20

CALCULATIONS TO ASCERTAIN THE

TRACT 26

| ^^^ctCOtOCOCOOC*-**

Sum of 8and 9,-or |Log. I)ep.ana Alt.

1-52865

1- 66430

2- 069302-318722-541102-715692-82159

2- 91052

3- 014223-106443-15287

10

Tang,of Dep.andElev.

8-78022

8-65715

8- 90080

9- 035979-139489-273579-339749-389189-449339-500929-51178

a>

i + *?

« a,

i o s “

zn to

2- 74843

3- 007153 168503-282753-401623-442123-481853-521343-564893-605523-64109

8

(6 ,a .5«S w

9-59903

9-85775

0-01910

0-13335

0-25222

0-29272

0-33245

0-37194

0-41549

0-45612

0-49169

7

so •

« ft,a u*

OT °

9-91763

9-84643

9-77473

9-70973

9-61828

9-60302

9-57075

9-53991

9-50486

9-47127

9-44122

CO

Sinesof R.

9-51666

9-70418

9-79383

9-84308

9-87050

9-89574

9-90320

9-91185

9-92035

9-92739

9-93291

75° -

Z’S R,

or an-gles p.

"a

•^ 00*0 cvo-icriH

°in •-^coot-co — ocor-co

iO-ef’COCOC?CS>C*CV>-s

•4*

Horiz.

Angle

1 at R.

"i-» tfccciOdOiOr-r-co** C* •<*

°cn Oco-j-hH co i> ao

— CTi CO -7^ co to 40 to

CO

Anglesof Dep.and El.i at s.

Q W

to n w « OO O l£> W HI o

C^COCO-^aOCOC^ti’KtCO

c*

!

1 z &

-tWOtfiOtOMOOlO-

-

Thus then every line in the table contains the solutions ofthe two triangles, the one horizontal and the other vertical,used in finding the altitude of each point or pole in the sec-tion. The addition of the constant logarithm of the base rs,to the logarithms in the seventh column, is most easily per-formed by writing it on the bottom of a small slip of paper,and so sliding it down successively over each of those num-bers, then in that position adding them together, and placingthe sums immediately opposite, in the next column.

And in this manner were computed the relative altitudesof the points in the other vertical sections; excepting two or