June 7th, 2018, 01:02 AM  #1 
Newbie Joined: Jun 2018 From: Norway Posts: 2 Thanks: 0  Constant angle protractor?
Is there a protractor/compass that keeps a constant angle where one arm automatically moves the other arm? Say the protractor is closed at a 0 degree angle, you move one arm and the arm follows exactly opposite to it on the other side? Protractor.jpg 
June 7th, 2018, 01:35 AM  #2 
Global Moderator Joined: Dec 2006 Posts: 19,291 Thanks: 1683 
I doubt it.

June 7th, 2018, 02:00 AM  #3 
Newbie Joined: Jun 2018 From: Norway Posts: 2 Thanks: 0 
Mmm, there must be something like this, if not a geometry tool 
June 7th, 2018, 03:49 AM  #4 
Global Moderator Joined: Dec 2006 Posts: 19,291 Thanks: 1683 
Various adjustable linkages exist, so perhaps there's one that would do what you want if set up correctly.

June 7th, 2018, 06:42 AM  #5 
Senior Member Joined: Apr 2014 From: UK Posts: 878 Thanks: 319 
You want one of these: https://image.dhgate.com/0x0/f2/albu...PYXpbhA857.jpg 
June 7th, 2018, 06:49 AM  #6 
Senior Member Joined: Apr 2014 From: UK Posts: 878 Thanks: 319 
If you attach a piece of cork to the end and point a laser distance measuring device at it, you can read off the angle 
June 7th, 2018, 06:58 AM  #7  
Senior Member Joined: Jun 2015 From: England Posts: 844 Thanks: 252  Quote:
The simplest ones are just two arms like you show with a large locking wingnut at the pivot so you can set the angle. Equally my adjustable draughtsman's square has this ability.  
June 7th, 2018, 09:46 AM  #8 
Global Moderator Joined: Dec 2006 Posts: 19,291 Thanks: 1683 
What causes the arms to move in opposite directions?

June 7th, 2018, 11:31 AM  #9 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,842 Thanks: 1068 Math Focus: Elementary mathematics and beyond 
Build one and patent it, then see how well it does.


Tags 
angle, constant, protractor 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
Prove analytic function is constant, if argument is constant  ag07  Complex Analysis  6  December 4th, 2015 07:05 PM 
A set square with integrated protractor  MBRuler  Math Software  0  November 17th, 2013 05:55 AM 
The Protractor  Its Construction  long_quach  Algebra  5  April 21st, 2013 05:53 AM 
iOS App Recommendation:3D Protractor  songrotek  Math Software  0  January 27th, 2013 06:53 PM 
iOS App Recommendation:3D Protractor  songrotek  Algebra  0  December 31st, 1969 04:00 PM 