The New York herald. [volume] (New York [N.Y.]) 1840-1920, 1856-08-25

Probable error, minutes. ........... 4.12
Number OF differences less than Q minutcs=2
Numoof fdinerences more than min less than t=l3
10 min. .............=2
PHYSICAL SECTION.
The chair was taken by Professor Mccoy.
Professor HoGxs presented two philosophical lnstru-
mers called the ro'ascope and the gyroscops and pro
ceedcd to explsia them.
He was followed by Professor Bartlett, OF West Point
Professor Pierce, Professor Henry and others who made
several experiments with the instruments.
special committee consisting Of the following gentle.
men Professor Bachc, Chairman; Dr. Peters, Of Can
bridge Or. Jones, Of Cambridge, and Professor Chan
vene' Of Annapolis appointed a. the suggestion Of
Ioiessor Bse no b. rercrt At he next Convention upon
MI Avian Clarke new application Of the telescope 70
the meas Irement Of celestial arcs.
The next paper IN order WIS on the
APPROXIMATE ccIpAL LINES OF pirKs4I AND piugSAL
TIDES OF TIE COAST oF TIE rsTTED STATES on TIE
sYuco- ny A. D. RAcrx, SUPERINTENDENT UNITED srArs
COAST SURVEY. COMMUNICATED ny AUTHORITY TuE
TREASURY pErARTxfNT.
lAbstrsctl
This paper supplementary those on ootial Ines Of
the Atlantic and Pacific heretofore communicated
to tho association. Preparation wS made at tho last
meeting for these conclusions by presenting the type
Of the Gur cont The tides rom Cape Florida 70
t. Georges are OF the Usual type, with large daily
inequality From s. Georges 70 the mouth Of the ais
sgsippi they are OF the single day type Then the hall
day tides resppear extend beyond Galveston The day
tides recurring ~ Aranss In Texas and When
them with diurBal and semi durns wave was doscr5sd
The tide stations extend along whole coast OBJ
seryaiops are much wanted beyond Il 10 complete tho
investigation, the south side Of tho Straits Florida
the eastern coast Of tho Gulf c Mexico south Of
and especially between Cubs ard Yucatan, tho en-
trance Of the Gull from the Caibbcan
table Of tie stations at which the observations were
maie ofhe heights Ct tide (rise am l observed and
shovins the period oi son aud ,be ns ne q he
chssTyer. The first table represented diagram by
which navigator may ind tho rise and Gall OF Tie ap
proxmaely on amp part OF our Guif coast The least
oberved rise and fall At Brezos Santiago Texas and II
Zine tenths Of loot. The greatest al Cedar Keys
Florida, and is two and a hall feet. Tho tiflcul
tbs Of The problem presented by these tides
explained, removable n part by the progress Of
The labors Of Mr.. Pourtaes end other gentlemen con
ceyned In the DISCUSSION Of thee tides acknow.
edged The single day tides have NO; been 80 elaborate
~ discussed by former physicists or mathematician a.
70 prepare the vey fully for this work The formula Cor
he times given by Professor Avery IN his tides and
fsrs rcna kably in certain parts Of tho lunar month
diagram shows the general form OF the Of interval
between the moons transit and high water Advantage
taken Of the part OF the curve which changes but hs
IN ordinate 70 obtain an average hn tidal interval
,,des sposp a. the es,ss sbmsni rh"ss Ties cur
about the period OF greatest declrston CT the
these intervals, greatest defamation, vary greatly dur
the year and the form Of wing the
char ~ rrescrted deducod from observations al Key
Vest Fort Morgan Mobile enuance), and Galveston "A
yell as from san FraDcco on The Wss,era cast
a q results are remarkably regular. These annual
curves are used 10 dcduce The average number for tho
interval OF the daily tiles from short series OF cbserva
tons the limits OF uncertainty OF the process are point
ec out These intervals are merit turned into cotidai
hours by the usual process OF correcting for The dr
Of longitude, for transit for deytn and hy the pro
just described for the annual change tabe OF CO.
tidal hours FOR the various slaons Is then given ~ -
he cotdal lines are traced, The tide wave
tbem crossing 10 the entrance Of the Nssissut ana
RAISING literally 20 the western coast Of the peninsula OF
Florida from south 70 north and along the southern coast
of Upper Florida, along the eastern coast Of Iousspa
rom the souhwcct Pass ncrthward along the coast
" Mississippi Also, into the Gulf between southwest
pass and the RIO 3raDde, In suca way that Galveston
has AZ the head OF the Gulf the lstss, co,da hour. By
forming groups OF stations ss explained former papers,
he direction Of the cotda nee the couisl hour,
and the velocity ~ the waves movement roughly de-
teymined. The din cutcs OF forming the groups
planned and the general character Of the results given
BY them shown In table and upon diagram map.
Upon the nap also given the cotda hours Of the
ons and the rcenlh " the grouping Finally RON the
study Of the groups and their connection, the ooda lines
or the daily tides drawn upon the map The
rdal hour OF the northern shorc cf the Gull twenty elk
hours twenty occurring n the head OF The blight in
Which Galveston les The twenty 1--WE hour line appears
Al Gear Keys and touches the coast again a nrazos
sartaro. Twenty three r. at the ToYsugAa and Kew
weet an A nineteen II Cape Florida.
similar course 70 that Just Described IA followed In
The discussion ~ the semi diuyna tides. The table OF
stations their Positions and the other data necessary w
Obtain cttiA hcurs % given, Jhe piouon Of he SENT