A Sector is a very old tool to graphically lay out proportions with dividers. Based on the principles of similar triangles, it’s mainly used for scaling drawings but can be directly applied to a project if necessary. The tool opens to a wide V where you can, on the Line of Lines, see that the distance between the “6” markings is half the distance between the “12” markings, and the “4” marking separation is a third of the “12” separation. That much is intuitive, useful for scaling a drawing up by say, a third. Quick – how tall is a 7 1/2” drawer front if scaled up by a third? Set your dividers to the height of the front, open the sector so the divider just spans the “9” markings, then open your dividers to span the “12”. No math involved, and mathematicians were scarce in the 17th century.
There is also a scale labeled “Line of Circles”. It has markings for “Radius”, Diameter”, and “Circumference”. These are also intuitive proportions. Diameter = 2 X Radius and Circumference = Pi X Diameter. Linear relationships.
8-6-2021 (August 6, 2021) is the Snakiest day of the year and it’s also this year’s CircuitPython Day! The day highlights all things CircuitPython and Python on Hardware. See you there!
Stop breadboarding and soldering – start making immediately! Adafruit’s Circuit Playground is jam-packed with LEDs, sensors, buttons, alligator clip pads and more. Build projects with Circuit Playground in a few minutes with the drag-and-drop MakeCode programming site, learn computer science using the CS Discoveries class on code.org, jump into CircuitPython to learn Python and hardware together, TinyGO, or even use the Arduino IDE. Circuit Playground Express is the newest and best Circuit Playground board, with support for CircuitPython, MakeCode, and Arduino. It has a powerful processor, 10 NeoPixels, mini speaker, InfraRed receive and transmit, two buttons, a switch, 14 alligator clip pads, and lots of sensors: capacitive touch, IR proximity, temperature, light, motion and sound. A whole wide world of electronics and coding is waiting for you, and it fits in the palm of your hand.