The British Encyclopedia: Or, Dictionary of Arts and Sciences. Comprising an Accurate and Popular View of the Present Improved State of Human Knowledge, Τόμος 5Longman, Hurst, Rees, and Orme, 1809 |
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Σελίδα
... centre . These are soluble , according to Henry , in an equal weight of boiling water , and twice their weight of cold ; soon deliquesce on exposure to the air ; and are decomposed at a red heat . Fourcroy says , that cold water ...
... centre . These are soluble , according to Henry , in an equal weight of boiling water , and twice their weight of cold ; soon deliquesce on exposure to the air ; and are decomposed at a red heat . Fourcroy says , that cold water ...
Σελίδα
... centre , turn the index about till , by the edge coming from the centre , you see the bright star or guard of the little bear ( if the instrument be fitted to that star ) : then that tooth of the upper circle , under the edge of the ...
... centre , turn the index about till , by the edge coming from the centre , you see the bright star or guard of the little bear ( if the instrument be fitted to that star ) : then that tooth of the upper circle , under the edge of the ...
Σελίδα
... centre of its circumference falls ex- actly in the axis of the glass ; and to be ill centered when it falls out of the axis . To prove whether object - glasses be well cen- tered , hold the glass at a due distance from the eye , and ...
... centre of its circumference falls ex- actly in the axis of the glass ; and to be ill centered when it falls out of the axis . To prove whether object - glasses be well cen- tered , hold the glass at a due distance from the eye , and ...
Σελίδα
... centre , C , of the arch , A B , from one end of it to the other , by turning a screw at G , and let the line of sight be parallel to the plane of the sector . Now , by turning the whole instrument about the axis , HI , till the plane ...
... centre , C , of the arch , A B , from one end of it to the other , by turning a screw at G , and let the line of sight be parallel to the plane of the sector . Now , by turning the whole instrument about the axis , HI , till the plane ...
Σελίδα
... centre of which is fixed to a long vertical axis . The Equatorial or Portable Observatory , an instrument designed to answer a number of useful purposes in practical astronomy , independent of any particular observatory . It may be made ...
... centre of which is fixed to a long vertical axis . The Equatorial or Portable Observatory , an instrument designed to answer a number of useful purposes in practical astronomy , independent of any particular observatory . It may be made ...
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