ClipArt ETC
Angle of degree 141

Angle Degrees 141

Angle of degree 141

Angle of degree 142

Angle Degrees 142

Angle of degree 142

Angle of degree 143

Angle Degrees 143

Angle of degree 143

Angle of degree 144

Angle Degrees 144

Angle of degree 144

Angle of degree 145

Angle Degrees 145

Angle of degree 145

Angle of degree 146

Angle Degrees 146

Angle of degree 146

Angle of degree 147

Angle Degrees 147

Angle of degree 147

Angle of degree 148

Angle Degrees 148

Angle of degree 148

Angle of degree 149

Angle Degrees 149

Angle of degree 149

Angle of degree 150

Angle Degrees 150

Angle of degree 150

Angle of degree 151

Angle Degrees 151

Angle of degree 151

Angle of degree 152

Angle Degrees 152

Angle of degree 152

Angle of degree 153

Angle Degrees 153

Angle of degree 153

Angle of degree 154

Angle Degrees 154

Angle of degree 154

Angle of degree 155

Angle Degrees 155

Angle of degree 155

Angle of degree 156

Angle Degrees 156

Angle of degree 156

Angle of degree 157

Angle Degrees 157

Angle of degree 157

Angle of degree 158

Angle Degrees 158

Angle of degree 158

Angle of degree 159

Angle Degrees 159

Angle of degree 159

Angle of degree 160

Angle Degrees 160

Angle of degree 160

Angle of degree 161

Angle Degrees 161

Angle of degree 161

Angle of degree 162

Angle Degrees 162

Angle of degree 162

Angle of degree 163

Angle Degrees 163

Angle of degree 163

Angle of degree 164

Angle Degrees 164

Angle of degree 164

Angle of degree 165

Angle Degrees 165

Angle of degree 165

Angle of degree 166

Angle Degrees 166

Angle of degree 166

Angle of degree 167

Angle Degrees 167

Angle of degree 167

Angle of degree 168

Angle Degrees 168

Angle of degree 168

Angle of degree 169

Angle Degrees 169

Angle of degree 169

Angle of degree 170

Angle Degrees 170

Angle of degree 170

Angle of degree 171

Angle Degrees 171

Angle of degree 171

Angle of degree 172

Angle Degrees 172

Angle of degree 172

Angle of degree 173

Angle Degrees 173

Angle of degree 173

Angle of degree 174

Angle Degrees 174

Angle of degree 174

Angle of degree 175

Angle Degrees 175

Angle of degree 175

Angle of degree 176

Angle Degrees 176

Angle of degree 176

Angle of degree 177

Angle Degrees 177

Angle of degree 177

Angle of degree 178

Angle Degrees 178

Angle of degree 178

Angle of degree 179

Angle Degrees 179

Angle of degree 179

Angle of degree 180

Angle Degrees 180

Angle of degree 180

Complementary angles 89 degrees and 1 degree

Complementary Angles 89-1

Complementary angles 89 degrees and 1 degree

"...and is constructed with a zinc plate suspended between two carbon plates, so as to have two carbon surfaces exposed to the direct action of two zinc surfaces, and as close to them as praticable without contact, to reduce teh electric resistance through the fluid to the lowest degree." -Atkinson 1903

Grenet Cell

"...and is constructed with a zinc plate suspended between two carbon plates, so as to have two carbon…

"...and is constructed with a zinc plate suspended between two carbon plates, so as to have two carbon surfaces exposed to the direct action of two zinc surfaces, and as close to them as praticable without contact, to reduce teh electric resistance through the fluid to the lowest degree." -Atkinson 1903

Grenet Cell

"...and is constructed with a zinc plate suspended between two carbon plates, so as to have two carbon…

"If the ball approaches the floor under a larger or smaller angle, its rebound will observe the same rule [of reflected motion]." -Comstock 1850

Reflected Motion

"If the ball approaches the floor under a larger or smaller angle, its rebound will observe the same…

"The ray a, c, is the ray of incidence, and that from c, to d, is the ray or reflection. The angles which a, c, make with the perpendicular line, and with the plane of the mirror, is exactly equal to those made by c, d, with the same perpendicular, and the same plane surface." -Comstock 1850

Reflection of Light

"The ray a, c, is the ray of incidence, and that from c, to d, is the ray or reflection. The angles…

"Suppose the mirror, a b, to be placed on the side of a room, and a lamp to be set in antoher room, but so situated as that its light would shine upon the glass. The lamp itself could not be seen by the eye placed at e, because the partition d is between them; but its image would be visible at e, beacuse the angle of the incident ray, coming from the light, and that of the reflected ray which reaches the eye, are equal." -Comstock 1850

Plane Mirror

"Suppose the mirror, a b, to be placed on the side of a room, and a lamp to be set in antoher room,…

"This will be understood [here] where the ray of light A B, proceeding from the eye, falls perpendicularly on the plane mirror B D. will be reflected back in the same line; but the ray C D coming from the feet, which falls obliquely on the mirror, will be reflected back under the same angle in the line D A; and since we see objects in the direction of the reflected rays, and the image appears at the same distance behind the mirror that is object is before it, we must continue the line A D to the feet, E, and for the same reason, the rays A B, from the eye, must be prolonged to F, as far behind the mirror as the line E extends, where the whole image will be represented." -Comstock 1850

Mirror Half the Length of the Object

"This will be understood [here] where the ray of light A B, proceeding from the eye, falls perpendicularly…

"...as the arrow is moved backwards, the angle at c, must be diminished, because the rays flowing from the extremities of the object fall a greater distance before the reach the surface of the mirror; and as the angles of the reflected rays bear a proportion to those of the incident ones, so the angle of vision will become less in proportion, as the object is withdrawn." -Comstock 1850

Convex Mirror

"...as the arrow is moved backwards, the angle at c, must be diminished, because the rays flowing from…

"...let us suppose the object a, to be placed before the mirror, and nearer to it than the principal focus. Then the rays proceeding from the extremities of the object without interruption, would continue to diverge in the lines o and n, as seen behind the mirror' but by reflection they are made to diverge less than before, and consequently to make the angle under which the meet more obtuse at the eye b, than it would be if they continued onward to e, where they would have met without reflection. The result therefore, is to render the image h, upon the eye, as much larger than the object a, as the angle at the eye is more obtuse than the angle at e." -Comstock 1850

Object Within the Focus in a Concave Mirror

"...let us suppose the object a, to be placed before the mirror, and nearer to it than the principal…

"Suppose the object a, appears to the naked eye of the length repreesnted in the drawing. Now, as the rays coming from each end of the object, form by their convergence at the eye, the visual angle, or the angle under which the object is seem, and we call objects large or small in proportion as this angle is obtuse or acute, if, therefore, the object a be withdrawn futher from the eye, it is apparent that the rays o, o, proceeding from its extremities, will enter the eye under a more acute angle, and therefore that the object will appear diminished in proportion." -Comstock 1850

Visual Angle

"Suppose the object a, appears to the naked eye of the length repreesnted in the drawing. Now, as the…

"The angle under which the rays of light, coming from the extremities of an object, cross each other at the eye, bears a proportion directly to the length, and inversely to the distance of the object." -Comstock 1850

Angle of Vision

"The angle under which the rays of light, coming from the extremities of an object, cross each other…

"Direction of the needle when placed at a right angle to the uniting wire." -Comstock 1850

Wire at Right Angle to the Uniting Wire

"Direction of the needle when placed at a right angle to the uniting wire." -Comstock 1850

"Firmly fasten one end of a piece of spring-brass wire, about No. 27 and about 1 m. long so that the wire hangs vertical. To the lower end of the wire fasten a weight of 75 or 100 g. To this weight attach a pointer so that it extends horizontally from the direction of the wire. Turn the weight througha considerable angle, thus twisting the wire. Release the weight, and notice the rapid movements of the pointer of the torsional pendulum." -Avery 1895

Torsional Pendulum

"Firmly fasten one end of a piece of spring-brass wire, about No. 27 and about 1 m. long so that the…

"The angle, ABD, included between the direction of the moving body before it strikes the reflecting surface, and a perpendicular to that surface drawn from the point of contact, is called the angle of incidence. The angle between the perpendicular and the direction of the moving body after striking is called the angle of reflection." -Avery 1895

Law of Reflected Motion

"The angle, ABD, included between the direction of the moving body before it strikes the reflecting…

"An inclined plane is a smooth, hard, inflexible surface, inclined so as to make an oblique angle with the horizon." -Avery 1895

Inclined Plane

"An inclined plane is a smooth, hard, inflexible surface, inclined so as to make an oblique angle with…

"By placing two plane mirrors facing each other, we may produce an indefinite series of images of an object between them. Each image acts as a material object with respect to the other mirror, in which we see an image of the first image, etc. When the mirrors are placed so as to form with each other an angle that is an aliquot part of 360 degrees, the number of images is one less than the quotient obtained by dividing four right angles by the included angle, provuded that quotient is an even number." -Avery 1895

Multiple Images in a Plane Mirror

"By placing two plane mirrors facing each other, we may produce an indefinite series of images of an…

"A prism is a transparent body with two refraction surfaces that lie in intersecting planes. The angle formed by these planes is called the refracting angle." -Avery 1895

Prism

"A prism is a transparent body with two refraction surfaces that lie in intersecting planes. The angle…

"Cathetal prisms readily yield the phenomena of total reflection as shown, and are often used when light is to be turned through a right angle." -Avery 1895

Cathetal Prism

"Cathetal prisms readily yield the phenomena of total reflection as shown, and are often used when light…

"The magnetic poles of the earth do notc oincide with its geographical poles and, condequently, in some places, the magnetic needle does not point ot the geographical north. The angle that the axis of a compass-bneedle makes with the geographical meridian at any place is called the declination or variation of the needle at that place...Lines drawn through places on the earth where the declination is the sam are called isogonic lines, as shown." -Avery 1895

Isogonic Lines of Earth

"The magnetic poles of the earth do notc oincide with its geographical poles and, condequently, in some…

"An inclined plane is a slope, or flat surface, making an angle with a horizontal line...the force acts parallel to the plane." —Hallock 1905

Inclined Plane with the Force Acting Parallel to the Plane

"An inclined plane is a slope, or flat surface, making an angle with a horizontal line...the force acts…