. The Boston school compendium of natural and experimental philosophy .. . e reason,balls made of Caoutchouc, or India Rubber, will re-bound more than those which are made of other sub-stances. 120. The word incident, or incidence, means fallingupon, or directed towards. Incident motion thereforeis motion directed towards any particular object. Re-flected motion is the same motion turned back. Whena ball strikes against a wall, it is called the inci-dent ball; and when it rebounds from the wall it iscalled the reflected ball. 121. The angle* of incidence is the angle formed by * As this book m
. The Boston school compendium of natural and experimental philosophy .. . e reason,balls made of Caoutchouc, or India Rubber, will re-bound more than those which are made of other sub-stances. 120. The word incident, or incidence, means fallingupon, or directed towards. Incident motion thereforeis motion directed towards any particular object. Re-flected motion is the same motion turned back. Whena ball strikes against a wall, it is called the inci-dent ball; and when it rebounds from the wall it iscalled the reflected ball. 121. The angle* of incidence is the angle formed by * As this book may fall into the hands of some who are unacquainted with themeaning of angle, perpendicular, the divisions of a circle, &c. a few explanation!are here subjoined. 1. An angle is the opening made by two lines which meet together in a size of the angle depends upon the opening, and not upon the length of thelines. 2. A circle is a perfectly round figure, every partof the outward edge of which is equally distantfrom a point within, called the centre. [See 6t The straight lines drawn from the centre to the circumference are called radii. [Thesingu-lar number of this word is radius.] Thus, in , the lines CD, CO,CR, and CA,are radii. 4. The lines drawn through the centre, and ter-minating in bolh ends at the circumference, arecalled diameters. Thus, in the same Figure, D Ais a diameter of the circle. 5. The circumference of all circles is divided in-to 360 equal parts, called degrees. The diameter of a circle divides it into twoequal parts of 180 degrees each. 6. AH angles are measured by the number of degrees which they contain. Thusin Fi. 6, the angle R C A as it includes one quarter of the circle, is an angleof90 degrees, which is a quarter of 360. And the angles R C O and O C D areangles of 45 degrees. 7. Angles of 90 degrees are right angles ; angles of less than 90 degrees, acuteangles, and angles of moie than 90 degrees are culled obtuse angles. Thus,inFig.
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Keywords: ., bookcentury1800, bookdecade1830, booksubjectphysics, bookyear1837
