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" From the center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle ag i. "
Treatise on Mathematical Instruments: Their Construction, Adjustment ... - Side 24
av John Fry Heather - 1866 - 185 sider
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Pocket Encyclopedia: Or, A Dictionary of Arts, Sciences, and Polite ..., Volum 1

Edward Augustus Kendall - 1811 - 962 sider
...«. If a plate similar to this triangle be made as thick as the distance between the lines ac and bd, and set upright between them, touching at a and b; its hypothenuse ag will be parallel to the axis of the world, when the dial is truly set, and will cast a shadow on...
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Geometrical and Graphical Essays: Containing a General Description of the ...

George Adams - 1813 - 576 sider
...similar to this triangle, of the thickness of the interval of the parallel lines acbd which must be made and set upright between them touching at a and...axis of the earth when the dial is fixed truly, and of course cast its shadow on the hour of the day. To make an erect south dial, take the complement...
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Geometrical and Graphical Essays: Containing a General Description of the ...

George Adams - 1813 - 648 sider
...similar to this triangle, of the thickness of the interval of the parallel lines aebd which must be made and set upright between them- touching at a and b: its hypothenuse or axis ng will be parallel to the axis of the earth when the dial is fixed truly, and cf course cast its shadow...
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Lectures on Select Subjects in Mechanics, Hydrostatics, Hydraulics ..., Volum 1

James Ferguson - 1823 - 406 sider
...If a plate, similar to this triangle, be made as thick as the distance between the lines ac and bd, and set upright between them, touching at a and b, its hypothenuse a g' wUl be parallel to the axis of the world, when the dial is truly set ; and will cast a shadow...
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Lectures on Select Subjects in Mechanics, Hydrostatics, Pneumatics, Optics ...

James Ferguson - 1839 - 554 sider
...ia. If a plate similar to this triangle be made as thick as the distance between the lines ac and bd, and set upright between them, touching at a and b, its hypothenuse ag will be parallel to the axis of the world, when the dial is truly set ; and will cast a shadow on...
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A Treatise on Mathematical Instruments ...

John Fry Heather - 1849 - 202 sider
...center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there...made and set upright between them, touching at a and 5, its hypothenuse or axis ag will be parallel to the axis of the earth when the dial is fixed truly,...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John F. Heather - 1849 - 208 sider
...center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there...thickness of the interval of the parallel lines ac and bd, being now made and set upright between them, touching at a and fc, its hypothenuse or axis ag will...
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The American House Carpenters' and Joiners' Assistant: Being a New and Easy ...

Lucius D. Gould - 1853 - 234 sider
...center at a draw the line ag for the axis of the gnomon agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle agi. A plate or triangular frame similar to this triangle, and of the thickness of the interval of...
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The American House Carpenters' and Joiners' Assistant

Lucius D. Gould - 1857 - 464 sider
...center at a draw the line ag for the axis of the gnomon ag 1, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will be formed a triangle ag 1. A plate or triangular frame similar to this triangle, and of the thickness of the interval of the...
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A Treatise on Mathematical Instruments: Including Most of the Instruments ...

John Fry Heather - 1859 - 198 sider
...agi, and from g let fall the perpendicular gi upon the horizontal meridian line an, and there will he formed a triangle ag i. A plate or triangular frame...thickness of the interval of the parallel lines ac and bd, being now made and set upright between them, touching at a and b, its hypo then use or axis ay...
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