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20 to 29 of 227 glossary terms
Babylonian hours: system of hour reckoning, see article on time and date.
baseline: measured distance between two positions used as the observing stations for a triangulation survey; angles measured from this line serve to locate the other points in the survey.
Butterfield dial: type of sundial adjustable for latitude, whose gnomon incorporates a latitude pointer often in the form of a bird. This dial type is associated with the 17th-century Paris-based English maker Michael Butterfield.
calendar: system of reckoning dates, see article on time and date.
calendar-zodiac scale: scales relating the sun's position in the zodiac to the date.
caliper: instrument used to take dimensions. One type has two curved legs whose endpoints are used to determine the diameters of spheres.
Cardan suspension: universal mounting attributed to the 16th-century Italian philosopher and physician Girolamo Cardano which, by means of gimbals, allows the supported part to remain horizontal irrespective of the orientation of the rest of the instrument.
cardinal points: the main directions on the mariner's compass, north, south, east and west.
carpenter's rule: measuring ruler carrying one or more scales for calculating the volume of timber or the surface area of board or planking.
celestial globe: globe marked with the positions of the stars.
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