysight.com/used/us/en/knowledge/guides/network-analyzer-vs-spectrum-analyzer

My early 80's introduction to the Time Domain Reflectometer was trimming a batch of coax cables to match a standard, within 1/8". The propagation speed of electrical signals in the cable was around 6 - 7 inches in a billionth of
a second, less than the vacuum speed of light due to inductance and capacitance.

The cables connected a computer memory chip tester to the RAM chip wafer prober head on the production line. The cables held three sequential address and data write patterns going out and three reads coming back. The tester detected and marked faulty chips and measured the access speed to sort them, the faster memory brought a higher price.
https://anysilicon.com/wafer-probe/

The market pressure to increase operating speed and reduce size, the number
of devices on a wafer, keeps the IC manufacturing process near the edge of failure despite improvements.

--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

On 7/7/2026 9:14 PM, Snag wrote:

On 7/7/2026 2:46 PM, Bob La Londe wrote:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used).-a When was the first time you used a
spectrophotometer?

-aI can't remember ever using one ... but I almost bought a
refractometer to check moisture content in my honey . Then my bees all started dying and I didn't need one because there was no honey to
check . I and many other beekeepers suspect there is a direct causal
link between bee die offs and the chemicals they're spraying from those airplanes .

Around here I think Permethrin is one of the big pesticides. I have a
small container of it around here somewhere a farmer buddy gave me for
my vegetable garden to keep borers out of my sweet corn.

That being said we have healthy bee hives in the area including wild
hives. Last year I had three hives side by side under a shipping
container. They had started to become aggressive and I was stung
several times over a couple months. I am not afraid of bees, and except
for the painful initial sting have little reaction. I still had to have
them removed. The removal guy didn't know what to do to get to them, so
I jacked and blocked up the container on one side. That's when we saw
there were three separate hives. They may have been getting ready to
swarm as we pulled out a 8 or 9 queens.

The bee guy said he thought they might have been africanized hybrids
which is why they started stinging me. Somebody who normal doesn't get
stung. I think they were over growing their space and were getting
ready to swarm and create some new hives. We tore out most of the
combs, and sprayed it a year ago last spring, and the other day there
were bees flying under the container again. They are persistent
buggers. I'll leave them alone until they get aggressive again.



"Permethrin is a highly toxic synthetic pyrethroid insecticide that acts
on the nervous system of insects. Direct contact with wet spray or
lingering residue can cause severe paralysis and death in honey bees and
wild pollinators.

Sub-lethal exposure also alters bee foraging behavior.Key Effects on Bees

High Toxicity: Permethrin disrupts the sodium channels in neurons,
leading to rapid muscle spasms, paralysis, and death. It is considered
highly toxic to honeybees and other beneficial insects.

Contamination: Permethrin can bind to beeswax if exposed, which creates
a long-term contamination risk within the hive.

Behavioral Changes: Bees exposed to non-lethal doses exhibit abnormal behaviors, such as excessive self-cleaning, trembling, and reduced
foraging trips.

Repellent Properties: Some field observations suggest permethrin has a
mild repellent effect, which can deter bees from entering treated areas, though this does not completely eliminate the risk of mortality."
--
Bob La Londe
CNC Molds N Stuff
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

On 7/7/2026 12:46 PM, Bob La Londe wrote:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used).-a When was the first time you used a spectrophotometer?

I never heard of one until the early 90s when a store I worked for (Tool
& Supply Co of Yuma) bought one used when they bought out a bunch of
equipment from a closed paint store. We used it as a guess-o-meter for matching paint samples. A few years later I found the newer model in WalMart's paint department was also just a guess-o-meter.

As a contractor I learned to just drop off a sample at the local Sherwin Williams paint store, let them match it at their liesure, and have them
call me when it was ready.
--
Bob La Londe
CNC Molds N Stuff
--- Synchronet 3.22a-Linux NewsLink 1.2

From Newsgroup: rec.crafts.metalworking

On 7/8/2026 2:35 PM, Bob La Londe wrote:

On 7/7/2026 9:14 PM, Snag wrote:

On 7/7/2026 2:46 PM, Bob La Londe wrote:

Since a tool I figured was more likely to have seen common or semi
common use got no traction I figured I'd ask about a tool I have no
current use for (but I have used).-a When was the first time you used
a spectrophotometer?

-a-aI can't remember ever using one ... but I almost bought a
refractometer to check moisture content in my honey . Then my bees all
started dying and I didn't need one because there was no honey to
check . I and many other beekeepers suspect there is a direct causal
link between bee die offs and the chemicals they're spraying from
those airplanes .

Around here I think Permethrin is one of the big pesticides.-a I have a small container of it around here somewhere a farmer buddy gave me for
my vegetable garden to keep borers out of my sweet corn.

That being said we have healthy bee hives in the area including wild hives.-a Last year I had three hives side by side under a shipping container.-a They had started to become aggressive and I was stung
several times over a couple months.-a I am not afraid of bees, and except for the painful initial sting have little reaction.-a I still had to have them removed.-a The removal guy didn't know what to do to get to them, so
I jacked and blocked up the container on one side.-a That's when we saw there were three separate hives.-a They may have been getting ready to
swarm as we pulled out a 8 or 9 queens.

The bee guy said he thought they might have been africanized hybrids
which is why they started stinging me.-a Somebody who normal doesn't get stung.-a I think they were over growing their space and were getting
ready to swarm and create some new hives.-a-a We tore out most of the
combs, and sprayed it a year ago last spring, and the other day there
were bees flying under the container again.-a They are persistent
buggers.-a I'll leave them alone until they get aggressive again.

"Permethrin is a highly toxic synthetic pyrethroid insecticide that acts
on the nervous system of insects. Direct contact with wet spray or
lingering residue can cause severe paralysis and death in honey bees and wild pollinators.

Sub-lethal exposure also alters bee foraging behavior.Key Effects on Bees

High Toxicity: Permethrin disrupts the sodium channels in neurons,
leading to rapid muscle spasms, paralysis, and death. It is considered highly toxic to honeybees and other beneficial insects.

Contamination: Permethrin can bind to beeswax if exposed, which creates
a long-term contamination risk within the hive.

Behavioral Changes: Bees exposed to non-lethal doses exhibit abnormal behaviors, such as excessive self-cleaning, trembling, and reduced
foraging trips.

Repellent Properties: Some field observations suggest permethrin has a
mild repellent effect, which can deter bees from entering treated areas, though this does not completely eliminate the risk of mortality."

I use a permethrin spray to treat my woods clothing to prevent ticks
. The only other use here is indoors for flea and roach control . I
don't use any insecticides outdoors except for a limited area granular treatment for fleas where my dog's chain can reach . He loves being
outdoors where he can watch the driveway and road but we have a neighbor
who is a total asshole with double standards .
--
Snag
I appreciated foreign cultures more
when they stayed foreign ...
--- Synchronet 3.22a-Linux NewsLink 1.2