The Detroit times. [volume] (Detroit, Mich.) 1903-1920, 1916-04-05
SEMAP HOREST0
AID NAVIGATION
Two Will BE Placed In Living
stone Channel by Light
house Bureau

In order to assist vessel masters
in oheylng the new rule which re.
quires time interval Of not less
than five minutes between down
bound vessels navigating The Eiv-
ingstone channel. two semaphorc
signals installed hy the Z S light
house bureau viii be placed in oper-
alton az the opening OF navigation,
1916. the upper one being located at
Mamajuda rear lighr on the end OF
the lighthouse dock. and the lower
one being located at Livingstone
channel pier light No 2. whiSh Is
ON the west side OF the NORTH cpd
OF IA coferdam section.
each station has lead.colored
watch-house with red roof. and
white semaphorc with an arm feet
long and 10 inches wide A. night
the position Of the arm is shown by
two liked white lights. one az the
end Of the arm and swinging with
n. and the other stationary az the
pivoting point The Mamaiuda sem,
aphore rs supported on a mast with
tho arm pivoting % feet above the
base. it's lights are visible from mp.
stream only The Livingstone chan.
mol semaphore is attached 10 the
mast Of pier light No. Q. so that the
latter serves as the pivoting light.
The following directions pertain.
ing 10 the operation of the soma
phores have been formulated by Col
-MHson NJ Patrick, the U. s. engi-
neer officer in charge Of Detroit riv.
er channels
A. each station the semaphore arm
viii occupy ono 81 two positions.
either held vertically or held horizon
tally II the arm a. vertical II VIII In
dictate the way is clear. and that the
required interval ~ at least min
utes obtain between boats passing
down by the semaphore locationz II
tho arm ~ horizontal ~ VIII mean
that there is less than minutes In
terval between downhound boats.
vessel bound down observing the
Mama itida seH4aphere IN the horizon
tai position must reduce it's speed and
run under check until tho run time in
terNal 81 3 minutes between ~ and
tho preceding vessel has been gained
The distance from the Mamajuda
semaphorc 10 tho rcd gas buoy No. 2
~ tho junction ~ Fighting Island
channel and ballard Reefs channel ~
about ! As miles. After vessel has
passed down by tho Mamatuda soma
phore the interval actually existing
between ~ and a prec eding boat may
he estimated bv noting the time
which elapscR after tho vessel ahead
makes tho turn az this gas buoy until
tho vessel following arrives at the
same place.
Tho distance from Fighting Island
Reefs channel black gas hhoy No
sip. az the point where vessel
should turn into tho Livingstone
channel is about ~. miles. and the
full interval % : minutes must be
gained by he time the vessel reaches
buoy No SIP 4 II tho 5-mipute in
tervaA hhs hfep gained tHS channel
channel seuiAphore viii he clear. the
Livingstone channel scmaphorc viii
show Ia the vertical position and the
toEscl may proceed at the regulation
speed ~ 70 miles per hour No Vea-
sci shall, make the turn into Living
stone fhanrcl ~ hNqv 80. SID until
alter "a preceding vessel has PASSED
nor while tho arm 81 that ssmnphore
u IN tho horizontal position
Note. The arm of tho Livingstone
channel soma phorc viii be lowered
20 horizontal position when yea
sol passes IN and VIII ordinarily he
held IN that position for a period OF
enc minute.