blue-printing paper
101photography, history of — Introduction method of recording the image of an object through the action of light, or related radiation, on a light sensitive material. The word, derived from the Greek photos (“light”) and graphein (“to draw”), was first used in the… …
102List of United States inventions — 1700s1731 Sextant * The sextant is an astronomical instrument that is used to determine latitude for navigation. It does this by measuring angular distances, like the altitude of the sun, moon and stars. The sextant was invented independently in… …
103Germany — /jerr meuh nee/, n. a republic in central Europe: after World War II divided into four zones, British, French, U.S., and Soviet, and in 1949 into East Germany and West Germany; East and West Germany were reunited in 1990. 84,068,216; 137,852 sq.… …
104Federal Reserve System — FRB and FED redirect here. For other uses, see FRB (disambiguation) and FED (disambiguation). Federal Reserve System …
105Flag of the United States — American Flag redirects here. For the Arizona ghost town, see American Flag, Arizona. Flag of Columbia redirects here. For the flag of the South American country, see Flag of Colombia. Flag of the United States of America Name …
106Light-emitting diode — LED redirects here. For other uses, see LED (disambiguation). Light emitting diode Red, pure green and blue LEDs of the 5mm diffused type Type Passive, optoelectronic Working principle Electr …
107Great Seal of the United States — Reverse of the Seal …
108Engineering drawing — Technical drawings An engineering drawing, a type of technical drawing, is used to fully and clearly define requirements for engineered items. Engineering drawing (the activity) produces engineering drawings (the documents). More than just the… …
109Dots per inch — A close up of the dots produced by an inkjet printer at draft quality. Actual size is approximately 0.25 inches square (0.635 centimetres square). Individual coloured droplets of ink are visible; this sample is about 150 DPI. Dots per inch (DPI)… …
110Thermal transfer printer — A thermal transfer printer is a printer which prints on paper (or some other material) by melting a coating of ribbon so that it stays glued to the material on which the print is applied. It contrasts with Direct Thermal printing where no ribbon… …
