Every circumference is regarded as being divided into 360 equal parts, called degrees. Each degree is divided into 60 equal parts, called minutes, and each minute into 60 seconds. These divisions are indicated by the marks ° ' ". Thus 28 degrees, 17... A Treatise on Land-surveying: Comprising the Theory Developed from Five ... - Pàgina 379 per William Mitchell Gillespie - 1857 - 524 pàgines Visualització completa -
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