The New York herald., 1878-08-08
SCIENTIFIC NAVIGATION.
DEFENCE or CAPTAIN TRUDrLLE's SYSTEM
FOR APPROACHING SANDY HOOK AGHrsHIP
IN FoeeI WEATHER.

DEFENCE or CAPTAIN rRUDrLLEs SYSTEM
FOR ArrRoAcHrSa SANDY HOOK lGHTsHrp
IN FoeeI WEATHER.
NEW YoRa, July 80, 1878.
To TER EDITOR THE ByRALD:-
In an article published In your Issue Of the 14th
inst, entitled "scienti6c Navigation" and "Maury
or Trudelc the author OF that article give
TO Lieutenant Maury great part Of the praise which
the HERALD had 30 natteringly bestowed on Captain
TrudelIs In its OF June tor his discovery of
new plan for making Sandy Hook in thick weather.
VIII you allow Fronchman the use Of your usual
impartaiity in order to permit him 70 express his
Vows tending to render 10 his countryman what hsa
thinks belongs TO him In iull Justicef
The plan oil Lieutenant haury 10 simply q hydro
graphic done with grcat and probably with
great accuratensss, showing the dneront depths OF
water and The nature OF the bottom oil Sandy Hooks
surroundings; these data accom- panied by worry
oLce how a captain viii DO In "a constant Stress of
mind BY folio wisG Lieutenant Msury plan, having
To constantly consult The chsrt In order ascertain
at every stcp the spot whero he by anayzng
ths nature OF tho bottom ana comparing Win the
chart; without speaking OF the siniiitudc which Ia
found at III incrcni places which misIesd MIN,
this navigator ould then bs engaged IN very MI
mute Work Tor sailing ms vesscl
Tho rrudcc pian, the contrary, seems TO
cnurcly dinerept FROM Maurys ana moro accurate,
gera,ed care. II sosns 10 be foundco on the pscumrl
ties winch the thirty faihom and twcntv fathom
curves present the chart ana can be explained
few ines. Captain Trudeils says TO navigators
VINO f0uau tbomseves Ia the forty fathom line Ia
doubt IN tho reckonings sdmitted: :''Steer due
uoui you nnd the tnrty fathsm curve, here steer
south 20 deg. Of tho world until you reach the
twenty futhom line, then sicer duc north until you
nnd again tho twenty fatbom, and tncre, at q few
miles northwest Is the Ightship"
Therefore by that system the liehtship may be
MADE by the thickest weather and tnat without tho
OF any cnart or books.
As an example, 10, us suppose a steamer coming
from Europe and running cay thirteen knots, ana
using tue new sounding apparatus OF SIR w. Tnonp-
son
SOUNDING MAN aunouncss-Fsrty fnshsma
CAIIAis--5tecr duc weet.
sous DING MAs--rLirty isthorhs.
CArrAN--oteer s0uth 65 deg. OF the world.
SOUNDING MAS-rwenty fathorna
CAPrArx-Duc north
sousmsG uAy--rwcnty fsthoms.
CArrAx-Nsrtnwest Tor nve miles and anchor.
rms pan seems TO mo OF great simpeitv rs we'll
as benz very sac, having not to depend on the
ot tho oi the bottom, but only the
depth oil the water.
inc only objection, n we may call II so, is that IL
makes the ~ay longer BY three hours, bat the So
curly u al ors amply rspays Tor these additional $50
utcs on the " hole passage.
I'm CONCLUSION, desire 10 say that IL seems TO me
quite evident that the Board OF Examiners and Under
winters as we'll as the New YORK ana New Jersey
pilots wsrs perfectly riInt in recommending Csptsia
Truucle's pisn MS being "ncv.p safe and worthy
great ptaisc GASroN 4" fhNhhDENr