The Projection And Calculation of the Sphere for Young Sea Officers Being a ...
The Projection And Calculation of the Sphere for Young Sea Officers Being a ...
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To quickly assess the difficulty of the text, read a short excerpt:
disj. x cos of other ext. disj.
radius.
Now, before proceeding, let us consider what is meant by this equation, and why it was further altered into rule c (88). We have already shown that multiplication is per- formed in logarithms by addition ; and division by subtrac- tion ; and in the fraction standing on the right side of the sign of equation, there are two quantities to be multiplied, and a quantity which is to divide their product. We there- fore add the logarithms of the two factors in t...he nume- rator from the sum and subtract the logarithm of the denominator.
92a In a proportion worked by logarithms it is better to place the terms vertically (putting^ the divisor as the first term), thus : — As radius is to cos extreme disjunct, so is cos of the other extreme disjunct to the sine of the middle part (Remember old Dr. Kelly's Hibernian rhyme: — ) " Now the product of radius and middle part sine, Equals that of the tangents of parts that combine, And also the cosines of those that dis/otn.") F 2 Digitized by CjOOQ IC 68 NAUTICAL ASTEONOMT.
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You can find similar books in the "Read Also" column, or choose other free books by S. M. Saxby to read onlineMoreLess
To quickly assess the difficulty of the text, read a short excerpt:
disj. x cos of other ext. disj.
radius.
Now, before proceeding, let us consider what is meant by this equation, and why it was further altered into rule c (88). We have already shown that multiplication is per- formed in logarithms by addition ; and division by subtrac- tion ; and in the fraction standing on the right side of the sign of equation, there are two quantities to be multiplied, and a quantity which is to divide their product. We there- fore add the logarithms of the two factors in t...he nume- rator from the sum and subtract the logarithm of the denominator.
92a In a proportion worked by logarithms it is better to place the terms vertically (putting^ the divisor as the first term), thus : — As radius is to cos extreme disjunct, so is cos of the other extreme disjunct to the sine of the middle part (Remember old Dr. Kelly's Hibernian rhyme: — ) " Now the product of radius and middle part sine, Equals that of the tangents of parts that combine, And also the cosines of those that dis/otn.") F 2 Digitized by CjOOQ IC 68 NAUTICAL ASTEONOMT.
What to read after The Projection And Calculation of the Sphere for Young Sea Officers Being a ...?
You can find similar books in the "Read Also" column, or choose other free books by S. M. Saxby to read onlineMoreLess
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