Vowels have a wide, firm, and free channel, whereby the breath is modified without friction or sibilation.…
Illustration of a pentagon with sides measuring 6 2/3', 4 1/2', 5 1/3', 4 3/4', and 9 5/12'.
Illustration of a lever with fulcrum F. W represents the weight lifted, P is the force that does the…
Illustration of an ordinary steel-yard being used as a lever. F represents the fulcrum. Weight P is…
Illustration of a hydraulic machine. "A principle known as Pascal's Law states that pressure exerted…
Illustration used to show how to divide a line into any number of equal parts by construction.
Illustration used to construct an equilateral triangle on a given base.
Illustration used to construct a triangle given the length of the base and the two base angles.
Illustration used to construct a circle when given three points.
Illustration used to draw lines which are radii of a circle where the center is inaccessible.
Illustration used to construct a square that shall be a multiple of any given square.
Illustration used to construct a square that shall be in proportion to a given square.
Illustration used to construct a square that shall be in proportion to a given square.
Illustration used to draw a parabola when given the base and height.
Illustration used to draw a an ellipse using string and pins by describing a circles with diameters…
Illustration used to draw a an ellipse with major axis AB and minor axis CD.
John Brown (1800 – 1859) was an American abolitionist who advocated and practiced armed insurrection…
John Brown's Fort (the engine house) from John Brown's Raid on Harpers Ferry. Brown led a group of 21…
Harpers Ferry is a historic town in Jefferson County, West Virginia. It is located at the confluence…
National Historic home of President Abraham Lincoln in Springfield, Illinois. Abraham Lincoln lived…
A political cartoon of the Southern states being built from the ruins after the Civil War.