bcxxvi p i T R O B U G T I G N.
The ’mile.en*£lüÿed by dhé: Âomansanv .Gi^at ^Britain, and' reftored b ÿ Henry VIL was ourp^efenfc Englifo
^ T h e a f t â t : : 'R'óman' mile ïs Here efflmatcd at 755 French- fathom* £ feetTupôn ïhe aü th on l^ ö fd A n viHq
Thi%dii|ers*a.hutè from the mile ufedli^the preceding tah fe - É
; ■ /. Ÿhsiiprefent F r'snch.Meajures, " -
479. The meafure o f length is the metre | the Jmea-
füreLof Capacity is" the' litre ; • the meafure o t weight* is-
the gramme ; äiihth'e Agrarian meafureis the are. '■
480. A ,metre Ä h e 40 millionth, part o f a meridian
o f the eàrth, ’whtçlf, aCcordmg*to the la&^Frenéhmèâ-1
furement;, is '39j3” 02 rÊnglilh -inches : and th i s is ’ the'
unity o f length. A decimetre is ~ô?,|ï|^-toetre ; a centimetre
is Tö^id fA'’a1 metre ; a InilJimetre il ^ | ' 0f a
mptre, &c. and a decametre is 10 metres.; an. Ke6tö-
metre- is %po metres;; a kdom-etre. ßtööbP metresy^&cV'
Thus^ àlFthe multi^ies "and fubmuMpfe®* are taken in â
teîpfi^^pTOportîôh1;1 .änd thé1 fame fpt fhe othér meàfùrès.
48 t. A /i/rrhiraccùbe whofe ftde is ôf*a metre ; i t
contains,therefore 01,0242' eiî^ie’ inçhes'; and this-is the-
unity îdffolidity; ;Ä ie iÉ t r e is o f a litre ; a 'eehti-
litre is o f a litre ; a millilitre is T |jÉ| of a‘ litre, &c,.
A n d a decalitre is 10 litres ; an'Ee&oKtnris too KM sV
à kilolitre is iOoe litres,iftlv .
482. A grammê is the i^eight^of a cube o f difrofèd?
Yratér, th e Ide- o f which- is | 8 | o f a metfe ; ihwèighs-
therefore 15,45 ounces troy ; and'this is tdfé unity- of?
-weight. A decigramme- ó f a gramme ; a centi^.
gramme-is 5 bfä^gramme : a milligramme i s ^ c o °£r
a glimme, r&c; A n d a decagramme is 10 grammes ;
am h e & o g x am m e g r am m e 's akilogramnjeis rbojc
grammes, &c.* ■
483. A n are is the fquare o f th è ’dèqamêtre/ pïti oö;
fqüare metres* ; and this- is the unity.' A "declare^
an.are ; a centiare is -yah o f an afey~ä; tfiilliafè i^ T o ó 'g^
an are, See. A n d ’ a deca-afe^ ór decare, is ip ares ; an
hectare' is iq p ares ^ a.kiläre is i^o ö äres, &c. '
\ ^ '& n 0 p% à ^ lin e .
484*^ i^lö glls'a piece of .hoard in the 'fprmj^of. the
quadrant o f a circle, Haying its circular fide loaded" with
weights to make it fwiih upright. , T o this log is fa.ft-
ened a line '^fj abqut 150 fathoms, called the lu g line?
this is. divided into "equal fp^ceSj 'eSUfed k^ot^ e a ^ o f
which"p,ught^to-bear t ie fame proportion to (a nautical
mi-le^ as ^ a minutfe bears to',an-hour. | T he y .are called
knots,, becaufe at.the end o f each o f them there is fixed
a. piece* ° f twine with knots in it ; and there are fuhdivided
into tenths., J-sTowa nautical mile— 6120 feet*.and
the pa rt-r^ i f e e y 1 n ow * 4 '> £ b §^ :: S’ 1 f e t :
6 tzo feet, or. a mile; therefore if 5 1 feet o f the § Iogj-
lin e A m o f f ini^', 1 mile will be run off in a,n Jjqqr;*
hence'^ as may kno,ts as are run. off in an hour, .£b many
miles the fhip fails,f in am hour. But as the fhip's run is
found to be rather more than that given by thePlo.g,..owi
ing to the lo g being drawn forward, they .generally allow
only 5 o Tfeet for a^knot; .and forae commanders allow
lefs. A n d to meafure th e time,„they have, a land glafs
which, runs qwt in .halfatuinute.
^ 485- T h e line, runs o f a reel which turns very eafily ;
and the lo g is' .thrown from the poop, or, lee .quarter j
and they generally let it run 12 or 15 fathom,/{p aa- td
be out o f the- fliip^s wake, and then begin .tp- ,couht.i
There is copnmonly fattened a piece o f red. rag-, to fiioW
where yo u are! to/bcg|n to reckon. - Care mutt be taken'
to jiave, the hopn,glaS a nd lo g line corre^, otherwise, an
allowance muft bqmade. ■v
486'. I f tfejlogjline and the. time o f the ruunihg ou^
o f 'the glafs, be b#oth altered in the'‘fame prqp ortihnHe,
number o f knots-, run out in 1 glafs jvilj. ftittihow tKei
-mimber^'nmeS-randn-um-heui^-m^f-tl^kno^be^-e'ftv
and the gfufs^ rmi'oufo»i% 24^, t^ n n±" : 30" :: 4ovft:^
50* fiJ*Tp"that 50'feet is Mil runrou-f in ha'lf'a-m'iriute. •
“ 487. In King^rifliipsV Tndia fi{fps^||S^fohre'' others,
the log- is.hove every hoiir ; but I%;.Cpatt^s*.:^ud’ tllftfe
jufihgjhort ydya^s,: e,^ryf’ t-wpd%ars.3,„ y | |
A TABLET
A B L E
r ’j I
' L A T ITU D E S m d LONG ITU D E S ' \
- •* I
PRINCIPAL PLACES'‘ON -Uj He "e ARTÖ’ sp SURF A C ^
[J .....Hanwfjofxlacfis.^__ L'CoaU.. -Sea ptCovmtry. Latitude?-; »r s , (Degrees!
dtjjidg. 1-
•H; Wat.
lAbteviHe, - " ‘ 5° 7 4 !» 4') 43*E
B h ■ ;’ " S
Bjo .7 'ä E .;
È 1 B 1
(Abo Eur. - Finlba-d- r ; ‘ 00 27 ioiW w ê i b B y f a * I '2S -54 E
: A < litm- m1 ACa Stfmatra . 5 î 2 j.95 n 1 m m ‘6 7J. i(?<E
1 Ariu-iif ire ( B i\ ) ' Afia NtijjiHolland i “ n z ? J o® g 47, 30 S :9 ‘ W 0/ E
,j Advent ure.( Ifle) A fia Pacifie ;Océ.an ^M 5. M M w i Il 0 n 11 \\
Agcle ■ Eur. Eranee ■ i a i l l ? # 5s E
• Agen ; n m France 11 12 22 N 0 36 20 E 0 2 25 E
St. Agnes ‘( l ig h t s )/1 T i i? . ' i.Sfefflks v:', 49 56 0 N J.;.# h d ,27, .4 ,W
f e g ‘ a' , <À ü a n Tbdk'- * ^ 5 '43- y f f l a f l§ '44 • 5:1*6 5 -^E
||p£|pg|$ I , £ 43 4 1 ;52 N 4 ! H i . K 1 9 4 f E
::A k ' ] -Eur. " France ,, ■48 ( 5 26 3;z ie | 0 ,2 1 '46 E
A ib y s -'Eur. Franec V : 2 j ivjfiVil, 1- 0. '!8. 33--EAleppo
<, ! Afia , T u ik e y , 1 ? i 23e#> j 2 28 4.0 E ;
'ÎAiexandrètta- i A lia : Ôÿriai 35Ä ^ 36 î , 0 _E 2 25 oiE(
l'Alexandrià [. Africa E g ypt
, A lg ie r
31 I? 2d N ..3o_, 10 i z .E . 2 - -G> 41 E
Algiers 1 f; A fr ica ' 36 ,49 3Ï Nt . 3 J2 I 0 8 j i E-
1 Ambbifc ^ ®Äir.:.„. F^ai|ctf 47 H '.'yfeNv MM^WiaaSsi i 0 ■ 3 56
BfAmbrym (Me)-’ ' 1 i t e m s Pacific Ökcean- " s 16 , f d t 12 ä ^E-- fei>ï;;i ; 2.'j;0:E'
jAm^ns.' ! >£' - i ■ j “*Eranq» : 49 53’ 43- N ; -2 17 5 6Æ I q 9 .12 E
u âtnfterda»Ç - if-'. 52 21 | f N 4 S Ï '- .gÖ b 1 0 19 26 E ; ' : f:; J .A k f e a a ^ i j l i l e ) - A ljS ; PacîfiofOcean. i * f 9’ 174/46 IIJ 39 ' 4 W -■ - 8^ 30'
Ancona 1 Eur;. .
S
' Äa!^ , 43 37 54 Ws ! i-3: * 8 E £ P 53 56 E
Angers i s p h ; ' - Î 47 28 ’9 N o- 33 ,i,y W 1 'O 2 IJ W
: Aiigbaléme. 1 M J-■ fian c e ; , ■ ( 45 3| SriHrl Î9 Ä 1-® j O O 20fE \ \