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Патент USA US2121787

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June 28, 1938‘.
_
v E. H. DAHLGREN
_
.
2,121,787
METHOD‘ AND APPARATUS FO-R DETERMINING THE MIGRATION 0F FISH
'
Filed Nov. 25, 1956
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INVENTOR
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_ BY EDWIN H.DHHLG:REN
ATTORNEY
‘2,121,737
Patented June 28, 1938
‘
sTArE
2,121,787
METHOD AND APPARATUS FOR DETERMIN
.
ING THE MIGRATION OF FISH
Edwin H. Dahlgren, Seattle, Wash., assignor to
Government of the United States, as repre
sented by the Secretary of Commerce
Application November 23, 1936, Serial No. 112,208
4 Claims. (Cl. 175-265)
(Granted under the act of March v3, 1883, as
'
7 amended April 30, 1928; 370 0. G. 757)
and
R2
connected
through
sources of current S
.
The invention described herein may be manu- ,
to electromagnets 9 and I0 operating spring con
, factured and used byor for the Government of
the United States for governmental purposes trolled armatures II and I2 mechanically at
tached to the ejector gates 3 and 4 so that when '
without the payment to me of any royalty there
either'of the relays I and 2 is operated by the dif
U
ampli?er and selector system DAS, the
My invention relates speci?cally toa method ferential,
ejector gates 3 and 4 move to the position shown
and apparatus for determining the migration of in
dotted lines and designated 3', 4'. It is to be
?sh, but is applicable generally to the detection
understood,
however, that other means than
of the presence of any of the ferro metals.
those illustrated may be used to mechanically 10
As
previously
practiced
by
the
Bureau
of
Fish
10
or electrically operate the ejector gates 3 and 4.
cries of the United States Department of Com
merce,v migrating ?sh having been identi?ed by ' The operation of my system and method is as
on.
r
'
.
follows:
' ‘tags attached by clips to the tails, these tags
so balanced that no current ?ows in the primary 15
and unnecessary destruction of ?sh through‘in
P1 of the transformer T1. When a number'of
?sh, including one or more, bearing identi?cation ;
fection, as Well as loss of identi?cation tags due
to-the fact that the tags tear out of the ?esh.
anced so that if the ?sh passes between the coils 20
ing' of the tags to the tails causes ?esh injury
220
'
The bridge system comprising coils 5, 8, ‘I, 8 is
being recovered from the'?sh meal after the ?sh
15 are processed at the packingplants; The attach
tags passes through the conveyors or sluiceways 1'
l and 2, the impedance of the bridge is unbal
Inmy method andapparatus I insert into the
body cavities of the ?sh small ferro metal tags
bearing identifying serial numbers, the tags lye
ing between ‘thebody wall and the visceral or
6 and ,1, relay R1 is operated to open the ejector
gate 3. If the ?sh carrying themetal identi?ca
tion tag passes through the conveyor or sluiceway
2, the bridge is unbalanced so that the relay RF
is operated, opening ejector gate 4. A number of
different types of apparatus differing in details
gans, and on the recapture of the ?sh oh the ?sh
ing grounds‘electrically identify, the ?sh by the
presence of the tags,‘recovering them beforethey
are
processed.
H
'
'
of construction are known to me which will selec
'
In carryingout this method I have provided an
' apparatus, an example of which I have illustrated
tively identify the ?sh bearing the identi?cation
tags.
It is to be understood that many of thesedi?er 30
ent
detail forms of apparatus may ,be employed
I and 2 designate conveyor chutes or sluiceways.
in connection with my invention without depart
through which the ?sh are passed. The convey
ing‘ from the scope of the claims appended hereto
ors are provided with ejector gates 3 and 4 which
which are as follows:
are operated by an electrical system, such, for ex
. in the accompanying
drawing wherein numerals
ample, as an impedance bridge preferably com
prising coils 5, 6, ‘l and 8, pairs of which, 5 and 8,
"I claim:
' 1. In an apparatus for identifying ?sh bearing
metal identi?cation tags, the combination of a ‘
'l and 6, are located opposite the sluiceways so I conveyor having an ejector gate, a balanced elec
‘that the ?sh bearing the identi?cation tags may
change the impedance of the system, thus operat
40 ing the ejector gates‘ 3 and 4.
I
As illustrated, the input system for the imped
ance bridgevéomprises a transformer T coupled
to a .source of alternating current S, which ap
plies potential to the common terminals of coils
trical circuit positioned adjacent said conveyor
whereby the‘ presence of said ?sh bearing the
metal identi?cation tags unbalances said electri- ,
cal‘ circuit, and means coupling the output of said
balanced electrical circuit for operating said ejec- V
tor gate.
.
.
2. The step in the method of determining the
45 »5, 6 and 1, 8, respectively; Thejoutput of the migration of ?sh which consists in identifying
bridge coupled to the common vconnection be
?sh by inserting metallic identi?cation
tween the coils 5,1 and 6, 8, respectively, includes ' certain
pieces within the body cavities lying between the
the primary P1 of the transformer T1. 7 The sec;
ondary of the transformer T1 is a compound sec
ondary'sl, coupled in this instance to a differ
45
' body walls and the visceral organs of the ?sh.
3. The steps in the method of determining the 50
ential, ampli?er'and selector DAS, the output of _migration of ?sh which consists in identifying
which operates relays R1 and B2 mechanically certain ?sh by inserting metallic identi?cation
pieceswithin the body cavities of the ?sh and on
‘ or‘ electrically connected to the ejector gates 3
recapture
electrically segregating the ?sh bear
.and 4 in the conveyors or sluiceways ‘I and 2.»
55
In the drawing I have illustrated the relays R1 ing the metal identi?cation pieces.
55
2
>
2,121,787
4. The steps in the method of determining the
migration of ?sh which consists in identifying
certain ?sh by inserting ‘metallic identi?cation
pieces within the body cavities lying between the
Cl
body wall and the visceral organs of the ?sh and
on recapture electrically segregating the ?sh
bearing the metal identi?cation pieces by pass
ing the same through a balanced electrical sys
tem whereby the presence of the ?sh bearing the
identi?cation pieces unbalances said electrical
system.
‘
EDWIN
DAHLGREN.
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