The British encyclopedia, or, Dictionary of arts and sciences, Том 5 |
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... plate . And the three pieces , tiz , the two circles and index , are joined by a rivet which is pierced through the centre with a hole , through which the star is to be observed . " To use the Nocturnal , " turn the upper plate till the ...
... plate . And the three pieces , tiz , the two circles and index , are joined by a rivet which is pierced through the centre with a hole , through which the star is to be observed . " To use the Nocturnal , " turn the upper plate till the ...
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... ( Plate Observatory , fig . 1. ) represent an arch of a circle con taining ten or twelve degrees well divided , having a strong plate , CD , for its radius , fixed to the middle of the arch at D. Let this radius be applied to the side of ...
... ( Plate Observatory , fig . 1. ) represent an arch of a circle con taining ten or twelve degrees well divided , having a strong plate , CD , for its radius , fixed to the middle of the arch at D. Let this radius be applied to the side of ...
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... plate , whose length being equal to sixteen quarters of a degree , is divided into fifteen equal parts , which , in effect , divides the limb into minutes , and , by esti- mation , into smaller parts . The length of the square axis ...
... plate , whose length being equal to sixteen quarters of a degree , is divided into fifteen equal parts , which , in effect , divides the limb into minutes , and , by esti- mation , into smaller parts . The length of the square axis ...
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... plate moving in a horizontal , and the other in a vertical direction ; or , which is more simple , these two modes are sometimes applied only on one side , as at V and P , the horizontal motion by the screw P , and the vertical by the ...
... plate moving in a horizontal , and the other in a vertical direction ; or , which is more simple , these two modes are sometimes applied only on one side , as at V and P , the horizontal motion by the screw P , and the vertical by the ...
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... ( Plate I. Optics , fig . 1. ) they are said to di- verge . If they continually approach to- wards each other , as in moving from cd to C , they are said to converge . The point at which converging rays meet , is called the focus . The ...
... ( Plate I. Optics , fig . 1. ) they are said to di- verge . If they continually approach to- wards each other , as in moving from cd to C , they are said to converge . The point at which converging rays meet , is called the focus . The ...
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