Constant bearing Sea story: A sailor was a passenger in a taxi cab when he saw that another car was about to collide. He yelled out, but the driver didn't act to his warning of "Zero Bearing Drift."
Those disk calculators always amaze me. There are lots of different ones for different purposes. And while they appear so primitive, they are extremely useful and save a lot of work and time. Same is true for the slide rule, the pocket calculator of the pre-electronic age. Engineers used to build airplanes and bridges and whatever else, by using those things. And they dont even need batteries...
Most of them are either simple linear scales for addition or log-log scales for doing multiplication. log(ab) = log(a) + log(b) lod(a/b) = log(a) - log(b) The declination correction uses linear scales to add subtract differences of declination. The back of course corrector is a normal circular log-log slide rule for rate×time=distance calculations.
@@timharig Yes, but still ingenious. It simplifies repetitive specific calculations, has no need for large lists of certain values, and reduces the risk of making mistakes. And all for $1 production cost.
I still use a variant of a slide rule as a UK electrician to calculate volt drop, because it's just way quicker... 'size of cable, length of cable, current' BAM, read off on the cursor
@@timharig don't forget the trig and exponential functions on most slide rules as well. Those would be a right pain to do by hand. Much like nomograms, slide rules can be constructed for any function of one or two variables.
I’m in the Coast Guard and actually have used the speed distance calculator even as recently as last summer. It’s a quick and easy way to get a time when you need it. As for compas corrections it’s still important even with Gyroscopic compasses and GPS. The deviation tables actually have to be done by someone certified. I have always used TVMDC for compass corrections True Variation Magnetic Deviation Compass And the phrase East is Least West is best (subtract east error and add west error) To remember it we said True Virgins Make Dull Company There is another type of maneuvering board for plotting radar positions as well. As always, great video. Thanks
On a yomp across Dartmoor I noticed that I always had the same deviation from the officers compass bearing. Now we were all a bit green but I noticed he had his compass on a clipboard. During a broken 'smoko' I asked him for the compass and took my bearing which did not agree with his and I knew why. His clipboard had a metal clip and that skewed his readings by several degrees port. He must have discovered this as he placed the compass back on the clipboard and then chose to stow it elsewhere. True course acquired and adjusted to pass (or not ) a Pub on the way back to the ship. 1982 HMS Raleigh.
The mnemonic we use in aviation to go from True to Compass is "True Virgins Make Dull Company (add Whiskey)." That gives you the order of True, Variation, Magnetic, Deviation, and Compass. The "add Whiskey" is a reminder to add westerly variation/deviation. You, of course, subtract when going the other way.
have you done flight computers yet? I have my uncles flight computer he had with him during operation linebacker. I was always interested in it growing up, he kept it between two books on a book shelf then when i was getting my private pilots license he told me if i could show him i knew how to use it he would give it to me. less than 3 months later it was mine and yes I do use it.
Aviators still use those today - the old trusty E6B aviation calculator with wind correction device on the back. While a lot of it has gotten electronic, the calculations the computer does are the same, just less tedium an error and are easier to visualize. But many people still do it the old school method because it's a useful backup when the electronics go out or are bounding around in turbulence and have difficulty hitting buttons
As a slide rule collector I have a number of nautical slide rules, and most of them are the simple speed/distance/time, though some also have the ability to calculate between D Long and Departure by means of a trig scale on the back that can be used to set the middle latitude - having set this, the distance/time scales can then be used for the conversion. I was still able to buy a new speed/dist/time circular rule from a US company a couple of years ago, so they still seem to make them. Aviation rules are more interesting - there are quite a few cold-war era Soviet and Warsaw pact ones that are readily available and have a variety of interesting scales (e.g. corrections for speed and altitude), though I'm not sure what they're all for.
Compensating for variation and deviation aren't enough to determine true course. That just tells you the direction the vessel is pointed. To get a true course, you need to compensate for drift from current and wind. Also, at 10:19 "a nautical mile is 1.508 times longer than a statute mile" is incorrect - A nautical mile is 1.1508 times the length of a statute mile.
Please, oh _please_ edit your comment to correct the word 'inept' to whatever it was you actually meant to say. (I refuse to believe that you intended to describe Gilles' delving to be 'inept').
My apologies, I meant to state in-depth. the whole statement should have been:" I love your channels and how in-depth you delve into each topic. Maybe you could do a episode on magnetic mines, used in WWII.. Thanks"
Great show. I have a 1964 megger in perfect unused condition. It has a winding handle to generate the voltage required. Perhaps you might examine such an instrument and share it with the class? Regards Guy
furst thanks for the interesting work. You asked gor more devices, I have a few.. repeating circle was very important for the start of truly accurate mapping of the workd, followed by other more advanced like transits then theodolite and now almost completely replaced by electronic devices. bubble sextants used in air navigation and the periscopic sextants used until few decades ago (sometimes more recently than that in military planes) Navigational sliderules like the Bygrave and the german "Höhenrechenschieber" used to quickly solve the spherical PZX triangle when navigating by celestial objects using a sextant then you have very simple thjngs like log lines and lead lines, both vital to navigation at times until surprisingly recently. how abiut charts and maps for clmplicated mechanical equipment, how about gyro compasses and inertial navigation devices.
You should do a video on the Rude 2102-D Star Finder. Mine was made by Weems & Plath. You can demonstrate how, by using values from the Nautical Almanac, it can also find planets. If you haven't already, you might consider a series of videos on the E6-B Flight Computer. Maybe one video for the circular sliderule and a second video for the wind face.
Something tells me that E6B is coming up on your channel. Anyway, another use of alidade, not for moving navigation but intersecting your firefighting penchant, is inside fire watch towers, to precisely determine the direction of a distant fire.
Gilles I would like to see a Stadimeter being described. I have a lovely fully restored and complete 1942 US Naval version. Of course even by 1942, radar was making these instruments redundant.
There is another version which has a linear sliderule thing attached to the disk and some additional scales on the speed calculation side. These are for converting latitude and longitude to miles and back and a few other common calculations. I don't know what is used for which.
The back of the course corrector is nothing more than a normal log-log slide rule. It can be used to do any kind of multiplication operation. Log(ab) = log(a) + log(b)
It’s 100% Pelōrus, so your accent is on the “O.” It’s a Latinized version of a Greek name, Peloros, and so looking in a couple of Latin dictionaries you’ll see that the “O” is long and thus takes the accent. In Greek, the accent is in the same place.
I was about halfway through the video when it stopped, but luckily this one was finished uploading, and I remembered the time I was at on the other video.
[1:52] Bearings relative to the current course? Not quite exactly, I think: relative to midships, OK, but if a current offsets you, that is not identical.
I worked in the Navigation business33 years, It is pronounced "Pel-lor- us". one of you early pictures is of a telescopic alidade not a pelorus ring or a bearing circle.
England. I have a RAF sextant - it doesn't need the horizon - do you know why ? It works but all I can say is Gawd knows where their eyeballs were. Pity about the adverts in the middle.
Sextant for air/ground use typically use a bubble like the one inside spirit level as an artificial horizon. Aviation sextants are probably designed specifically to use an artificial horizon; but, you can artificial horizons to work with regular naval sextants. Alternatively, when using a sextant on land, you can use dish of liquid and measure between a celestial object and its reflection on the surface of the liquid. Divide by two to get your ascension.
True north +/ - Magnetic Varition, +/- Magnetic Deviation = compass , and forget CADET. something much more memorable? T- ierd V-irgnis M-ake D-ull C-ompany. Which would a bynuch of youg male cadets be likley to remember?😆
![OsamaSon - ik what you did last summer [Official Music Video]](http://i.ytimg.com/vi/4DIQDnu3mr4/mqdefault.jpg)
Constant bearing Sea story: A sailor was a passenger in a taxi cab when he saw that another car was about to collide. He yelled out, but the driver didn't act to his warning of "Zero Bearing Drift."
The "navigator balls... Giggity!" Cracked me up😂
"Fnaar, fnaar!" in British English. ;-)
Teacher: ok class, what have you learned from this video?
Class: Giggity.
You should an episode on the E6B aviation navigation computer
Yeah, I feel like that would be right up his alley.
Those disk calculators always amaze me. There are lots of different ones for different purposes. And while they appear so primitive, they are extremely useful and save a lot of work and time. Same is true for the slide rule, the pocket calculator of the pre-electronic age. Engineers used to build airplanes and bridges and whatever else, by using those things. And they dont even need batteries...
Most of them are either simple linear scales for addition or log-log scales for doing multiplication.
log(ab) = log(a) + log(b)
lod(a/b) = log(a) - log(b)
The declination correction uses linear scales to add subtract differences of declination. The back of course corrector is a normal circular log-log slide rule for rate×time=distance calculations.
@@timharig Yes, but still ingenious. It simplifies repetitive specific calculations, has no need for large lists of certain values, and reduces the risk of making mistakes. And all for $1 production cost.
I still use a variant of a slide rule as a UK electrician to calculate volt drop, because it's just way quicker... 'size of cable, length of cable, current' BAM, read off on the cursor
(oh yes and it's a disk, hence me mentioning it)
@@timharig don't forget the trig and exponential functions on most slide rules as well. Those would be a right pain to do by hand.
Much like nomograms, slide rules can be constructed for any function of one or two variables.
I’m in the Coast Guard and actually have used the speed distance calculator even as recently as last summer. It’s a quick and easy way to get a time when you need it.
As for compas corrections it’s still important even with Gyroscopic compasses and GPS. The deviation tables actually have to be done by someone certified.
I have always used TVMDC for compass corrections
True
Variation
Magnetic
Deviation
Compass
And the phrase East is Least West is best (subtract east error and add west error)
To remember it we said True Virgins Make Dull Company
There is another type of maneuvering board for plotting radar positions as well.
As always, great video. Thanks
SEMPER PARATUS...👍
On a yomp across Dartmoor I noticed that I always had the same deviation from the officers compass bearing. Now we were all a bit green but I noticed he had his compass on a clipboard. During a broken 'smoko' I asked him for the compass and took my bearing which did not agree with his and I knew why. His clipboard had a metal clip and that skewed his readings by several degrees port. He must have discovered this as he placed the compass back on the clipboard and then chose to stow it elsewhere. True course acquired and adjusted to pass (or not ) a Pub on the way back to the ship. 1982 HMS Raleigh.
The mnemonic we use in aviation to go from True to Compass is "True Virgins Make Dull Company (add Whiskey)."
That gives you the order of True, Variation, Magnetic, Deviation, and Compass. The "add Whiskey" is a reminder to add westerly variation/deviation. You, of course, subtract when going the other way.
have you done flight computers yet? I have my uncles flight computer he had with him during operation linebacker. I was always interested in it growing up, he kept it between two books on a book shelf then when i was getting my private pilots license he told me if i could show him i knew how to use it he would give it to me. less than 3 months later it was mine and yes I do use it.
I thoroughly enjoy each and every one of your videos. The entertaining skit at the beginning is just the cherry on top.
I used to be a professional maritime Navi-guesser, so I like this stuff!
Hahahaha I cackled at the intro. You're getting really good at this man 😂 love from the Maritimes!
I love cameras and navigational instruments....... YOU CAN RENAME THE CHANNEL ANY TIME 🙂🙃😊😍
There you go again….making everyone a little smarter and looking sharp while you do it!
Aviators still use those today - the old trusty E6B aviation calculator with wind correction device on the back. While a lot of it has gotten electronic, the calculations the computer does are the same, just less tedium an error and are easier to visualize. But many people still do it the old school method because it's a useful backup when the electronics go out or are bounding around in turbulence and have difficulty hitting buttons
Ok ok, that giggety got me. Chocolate Frosty out my nose.
As a slide rule collector I have a number of nautical slide rules, and most of them are the simple speed/distance/time, though some also have the ability to calculate between D Long and Departure by means of a trig scale on the back that can be used to set the middle latitude - having set this, the distance/time scales can then be used for the conversion.
I was still able to buy a new speed/dist/time circular rule from a US company a couple of years ago, so they still seem to make them.
Aviation rules are more interesting - there are quite a few cold-war era Soviet and Warsaw pact ones that are readily available and have a variety of interesting scales (e.g. corrections for speed and altitude), though I'm not sure what they're all for.
Compensating for variation and deviation aren't enough to determine true course. That just tells you the direction the vessel is pointed. To get a true course, you need to compensate for drift from current and wind.
Also, at 10:19 "a nautical mile is 1.508 times longer than a statute mile" is incorrect - A nautical mile is 1.1508 times the length of a statute mile.
3:44 That was a nice fade/transition
Episode suggestion: the Pip-Squeak system used by the RAF in WW2.
I love your channels and how inept you delve into each topic. May be you could do a episode on magnetic mines, used in WWII.. Thanks
Please, oh _please_ edit your comment to correct the word 'inept' to whatever it was you actually meant to say. (I refuse to believe that you intended to describe Gilles' delving to be 'inept').
My apologies, I meant to state in-depth. the whole statement should have been:" I love your channels and how in-depth you delve into each topic. Maybe you could do a episode on magnetic mines, used in WWII.. Thanks"
This is so similar to an E6B flight computer! Of course, both nautical and aerial navigation use the same principles.
That Lord Kelvin -he had some balls!
I'd still like to see a video on the history of blow torches (lower left shelf, viewers perspective).
Great show. I have a 1964 megger in perfect unused condition.
It has a winding handle to generate the voltage required.
Perhaps you might examine such an instrument and share it with the class?
Regards Guy
furst thanks for the interesting work.
You asked gor more devices, I have a few..
repeating circle was very important for the start of truly accurate mapping of the workd, followed by other more advanced like transits then theodolite and now almost completely replaced by electronic devices.
bubble sextants used in air navigation and the periscopic sextants used until few decades ago (sometimes more recently than that in military planes)
Navigational sliderules like the Bygrave and the german "Höhenrechenschieber" used to quickly solve the spherical PZX triangle when navigating by celestial objects using a sextant
then you have very simple thjngs like log lines and lead lines, both vital to navigation at times until surprisingly recently.
how abiut charts and maps
for clmplicated mechanical equipment, how about gyro compasses and inertial navigation devices.
You should do a video on the Rude 2102-D Star Finder. Mine was made by Weems & Plath. You can demonstrate how, by using values from the Nautical Almanac, it can also find planets.
If you haven't already, you might consider a series of videos on the E6-B Flight Computer. Maybe one video for the circular sliderule and a second video for the wind face.
I learned all this before we had GPS.
Now that we have it, I couldn't be bothered.
Something tells me that E6B is coming up on your channel. Anyway, another use of alidade, not for moving navigation but intersecting your firefighting penchant, is inside fire watch towers, to precisely determine the direction of a distant fire.
more electronic devices would be interested
Gilles I would like to see a Stadimeter being described. I have a lovely fully restored and complete 1942 US Naval version. Of course even by 1942, radar was making these instruments redundant.
Love the random knowledge bits
Gille, maybe you could do a video on Compass correction by azimuth or amplitude of the sun.
Great video, Gilles...👍
Always interesting. Thanks
Well now i feel you have to cover the E6B
There is another version which has a linear sliderule thing attached to the disk and some additional scales on the speed calculation side. These are for converting latitude and longitude to miles and back and a few other common calculations. I don't know what is used for which.
That's a lot like the E6B flight computer I got while taking flying lessons.
Ya know, I wasn't thinking that about your channel's name...I was thinking: "Who else gets confused by a sentence like: 'Let Us eat Lettuce.'
[next week, Gilles raids Clickspring and then reviews the Antikythera mechanism]
Gilles, love your intros :D
6:34 Nice!
This can be renamed to Technology Junctions.
Magnetic North getting closer to Siberia sounds a bit ominous.
That "giggity" absolutely broke me
The back of the course corrector is nothing more than a normal log-log slide rule. It can be used to do any kind of multiplication operation.
Log(ab) = log(a) + log(b)
So that's a ship's navigation. Are we going to get the E6B computer for pilots next?
Unexpected Giggity
It’s 100% Pelōrus, so your accent is on the “O.” It’s a Latinized version of a Greek name, Peloros, and so looking in a couple of Latin dictionaries you’ll see that the “O” is long and thus takes the accent. In Greek, the accent is in the same place.
I like the "Unprofessional driver on public street". They push no texting and driving. totally okay to find your course however!
What happened to the other video?
For like an hour I couldn't even find this video. I dunno if he was editing channel or if a RUclips fuckup
Original video have issues so he re-upload yes.
I was about halfway through the video when it stopped, but luckily this one was finished uploading, and I remembered the time I was at on the other video.
I had to skip back to assure myself I didn't imagine that giggidy.
[1:52] Bearings relative to the current course? Not quite exactly, I think: relative to midships, OK, but if a current offsets you, that is not identical.
Surveyor's Mantra: Angular Error Propagates Over Distance
Have you done WW II aircraft sextants, octane and magneticless compass?
I worked in the Navigation business33 years, It is pronounced "Pel-lor- us". one of you early pictures is of a telescopic alidade not a pelorus ring or a bearing circle.
shout out from flushing new york
Your 'giggity's are the best.
Why the reupload? I didn't detect anything strange the first time!
England. I have a RAF sextant - it doesn't need the horizon - do you know why ? It works but all I can say is Gawd knows where their eyeballs were. Pity about the adverts in the middle.
Sextant for air/ground use typically use a bubble like the one inside spirit level as an artificial horizon. Aviation sextants are probably designed specifically to use an artificial horizon; but, you can artificial horizons to work with regular naval sextants. Alternatively, when using a sextant on land, you can use dish of liquid and measure between a celestial object and its reflection on the surface of the liquid. Divide by two to get your ascension.
Well, it's obvious that he wants to snap-shot his course!😀
👍
#41, row well ; and live.
“Helm to 108!”
Now I'm the first one here!
But I'm having some serious deja vu:)
Hello again ......
Where is your bow tie?
It's the weekend, it is perfectly fine to relax a bit and substitute an ascot for the bow tie.
True north +/ - Magnetic Varition, +/- Magnetic Deviation = compass , and forget CADET. something much more memorable? T- ierd V-irgnis M-ake D-ull C-ompany. Which would a bynuch of youg male cadets be likley to remember?😆
A nautical mile is 1.15078 x longer than a statute mile Not 1.508.
I'm lost...
Sorry no audio
Client side issue.
BCE ? Oh no they got to you too.
1 nm = 1.1508 miles. You left out the one.
Giggerty 😂😂
Renaming the channel to that would be way too long
giggity
Unprofessional Driver!
Intros just keep getting better and better. 😆
LOL
An alternative mnemonic, Can Dead Men Vote Twice.
Only in Chicago
..they consistently vote MORE than once...
I learnt Tierd Virgins Make Dull Company. 🤣
Using the term BCE loses my subscription.
Don't be such a snowflake.
@@charliem989Aww... poor little snowflake calls me a snowflake 'cause he hates Jesus. Sniff...
@@charliem989Awww. Snowflake calls me a snowflake 'cause he don't like Jesus. :)
Why?
FALT EARTH!!!!!
6:34 WTF? Brilliant!
Episode suggestion: the Pip-Squeak system used by the RAF in WW2.