Talk:Vernier scale

External Links

http://www.phy.ntnu.edu.tw/ntnujava/htmltag.php?code=users.sgeducation.lookang.AAPTVernierCaliper_pkg.AAPTVernierCaliperApplet.class&name=AAPTVernierCaliper&muid=14019 can someone check if this link is acceptable? it is definitely better than http://members.shaw.ca/ron.blond/Vern.APPLET/ i feel.

http://members.shaw.ca/ron.blond/Vern.APPLET/ is down This webpage is not available The connection to members.shaw.ca was interrupted. Here are some suggestions: Reload this webpage later. Check your Internet connection. Restart any router, modem, or other network devices you may be using. Add Google Chrome as a permitted program in your firewall's or antivirus software's settings. If it is already a permitted program, try deleting it from the list of permitted programs and adding it again. If you use a proxy server, check your proxy settings or contact your network administrator to make sure the proxy server is working. If you don't believe you should be using a proxy server, adjust your proxy settings: Go to the wrench menu > Options > Under the Hood > Change proxy settings... > LAN Settings and deselect the "Use a proxy server for your LAN" checkbox. Error 101 (net::ERR_CONNECTION_RESET): The connection was reset.

(Lookang (talk) 15:06, 13 August 2011 (UTC)).

Older Image

A set of vernier calipers.

I have replaced this image with better quality ones from German wikipedia which have a greater explanatory value. Lumos3 23:03, 30 May 2005 (UTC)

Vernier scale on a slide rule?

I have never come across this and the Slide rule article makes no mention of it. I think it should be deleted. Lumos3 08:38, 13 Jun 2005 (UTC)

see: http://sliderulemuseum.com/Patents/US/2424713.pdf 99.199.121.190 (talk) 17:50, 26 February 2011 (UTC)

True,it uses a vernier on the non logarithmic of the slide rule. Was it just a patent or was it ever manufactured. Lumos3 (talk) 23:57, 26 February 2011 (UTC)

It wouldn't make much sense; a vernier would only work against a linear scale and there's usually only one linear scale on a slide rule; the rest are logarithmic scales.

Atlant 12:26, 13 Jun 2005 (UTC)

Replaced slide rule by theodolite as an example. Lumos3 13:24, 13 Jun 2005 (UTC)

linear scale, zero point

linear vs logarithmic, not linear vs angular. this should be clarified

I don't understand how the zero point of the vernier/indicating scale is coincident with the start of the data scale. It is coincident with the index of the "slider".

I have added some clarifications to the article which I hope explains things. Please come back if its not clear as this dialogue can only improve the article for new readers. Lumos3 13:22, 24 September 2005 (UTC)

Logarithmic?: On a slid rule you use logarithmic marks, but even on an angular scale (ie precision goniometer) the marks are still liniar around the curved slipline. The Vernier scale is also liniar, only off by a constant ratio to give the next fractional digit.
Zero point?: Obviously, by definition, when the instrument is closed and empty, the start (zero point) of the Vernier scale must be coincident with the zero point of the main scale. However, it is not necessary for there to be any particular relationship of the marks with the jaw contact faces (althouth there are practical considerations). If you had a caliper with unmarked surfaces, you could use any needle to scratch a random perpendicular line across the (jaw closed) slipline, and call that zero, then use that scratch to lay out the precision liniar main and Vernier scales.

Perhaps it is also worth noting that at Zero (or any exact alignment of the vernier 0 with a main scale mark, the Vernier end (9 or 11) mark is also aligned. This double alighment is also one indication of scale quality (If four marks don't align everywhere, don't buy it!)

A Vernier scale also makes it easier to guess at another additional decimal of precision with reasonable accuracy, as you can see when none of the marks align, the true measure is between the two vernier marks that are enclosed by (or enclose) 2 marks on the main scale. It is easy to see how 'balanced' that enclosure is, and therby to estimate the next digit.
--Wikidity (talk) 07:26, 1 March 2012 (UTC)

Misreading?

On the closup picture (with the 2 red markings), you can see that on the vernier scale, the line that matches up exactly, is the ",6" line and not the ",58" one.

So the measurment should be 3,6 mm and not 3,58 mm.

Unless with "closest alignment" is really meant that one that comes the closest, but doesn't line up exactly. (Which is what I learned).

Vernier scales are hard enough to read in real life; the only person who could say with any certainty which mark lined up is the photographer at the time of the photograph. Parallax error for the win. - Toastydeath 02:02, 6 September 2006 (UTC)

I Have added a note to this effect. This is also noted on the German article. Lumos3 09:23, 28 October 2006 (UTC)

Inventor's Name

The inventor is Pierre Vernier not Augustus Vernier (that is how he is called in his native village Ornans (25) where the main street is named after him) —Preceding unsigned comment added by Vernier (talk • contribs) 20:54, 13 September 2007 (UTC)

Capitalization

Shouldn't "vernier" be capitalized because it's named after a person? Wizard191 (talk) 02:23, 4 May 2009 (UTC)

JIF image

The image showing a retrograde vernier is really a direct reading vernier.Redding7 (talk) 15:46, 9 November 2011 (UTC)