The semicircle on a sector in two books. Containing the description of a general and portable instrument; whereby most problems (reducible to instrumental practice) in astronomy, trigonometry, arithmetick, geometry, geography, topography, navigation, dyalling, &c. are speedily and exactly resolved. By J. T.
About this Item
Title
The semicircle on a sector in two books. Containing the description of a general and portable instrument; whereby most problems (reducible to instrumental practice) in astronomy, trigonometry, arithmetick, geometry, geography, topography, navigation, dyalling, &c. are speedily and exactly resolved. By J. T.
Author
Taylor, John, 1666 or 7-1687.
Publication
London :: printed for William Tompson, bookseller at Harborough in Leicestershire,
1667.
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Subject terms
Mathematics -- Early works to 1800.
Navigation -- Early works to 1800.
Dialing -- Early works to 1800.
Link to this Item
http://name.umdl.umich.edu/A64223.0001.001
Cite this Item
"The semicircle on a sector in two books. Containing the description of a general and portable instrument; whereby most problems (reducible to instrumental practice) in astronomy, trigonometry, arithmetick, geometry, geography, topography, navigation, dyalling, &c. are speedily and exactly resolved. By J. T." In the digital collection Early English Books Online. https://name.umdl.umich.edu/A64223.0001.001. University of Michigan Library Digital Collections. Accessed June 1, 2024.
Pages
Sect. 1.
To delineate an horizontal Dial. See Fig. 9.
First draw the square BCDE. of what
quantity the plain will permit. Then make
AF=AG=HD=HE=sine of the latitude,
and AH=Radius. Enter HD. in tang. 45.
and keeping the Sector at that gage, set off
HI=HK=tang. 15. and HO=HL=tang. 30.
Again, enter FD. in tang. 45. and set off
FQ=GN=tang. 15. and FP=GM=tang. 30.
This done,
Draw AQ. AP. AD. AO. AI. for the
hour lines of 5. 4. 3. 2. 1. afternoon. Again,
Draw AK. AL. AE. AM. AN. for the
hour lines of 11. 10. 9. 8. 7. before noon.
The line FAG. is for six and six. In the
same manner you may prick the quarters of
an hour, reckoning three tangents, and 45.
descriptionPage 127
minutes, for a quarter. How to draw the
hour lines before, and after six, was menti∣oned,
Chap. 2. Sect. 1.
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