Watch Model: Jules Racine & Co. 1018672
Movement Model: Excelsior Park No 3364R
Mass: 79.96g (without string attached)
Outer diameter: 50.3mm
Crystal diameter: 42.75mm, 0.89mm thick
Not worth repair.
At full-throw of the pallet fork, the pallet stone does not clear the ratchet wheel tooth:
After mainspring replacement, the watch ticked through two or three teeth of the ratchet wheel, then get stuck. Normally, I would look into adjusting the ratchet wheel or pallet fork, but since the case was bent and the crystal shattered, I believe the entire movement was slightly warped throughout. When resassembling, the bridge holes didn’t quite line up, further indicating the whole movement is bent.
This will never be a complete list, but there does not seem to be a good list of watch battery type by model online to even get an idea. Have to start somewhere! Owner’s manuals are not always available so usually you have to open the watch and take out the old battery.
Watch Batteries in a Flash has this good cross reference once you know one of the battery identifiers.
Also, from Watch Batteries in a Flash, PRO TIP: If you are having a hard time determining your battery, measure the width of the battery and then the height. Use the dimensions against the Dimensions column to find the battery that you need. You can also use a micrometer to measure the inside of a battery cavity to find out which battery you need.
Headless mode =
Git can be a little intimidating at first because it has the power to change the files you are working on, so it’s good to start with commands that don’t do anything to get a feel for the situation before you actually do something.
git config --list
Shows useful information about the current repository. Shows the remote.origin.url variable for example.
git config --get remote.origin.url
Shows just the url associated with local git repository.
git config --list --show-origin
Probably the most common git command.
To see changes since the last commit. Or
git diff > gitdiff.txt
for a text file of the information.
ls -al ~/.ssh
To check for SSH keys (on Linux only I think).
git log --oneline
Is useful to see all the commits in a row with their commit messages. Or
git log --oneline --decorate --graph --all
for more detailed information.
git log -p filename.py > log.txt
Makes a file with the entire change history of filename. The -p is patch text. This is great for resurrecting “lost portions” of code and replaced the file I used to keep: “unused code.txt”
git branch -v -a
Lists all the branches including remotes, with the current branch highlighted in green plus an asterisk.
git branch --show-current
Shows just the current branch.
git tag -n1
Says to list all the tags and show 1 line of annotation per tag. Default is 0 lines of annotation.
Notice above command to check for existing keys.
The first step is establishing an SSH key on the machine to be connected to GitHub then copy the public key to GitHub. This is a pretty good description of how to do that. Notice Git bash in Linux is just the command line of a Linux machine with Git installed while on Windows you have to open the Git bash executable for a Git-specific terminal.
git clone [github url].git
Notice the format of the remote url determines SSH versus https transfer.
To initialize, navigate to the directory where your code is stored, and:
to initialize git tracking of the directory.
to add files. You can add one at a time to be selective or
? how to add all the files in the directory, then ignore?
This is a pretty good list here, but it lacks informational commands.
git commit -a -m 'commit message here'
Are the daily “save your work” commands.
git mv old-filename.something new-filename.something
To rename a file, use git to rename it instead of renaming it manually. This allows git to track the rename instead of appearing to be “delete and add new.”
git rm filename
To delete a file, use git to allow git to track the deletion. Don’t do it manually or it just shows up missing.
git checkout <commit ID> filename
There are various ways to do this (
revert maybe?) but I did it once like this and it worked. You have to be OK with losing any work in that file since the last commit. The point is it doesn’t affect the other files.
git branch <new-branch-name>
To create a new branch.
git switch <new-branch-name>
To switch to a different branch (same as the still-valid
git checkout <new-branch-name>)
git checkout -b new-branch-name
To create a new local branch and switch to it in one command.
git push --set-upstream origin new-branch-name
? is that right, not just push?
git tag -a v1.0.0 ec595fb -m 'message here'
git push origin v1.0.0
to tag a past commit. Version naming convention is [Major].[Minor].[Patch]
To merge, create a pull request on GitHub, then compare and merge. It’s pretty self-explanatory, THEN to update your local repository:
because you made changes to the GitHub version, but not your local version, so the changes have to be fetched (opposite of push I think?)
git switch main
to switch to the main branch, and you should see a message saying the local main is behind origin/main, then
to pull the commits into the local branch. Merge complete.
git remote -v
lists the remote repositories.
git remote set-url origin firstname.lastname@example.org:rr34/Astro.git
allows you to change the remote url for the origin.
The following are features in GitHub only, not classic command line Git:
The AstroWideImageMapper (AWIM) project aims to enable users to label images of any format – particularly wide-angle – with with pixel-by-pixel directional astronomical coordinate data, i.e. directional azimuth and altitude.
FITS stands for “Flexible Image Transport System.” FITS images are indeed “images” tagged with astronomical data. There are various tools enabling the user to convert among FITS and many other image formats. While FITS images are tagged with flexible astronomical metadata, the quotes around “image” are appropriate. FITS are not strictly images, they are more like observatory data files. From the link above:
“FITS data arrays contain elements which typically represent the values of a physical quantity at some coordinate location. Consequently they need not contain any pixel rendering information in the form of transfer functions, and there is no mechanism for color look-up tables. An application should provide this functionality, either statically using a more or less sophisticated algorithm, or interactively allowing a user various degrees of choice.”
EXIF version 2.32, released in 2019, did not contain azimuth or altitude directional data. All references to altitude are location with respect to sea level, not direction. There is one reference to azimuth, but it refers to the azimuth of GPS satellites received by the camera at snapshot time.
The primary purpose of APT is to help astro-photographers control their cameras with software and plan photo shoots of the stars.
OpenCV is open-source python dealing with image distortion.
Adobe Photoshop has a various tools aimed at image distortion and some of the tools are included in Lightroom as well.
Google Sky is a phone app that enables the user to point the phone in any direction and see a labeled version of the sky in that direction. While Google Sky is impressive, it suffers from receiving its directional data entirely from the phone’s sensors, which can be particularly inaccurate because of azimuth.
Of note, I believe there is another similar app to Google Sky and there are certainly various computer programs with 3-D explorable models of the solar system, galaxy, and even universe to the extent we humans have mapped it.
TawbaWare is used by astro-photgraphers, but primarily focuses on image stitching rather than directional data.
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Decibels are a ratio, just a number to multiply by. While decibels are often shown as a negative value, the ratio is always positive. The ratio can be very tiny or huge, but always positive. For example, 3 decibels means about 2x the power, but -3 decibels means half the power. ‘Drop by 3 decibels’ means power is one-half of what it was. Drop by 90dB is -90dB and means power is one-billionth of what it was. One-billionth is tiny, but still positive.
A decibel is 1/10th of a bel. A bel means “power times 10 to the power __” so a decibel means “power times 10 to the power __ / 10.” Therefore, every 10 decibels is a change by a factor of 10. 10dB is 10x, 20dB is 100x, 30dB is 1000x, -10dB is one-tenth = 0.1, -20dB is one-hundredth = 0.01, -30dB is one-thousandth = 0.001 and so on. Always positive, but ranges from tiny to huge quickly.
Part 3: the “power from physics” part of decibel:
Where the math ‘power’ is the second ‘power’ in the dB description, the first ‘power’ means decibels are assumed to refer to the ratio of power of whatever it is describing. Therefore, don’t try to make physical sense of what a decibel actually is, just know that it means more or less power from any of a variety of other units that describe actual physical phenomena that produce power. Negative decibels means power has diminished (but is still positive). Positive decibels means more power.
The most common example of decibels is to measure sound level. I don’t know what the power reference is for sound decibels, but there must be one and I know the power of 3dB of sound is half the power of 6dB of sound, which is one-tenth the power of 16dB of sound and so on.
Another common example is signal loss in a cable. Since a cable is not powered, these are always “negative decibels,” and usually written as “signal loss per length wire,” which means multiply by something less than one. 3dB per 100 meters of signal loss really means -3dB / 100m and the signal loses about half its power every 100 meters. If the signal travels through 500 meters, it has lost 15dB, which means about 1/32nd of the original power.
How strong is the signal in the air where I am? Since the government wants you to watch TV, the FCC provides this handy tool online:
The FCC’s site uses the unit dBμV/m or “decibel microvolts per meter amplitude” for signal strength. This is really a debacle of a unit. Units like this prevent people from understanding physical concepts, make people hate science in school, and even prevent technicians and probably many engineers from understanding the underlying concepts of their daily work (in my opinion). The proper way to write this unit is “dB (re: 1μV/m)” which means ‘decibels of power relative to a signal of amplitude 1 microvolt per meter.’ The unit “dBμV/m” further explained in 8 steps across two posts:
Step 1: your frustration at the many layers of confusion here are justified. Accept it and move on.
Step 2: Volts per meter. An electric field in the air is measured in volts per meter (V/m). For example, air breaks down at about 3 million V/m, very visible when lightning strikes. You might also say ‘3 megavolts per meter’ or ‘3 MV/m.’
Step 3: Amplitude. Any radio signal generated by an antenna for communication vibrates the electric field in the form of a sine wave at a specified frequency* and amplitude. The amplitude is the maximum at the peak of the sine wave.
*The frequency determines what channel the signal is and must remain within a tight range to not interfere with other signals in the air. Frequency is measured in Hz, MHz, GHz, etc. For example, 88MHz to 108MHz for FM radio. This is separate from the signal strength discussion.
Step 4: μ = micro. Being a Greek letter that looks like a ‘u.’ this is often written with a ‘u.’ It means ‘micro’ which is one millionth, so we are dealing with millionths of volts per meter, i.e. one-trillionth (1 / 1,000,000,000,000) of the unit used to measure air breakdown for lightning.
Step 5: Decibels Explained here.
In our case dB appears in front of μV/m, so you would think you would multiply by 10^(__ / 10) to get the μV/m amplitude of the signal. Nope, see the description of decibels and … in our case here, 100dBμV/m is a common strong signal level for TV stations and it means a signal with a power of 100dB above a signal with 1 μV/m amplitude. 100 dB = 10^(100/10) = ten with ten zeros = 10,000,000,000 = 10 billion. Does that mean 10 billion microvolts per meter or 10,000 V/m??? No. Since the power of a signal is the amplitude squared, the actual amplitude in volts per meter only has to multiply by ten with five zeros to reach 100dB power above a signal of amplitude 1 μV/m, or 100,000 microvolts per meter = 0.1 V/m. Very manageable.
The signal received by an antenna is very weak compared to pretty much all signals powered by electronics on-site. The problem with receiving a weak signal is usually not that the signal is too weak to amplify, but that the noise has to be amplified with the signal and the signal can’t seen over the noise. There is always some level of noise and the signal has to be strong enough to be distinguished from the noise.
Watch Makers 4, Jeff, Instagram @watchmakers4
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