Alexandria gazette & daily advertiser. [volume] (Alexandria [Va.]) 1817-1822, 1817-09-19

4
of latitude in the two kemisptergs: !,
| it not intensely cold about The an,,r.i'
circle on he god December; where
it is 70; intensely hot about the ,,r.i,,
circle on the 2Ist Jane? h)
Query. Viii the vapors from The 60,
answer equally is sell tc accOun, lorr.
continual snow Of the Prince Edw,,i
sles, aud the intense heat at nid.ump.,
OF Norway? (D
Query II two vessels sailed from II.
opposite shores Of a bay forty mile, !,
width, the one sailing directly east and
me other west II both vessels, from e.rb
shore. appear to have the appear ance Of
de- cendns into an abyss, do such an
pearauces prove conca,ity or conyexity:
or rather IS it mot altogether an optics!
appearances (k)
9. According to the method laid dO,,
in the books to ascertain tie earth's cur.
vature: for given dis'an &c, light house
must possess an altitude Of 1000 lee, 10
be seen forty miles at sea, from an eIsya.
ton of 66 2-5 feet in the tops. Is the rule
erroneous, or is there no such curvature;
| (D
3. Was canal to be cut from Bait.
more TO Washington City, say ~ miles,
would it he nece sary TO make all ALLOW.
ance OF ,O56 2-S fee, for the earth, GU.
yatu:e, Ill audi ion to The elevation IL II.
hiyhg ounds above the level Of tie bay,
I'M
4. Was caral 10 be cut The Who'll
length Of the Mississippi river. say 1860
miles, wau!j it I've necessary 10 make an
allowance for TIE earth's curvature If
oct, OoU ieet, OR 49, 62 miles, over and
above the elevation OF the source Of that
river above the level # the Gull Vi Mex.
icoi (n)
Qusry. If ship had mas as high a.
a cannon bullet would asceEd HEca d.
.sarged perpendicuiariy upwards. ard if
The .nip's velocity from west 10 ta,t was
equal 10 tle diurral motion of The earth,
ia miles per minute) Ncu'I a bali,
dIopt from the top OF said mast, light az
precisely on deck a, If ssiG ship was 4:
anchorf ID
Gasry. II there is any thing Ike co.,
rect mode ior sscertainihs tie distance
of the celestial bodies, how come, il to
pas. that there is d. ticreLce among emf
neut writers on the Sul Ct Of The millions
Of years thai it would lake caunon JI'-
let u reach the nearest Of them! Tbs
difference beiI the more extraordinary
since a difference alone Of single year
calculating by tie hrgat d Cannon bGi.
iet, would make difference, as to tie
distance, OF some million. of miles. (F)
PTOLEMN
For Tie Mercantile .4drertiser.
REPLIE9.
a. The two hemispheres are very ur-
like each other in figure, height OF noun
taiDs. anu in vegetable and Animal pro.
ductions. Tie southern is colder, and
the northern has longer duration oi sur
shine
b. No.
c. The southern celestial hemisphere
contains stars which Lave been regularly
grouped by astronomers with colsteIla-
tons.
de. Referred to the problems solved
by the artificial globe or sphere.
I. II = cot recolected that any per-
son has in the northern hemisphere seen
the ,un 10 the south during the night.
z. l. is believed the Jaws Of ragne.
tism are he same in both hemisphere,
the magnstifed vision being acted upon in
the same wa'.
h. There IS TO report BY travellers c!
The intensity Of cold about tue sEtartic
circle on the s2d December On The con-
trary. our nayigstors employ tba, season
TO double Cape Horn. Nor have we esi-
deuce of The intense heat about the arctic
circle OF the 2lst iun". The "halemeD,
and other yoyssers TO the north, have 10!
related any such intense heat.
I. 1t does net appear probable that va
per from the sea viii equal Y well scccuni
for the Continual >n-W .i he Pi,Ele Ed
ward Isles, aud the intense Leaf at mid.
summer Of Norway. Oh,r n.atiers must
te taken into The accoun..
K. As far as there is at, thing in thi,
qscry, the case depends upon optical h.
lusiCD, anu hot upon coUoavty Cr con
veXity OF tie water, which is ALWAYS d..
pesei TO preserve lis leve. as far as tie
ear.h's she tty vii permit.
|. The tables in Mo- e's Navigator
seem to be sufficient a. x'er 10 ti.i..-
There IS curvature, though the rule
qsoted nav lie er, oaeou..
l'ta an -