The Universal Preceptor: Being a General Grammar of Arts, Sciences, and Useful Knowledge ...A. Phelps, 1826 - 312 страница |
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Страница 51
... angle , or work of a fortifica- tion , is called a bastion . The straight wall that joins bastions , and which these are to defend , is called the curtain . The projecting angles are called salient angles ; and the angles which point ...
... angle , or work of a fortifica- tion , is called a bastion . The straight wall that joins bastions , and which these are to defend , is called the curtain . The projecting angles are called salient angles ; and the angles which point ...
Страница 52
... angles . M and A the salient angles . F and N re - entering angles . y the rampart . A G the line of defence . 176 ... angle of 45 degrees ; and there are tables constructed for every degree of elevation . In battle , it is found that ...
... angles . M and A the salient angles . F and N re - entering angles . y the rampart . A G the line of defence . 176 ... angle of 45 degrees ; and there are tables constructed for every degree of elevation . In battle , it is found that ...
Страница 92
... angle , by which we can determine the exact distance of the earth from the sun . 281. Having ascertained , by means of the observa- tion of a transit , the distance of the earth from the sun , the distances of all the other planets are ...
... angle , by which we can determine the exact distance of the earth from the sun . 281. Having ascertained , by means of the observa- tion of a transit , the distance of the earth from the sun , the distances of all the other planets are ...
Страница 95
... angle of the orbit diminishes at the rate of a minute in 110 years , and a degree in 6,600 years . Observations were made in China 2,900 years ago ; by which it appears , that the obliquity was 23 ° . 54 ' ; but is now only 23 ° . 28 ...
... angle of the orbit diminishes at the rate of a minute in 110 years , and a degree in 6,600 years . Observations were made in China 2,900 years ago ; by which it appears , that the obliquity was 23 ° . 54 ' ; but is now only 23 ° . 28 ...
Страница 98
... angle of 45 degrees , then only half the rays will fall on its surface , and the other half will pass over it . So it is with the surface of the earth in sum- mer and winter . 2. The increased heat in the polar regions is amazingly ...
... angle of 45 degrees , then only half the rays will fall on its surface , and the other half will pass over it . So it is with the surface of the earth in sum- mer and winter . 2. The increased heat in the polar regions is amazingly ...
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