ratio between gold and silver
21Classic Head Quarter Eagle — The classic head $2.50 gold coin is an American coin, also called a Quarter Eagle, minted from 1834 1839.[1] The 1834 Classic Head $2.50 Contents 1 …
22Timeline of Islamic science and engineering — This timeline of Islamic science and engineering covers the general development of science and technology in the Islamic world during the Islamic Golden Age, usually dated from the 7th to 16th centuries.From the 17th century onwards, the advances …
23Archaeology of the Cross and Crucifix — Archæology of the Cross and Crucifix † Catholic Encyclopedia ► Archæology of the Cross and Crucifix I. PRIMITIVE CRUCIFORM SIGNS The sign of the cross, represented in its simplest form by a crossing of two lines at right angles,… …
24Biblical and Talmudic units of measurement — Biblical and Talmudic units of measurement, such as the Omer, used primarily by ancient Israelites, appear frequently within the Hebrew Bible as well as in later Judaic scripture, such as the Mishnah and Talmud. These units of measurement are… …
25Golden ratio — For the Ace of Base album, see The Golden Ratio (album). Not to be confused with Golden number. The golden section is a line segment divided according to the golden ratio: The total length a + b is to the length of the longer segment a as the… …
26separation and purification — ▪ chemistry Introduction in chemistry, separation of a substance into its components and the removal of impurities. There are a large number of important applications in fields such as medicine and manufacturing. General principles… …
27Digital gold currency — (or DGC) is a form of electronic money based on ounces of gold. It is a kind of representative money, like a US paper gold certificate at the time (from 1873 to 1933) that these were exchangeable for gold on demand. The typical unit of account… …
28Abstract labour and concrete labour — Part of a series on Marxism …
29Cortez Gold Mine — Cortez Gold Mine …
30Economic history of Greece and the Greek world — The economic history of the Greek World spans several millennia and encompasses many modern day nation states. Since the focal point of the center of the Greek World often changed it is necessary to enlarge upon all these areas as relevant to the …
