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8 Oct 2012 An additional scale on the proportional dividers makes it easy to divide the circumference of a circle into even segments. First, with the dividers closed, loosen the thumb screw and move the pivot until the scribed line aligns with the number on the Circle scale which corresponds to the number of segments. Proportional Dividers to Transfer Drawing Scale or Equally Divide Lines & Circles. A proportional divider is an instrument used by artist and draftsman to maintain scale ratio when transferring design elements from a 3 dimensional object, drawing, or photo to another surface. 19 May 2014 Proportional dividers are really super handy when studying lines most basic (and cheaply made) of manual drafting instruments any more.Proportional dividers help transfer measurements to ensure a consistent scale. Twist the thumb nut in the center of the proportional divider to the left to loosen. Slide the nut up and down to adjust the scale. Numbers on the side of the proportional divider, just above the thumb nut, indicate the different scales. The Bate Collection was given a pair of proportional dividers as part of the Chanot family violin making tools. These measuring tools are used in a similar way to 2 Nov 2017 45.132X Figure 2-22.-Proportional dividers. bar called a beam. The slide-mounted attachments can be locked in any desired position on the beam. Thus This little known drawing guide is a great little tool for beginners and pro's, the proportional divider and how to use it!