Bow compasses should be used on all arcs and circles having a radius of less than 3/4 inch.
For drawing straight lines and curves that are not arcs of circles, the ruling pen is used. The distance…
For larger circles beam compasses are used. The two parts called channels which carry the pen and the…
Circle pattern exercise: Draw diagonals A C and D B, and with the T-square draw the line E H. Now mark…
Adjusting the needle point so that it is slightly longer than that of the pencil.
In changing the compass from a small to large radius, hold the legs together with one hand and spin…
Always draw a circle in one stroke, inclining the compass in the direction of the line and rolling the…
"Section of a Hen's Egg before Incubation. a, yolk, showing concentric layers; a', its semi-fluid center;…
Types of vascular bundles: "A, the concentric type, with xylem, k, surrounding the phloem, h." -Stevens,…
"Showing concentric and eccentric striations of starch grains. e, potato starch eccentrically striated;…
Illustration showing the definition of a circle as a conic section. The section of a right circular…
Illustration showing a circle with a radius of 2 in. intersecting a circle with a radius of 3 in..
"A circle may be considered as made up of triangles whose bases form the circumference, and whose altitude…
An illustration of a circle inscribed in a square. It can be used to show that the area of a circle…
An illustration of an arc of a circle. An arc is any part of the circumference of a circle.
An illustration showing the intersection of a plane and a cone. The cone is intersected by a plane parallel…
An illustration showing how to find the center of a circle which will pass through three given points…
An illustration showing how to construct a tangent to a circle through a given point in a circumference.…
An illustration showing how to construct a tangent to a circle through a given point outside of a circumference.…
An illustration showing how to construct a tangent circle to a circle with a given radius. "Through…
An illustration showing how to construct a tangent circle to 2 given circles. "Join centers C and c…
An illustration showing how to construct a tangent to 2 given circles of different diameters. "Join…
An illustration showing how to construct a tangent between 2 given circles. "Join the centers C and…
An illustration showing how to construct a circle tangent to a given line and given circle. "Add the…
An illustration showing how to construct the center and radius of a circle that will tangent a given…
An illustration showing how to construct the center and radius of a circle that will tangent a given…
An illustration showing how to construct the center and radius of a circle that will tangent a given…
An illustration showing how to construct two circles that tangent themselves and two given lines. "Draw…
An illustration showing how to construct a circle that tangents two given lines inclined to one another…
An illustration showing how to construct a circle that tangents two given lines and goes through a given…
An illustration showing how to construct a cyma, or two circle arcs that will tangent themselves, and…
An illustration showing how to construct a talon, or two circle arcs that will tangent themselves, and…
An illustration showing how to construct a circle arc without recourse to its center, but its chord…
An illustration showing how to construct a center and radius of a circle that will tangent the three…
An illustration showing how to construct an equilateral triangle inscribed in a circle. "With the radius…
An illustration showing how to construct a square inscribed in a circle. "Draw the diameter AB, and…
An illustration showing how to construct a square circumscribed about a circle. "Draw the diameters…
An illustration showing how to construct a pentagon inscribed in a circle. "Draw the diameter AB, and…
An illustration showing how to construct a pentagon on a given line. "From B erect BC perpendicular…
An illustration showing how to construct a hexagon in a given circle. "The radius of the circle is equal…
An illustration showing how to use isometric perspective. "This kind of perspective admits of scale…
An illustration showing how to construct an ellipse. "With a as a center, draw two concentric circles…
An illustration showing how to construct an ellipse using circle arcs. "Divide the long axis into three…
An illustration showing how to construct a cycloid. "The circumference C=3.14D. Divide the rolling circle…
An illustration showing how to construct an evolute of a circle. "Given the pitch p, the angle v, and…
An illustration showing a circle with radius r, diameter d, and chord c.
An illustration showing a circle sector with radius r, center/central angle v, and length of circle…
An illustration showing a circle sector with center/central angle v and polygon angle w.
An illustration showing a triangle with sides b, c, and d inscribed in a circle with radius r.
An illustration showing a circle with radius r inscribed in a triangle with sides a, b, and c.
An illustration showing a quadrilateral inscribed in a circle that is tangent to a line.
An illustration showing a triangle with angles A, C, and D inscribed in a circle which is tangent to…
An illustration showing a circle with sectors D and E inscribed in a triangle with angles, A, B, and…
An illustration showing a model of a circle with intersecting chords that illustrates the following…
"It is found that the cord covering the curved surface is twice as long as the one covering the flat…
An illustration showing a model of a circle with an exterior angle formed between a tangent and a secant…
An illustration showing a model of a circle with angles formed between tangents and secants that illustrates…
An illustration showing a model of 2 circles with tangent lines, diameters, and radii that illustrates…