Wow, been a long time since I thought about a split bubble level. Thanks for the reminder! I love vintage instruments!

Simple, well expressed informative. Excellent. I wish more YT information videos were presented with this degree of focus on the message, rather than the presenter.

I leveled for 6 weeks straight for control on a project in Denver in the middle of winter. Good stuff.

Thanks for your responses for our survey.. From Iraq 🇮🇶🇮🇶🙏🖤

Great explanations for a newbie like myself! Looking forward to more videos explaining currently how surveying is done!!! 👍

In the UK, we call the horizontal plane swept out by the instrument "the plane of collimation" and, of course, we don't use staves in foot/inch measurements but the normal metric "E" staff in which each "E" is 50mm high with 10mm thickness of the three arms of the "E". The next 50mm is three blocks of 10mm depth, spaced 10mm apart. The whole thing is then repeated on the next 100mm or 1/10 of a metre. Then the metre figure is marked and in the next metre, the "E"s are on the other side of staff face and so on.

Excellent information. You have that great story telling, book reading, documentary narrating voice!

Calibrated, older style dumpy levels can be just as accurate in the field for measuring elevations as automatic levels. Automatic levels though take much of the human error out of the picture, as the compensator has a big working range that keeps the hz line of sight true. The part of your video where you're showing the circular bubble moving straight back and forth in and out of the bullseye is how you test the repeatability of a compensator to maintain a level line of sight. So, when an operator is using one of these instruments in the field, if the compensator is working and repeating as it should, typically anywhere within the bullseye is level enough. The compensator does have limits, but they are typically way outside the bullseye straight back and forth as again you showed on your video. So, the ease of use is a big reason why they are so accurate in the field as they eliminate much of the human error you would have with leveling error associated with traditional dumpy-type levels. The difference in accuracy is huge between a circular bubble on an automatic level and a higher precision vial on a dumpy level. But, the automatic level bubble only has to be so accurate as the all the leveling accuracy of the instrument is delivered through the function of the compensator. A dumpy level vial like the one in your video is like a 20-30 second bubble which of course translates to how level the instrument is in actually 4 directions, not just 2. And, of course this translates to the dumpy levels accuracy for measuring elevations. Both instruments are calibrated to repeat within a few arc seconds in a survey instrument repair shop's collimator. The automatic level though simply through it's design and ease of use delivers more consistent accuracy over the long run. It's still the gold standard for measuring elevations in the field at +/- 1/32" per 100 ft., with a calibrated instrument. Laser levels are more like +/- 1/8" per 100', and have some operator error introduced into the picture with how the operator goes about using the laser receiver.

Sir i dont know you but i am very much thankful to you as during my graduation time no one taught us about levelling the way you taught amazing short and valuable videos thankyou sir for making such nice videos thanks alot once again

Long distance leveling is a lot like banging your head against a wall. It feels so good when you stop! Great video thanks👍🇿🇦

This is the best video on explaining this topic

There is only one comment I have to make. When Todd is explaining rise/run, he suggests a layman should measure the distance between the two points. If the is measured along the ground, it would be the hypotenuse of the triangle. It must be the horizontal distance, aka the run. An example of this, if you have a 45 degree slope and measure the slope distance between two points, say 100 feet apart horizontally, you will measure 141 feet, the sine or cosine of 45 degrees along the slope. Other than this, this was a good video. Please note, that land surveyors measure the horizontal distances for land surveys, therefore, you could call them “flat-earthers”.

You are so much better than my lecturer, thank you so much

Did I just become a surveyor? This video was great, thank you!

Great video, very well explained! Thanks for putting this together...thanks from Canada...

Thank you for a very informative video! You have a talent for teaching.

It was a good one for a beginner and easy to understand,

Thanks for the wonderful, instructional video

Highly informative video. thank you for sharing

Very well made video with a ton of useful information thank you.

Dear Tod Sir ... thank you & in the hindsight the Surveyors Association. KZfaq can't be better than this. A similar uploads on "Total Stations" would be helpful. GBU Sir !!.

If you plot a plane that’s perfectly perpendicular to plumb on the shore of a 10 mile wide lake. How much will the center of the water deviate from the objectively level plane?

This is good I'm a student at IUEA in Kampala Uganda but we miss these instruments I would prefer in my Field I use a leather theodolilte.

good demonstration there sir

Thanks Mr. Tod. It's very helpful.

1:29 *insert Rick and Morty joke here

Thank you for these supurb set if videos. Regards.

i have to admit, humans are quite ingenious, in creating these complex things, arent we?

Very good information sir

Thank you for your time sir

Very nice video. Well done!

Great video on surveying.

thanks very informative god bless you

Surveying produces a level line Keywords: Theodolite or transit

1:29 More specifically it is a spirit level.

Awesome explanation. I was always curious and you were able to explain it very well. Thanks.

Very Informative! Thank you.

Very informative video. Thank you! Any thoughts of making how to calculate angles with theodolite?

Great job. Thanks for posting.

great channel

Nice tutorial. I like to share my thoughts ... who knows who can add to my experience about the world of construction out there

Great, Thank you so much Tod.

Really super 👌

Thank you

This Is very informal and helping me thank you. Cant help to say that you sound like Ron from Parks and Rec Netflix series lol. Good work

only joking. loved the vid. reminded me of my college days in 1986, when i studies civil engineering.

Hi Very good explanation...............

TQ sharing

thanks dear sir for your best information

Very informative, thanks

Thank you for the information.. can u make a video about total stations,like transfering data to usb then to excel

Nothing is 100% perfect in this world but errors must not be fatal even when they are accomulated yet again all professional errors must be field specific depending on what you are measuring and for that purpose (negligible error).

thank you Sr for the video.

That is so interesting, very helpful

The Earth's curvature is never figured in so why do people think it's curvatured?

Thanks very much So how long you get your certificate or Diploma

Dude's barber obviously use a laser level to provide a razor sharp haircut!

Thankyou helped a lot!

thank you

well teaching

Thank you for the good information :)

hi working with that level is good or new horizontal leser level with remod

wonderfull

Good video.

Thank you!

Thank you po

how to convert different higher and lower level reading to one station?

Cool video ❤❤

Thanks!

So, level is horizontal. 3:12 3:37-so horizontal is gravity? Why not just say perpendicular to horizontal? 7:30- so if you can extend the horizontal line, at which point does one differentiate between elevation and earth curve?

Now tell us how you figure out the Earth's curvature

Thank you for a good information :)

Thanks very good

Nice to hear someone explain this without Lamb Vindaloo in their mouth.

Expertise your knowledge of engineering here

Great

Would you kindly do a video of measuring the curvature of the Earth, to put the flat Earth theory to rest.. I posit that could be done with two theodolites. The second, place at a distance acceptable for the optics and accuracy, would have it's orifice centered by the first theodolite. The second shooting back at the first should strike above the orifice of the first by double the calculated curvature, which is 1.5 thousandths of an inch per linear foot distance. The curvature would be quite easy to see as this method would accurately double the measurement. Thank you from New Zealand.

How to book & check precise leveling

0:15 That one beard hair...

ăn tết vui vẻ nha

i think he's an iphone guy...... how i knew??... HE'S GOT THE NOTCH...

What is name of this tool?

Hey can i ask u a question

2:55- why is that?

I love to join this firm, give me a chance

Why 848.86?

You say at the start that measuring the horizontal distance is "easy" and one can use a tape measure. How is it easy to measure the horizontal distance, of say, 100m with a tape measure? I would say that was impossible.

The Earth is flat water don't lie. People do

Flat the earth is...

boring

Thank you sir

Thank you