|
proportional instrument: unusual instrument used to mechanically perform functions in trigonometry.
|
protractor: instrument for setting out and measuring degrees.
|
quadragesima: the 40 days of Lent or the first Sunday in Lent.
|
quadrans vetus: type of horary quadrant, see article on the quadrant.
|
quadrant: instrument based on a quarter of a circle, see article on the quadrant.
|
quadratum nauticum: diagram for finding course directions from latitudes and longitudes, see article on the astrolabe.
|
quatrefoil: decorative form with four leaves or petals.
|