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whom copies of this notice should be sent, please advise
me at once.

Until the conditions specified in the notice are ac-
cepted by the individuals and companies to whom
same has been addressed, the furnishing of tug service
to them will be on the alternative basis recommended
by the committee above referred to. to-wit:

"That tug boat service not in conformity therewith
(as contained in notice above) shall be furnished only
after an agreed price is arranged, based on the con-
dition of service called for and the marine risks ap-
parent to the party under whose jurisdiction the tug
service i? operated."

Respectfully,

Geo. W. Goethals,
Chairman. Isthmian Canal Commission.
President. Panama Railroad Company.



Lost— A Delta Phi Nu fraternity pin, with skull
and cross bones, ruby eyes. Return to R. L, Sommer-
ville. Pedro Miguel.



360



THE CANAL RECORD



Vol. IV., No. 45.



CANAL DIRECTORY.

ISTHMIAN CANAL COMMISSION.

Col. Geo. W. Goethals, U. S. A., Chair-
man, Culebra.

Lieut.-Col. H. F. Hodges, U. S. A., Culebra.

Lieut. -Col. D. D. Gaillard, U. S. A., Empire.

Lieut. -Col. Wm. L. Sibert, U. S. A., Gatun.

Civil Engineer H. H. Rousseau, U. S. N.,
Cultbra.

Col. W. C. Gorgas, U. S. A., Ancon.

Mr. Maurice H. Thatcher, Ancon.
Mr. Joseph Bucklin Bishop,

Secretary, Ancon.

DEPARTMENTS.



Construction and Engineering.

Headquarters. Culebra.
Col. Geo. W. Goethals, Chairman and Chief
Engineer.

William Howard May, Secretary to the
Chairman.
C. A. Mcllvaine. Chief Clerk.
John K. Baxter. Assistant Chief Clerk.
Ad. Faure. Chief Accountant.
H. S. Farish. Surveying Officer.
Caleb M. Saville. Assistant Engineer.

Lieut.-Col. H. F. Hodges, Assistant Chief
Engineer.

C. O. Carlson. Secretary.
Edward Schildhauer. Electrical and Mechanical

Engineer.
Henry Goldmark. L. D. Cornish, T. B. MOn-
niche. Designing Engineers.

Civil Engineer H. H. Rousseau, Assistant
to the Chief Engineer.

J. C. Parsons, Secretary.
Maj.T. C. Dickson, U. S. A.. Inspector of Shops.
A. B. Nichols. Office Engineer.
James G Craig. Senior Traveling Engineer.
Arthur C. Stone. D. E. Irwin. Traveling Engi-



Central Division.

Headquarters, Empire.
Lieut.-Col. D. D. Gaillard, Division Engi-
neer.

W. I Beam. Chief Clerk.
A. E- Brouk. General Inspector.
A. S. Zinn. Resident Engineer.
Mark W. Tenny, Assistant Engineer.
J. W. Suced, .Superintendent Construction
J. M. Hagan, Superintendent Construction.
Joseph Little, Superintendent Construction
W. T. Reynolds, Superintendent Construction,
A. Sessions, Superintendent Transportation,
William H Bates. Supt. Steam Shovel Repairs.
Dan E- Wright. Supt. Municipal Work and

Pipe Lines.

Atlantic Division.
Headquarters. Gatun.
Lieut.-Col. Wm. L. Sibert, Division Engi-
neer.

Maj. Chester Harding, U. S. A.. Assistant Divi-
sion Engineer.

R. M. Sands, Chief Clerk.
Maj. J. P. Jervey, U. S. A., Resident Engineer.
Maj. G. M. Hoffman. U. S. A.. Resident En-
gineer.
Geo. M. Wells. Office Engineer.

Pacific Division.

Headquarters, Corozal.
S. B. Williamson, Division Engineer.

John M. G. Watt. Assistant Division Engineer

J. C. Keller, Chief Clerk.
W. G. Comber, Resident Engineer.
H. O. Cole, Resident Engineer.
Frank Cotton. Assistant Engineer.
H. D. Hinman. Assistant Engineer.
James Macfarlane. Supt. of Dredgint:-

IVTechanical Division.

Headquarters. Gorgona.
A. L. Robinson, Superintendent.
William Taylor. Chief Clerk.

Subsistence.

Headquarters. Cristobal.
Maj . Eugene T. Wilson, U.S.A., Subsistence
Officer.

Capt. Frank O. Whitlock. U. S. A.. Assistant
Subsistence Officer.
W. F Shipley. Chief Clerk.
John Burke. Manager of Commissaries.
Quartermaster's.
Headquarters, Culebra.
Lieut.-Col. C. A. Devol, U. S. A., Chief
Quartermaster.

Capt. R. E. Wood. U. S. A.. Assistant Chief

Quartermaster.
Lieut. Walter D. Smith. U. S. A.. Constructing
Quartermaster.
C. H. Mann. Chief Clerk.



Capt. C. Nixon, U. S. A., Depot Quartermaster,
Mount Hope.

C. L- Parker, Assistant Depot Quartermaster,
Mount Hope.

Chas. R. Bryon, Storekeeper. Gatun.
R. K. Morris, Storekeeper, Gorgona.

D. H. Beaman, Storekeeper, Kmpire.
Wobert Wuerz, Storekeeper, Miraflores.
X. D. Holt, Storekeeper, Balboa.

District Quartermasters.

B. C. Poole, Ancon and Balboa.

J. H. K. Huuphreys. Corozal and Miraflores.

J. T. Smith. Pedro Miguel and Paraiso.

H. F. Sedwick. Culebra.

W. G. Ross. Empire.

J. M. King. Las Cascadas and Bas Obispo.

R. C. Shady, Gorgona.

O. S. Farrar. San Pablo, Matnei, Tabernilla

and Bohio.
K. M Gamble, Gatun.
Roy R. Watson, Cristobal and Toro Point.
Chns D. Morgan. Porto Bello and Nombie de

Dios.

Civil Administration.

Headquarters. Ancon.
Maurice H. Thatcher, Head of the Depart-
ment.

G. A. Ninas. Chief Clerk.
C. L. Luedtke, Assistant Chief Clerk.
Tom M. Cooke, Chief, Division of Posts, Cus-
toms and Revenues, Ancon.
Arthur McGown, Deputy Collector, Ancon.
Jno. L. Storla. Deputy Collector. Cristobal.
J. P. Fvffe. Chief of Police, Ancon.
Cant. Chas. W Barber, U. S. A., Assistant Chief
of Police. Ancon.

C. E. Weidman. Fire Chief. Cristobal.

Chas. F. Koerner. Assistant Fire Chief, Cris-
tobal

M. E. Gilmore. Supt. Public Works. Ancon.

F. A. Cause, Superintendent of Schools, Ancon.

Edgar P. Beck. Treasurer of Canal Zone. Empire,

W. G. Comber, Chairman: James Macfarlane.
C. J. Anderson. Board of Local Inspectors.

Canal Zone Judiciary.

Headquarters. Ancon.
Supreme Court — H. A. Gudger, Chief Justice.
Walter Emery, Clerk, Ancon.
Thomas E. Brown, Jr., Associate Justice.
Circuit Court, First Circuit— H A. Gudger.
Judge. Ancon.
Walter Emery, Clerk.

Circuit Court, Second Circuit — ( )

Elbert M. Goolsby, Clerk.
Circuit Court. Third Circuit— Thomas E
Brown. Jr.
Nelson R. Johnson. Clerk, Cristobal
William H. Jackson. Senior District Judge.

Ancon. •

M. C. Rerdell. District Judge, Cristobal.
S. E. Blackburn. District Judge. Ancon
Edgar S. Garrison. District Judge. Empire.
J. B. March. District Judge. Gorgona.



Maj. Wendell L- Simpson, U. S. A., Assistant
Purchasing Officer. 24 State Street, New York
City.

Lieut-Col. Geo. B. Davis. U. S. A.. Assistant
Purchasing Agent. 55 National Realty Build-
ing. New Orleans, La.



Law.

Headquarters. Ancon.
Frank Feuille, Counsel and Chief Attorney.
William K. Jackson. Prosecuting Attorney.
Chas, L. Williams, Assistant Prosecuting At-
torney.

Sanitation.

Headquarters, Ancon.
Col. W. C. Gorgas, Chief Sanitary Officer.

Lieut.-Col. John L. Phillips. U. S. A., Assistant

Chief Sanitary Officer.
Maj. Robert E. Noble U. S. A.. General In-
spector.
Harry E. Bovay. Chief Clerk.

Lieut.-Col. Charles F. Mason, U. S. A.. Superin-
tendent Ancon Hospital. Ancon.

Surgeon Wm. H. Bell. U. S- N., Superintendent
Colon Hospital. Cristobal.

Surgeon J. C. Perry, P. H. and M. H. S., Chief
Quarantine Officer, and Health Officer, Pan-
ama.

Surgeon Claude C. Pierce, P. H. and M. H. S.
Quarantine Officer, Colon.

Dr. Fleetwood Gruver, P. H. and M. H. S. , Quar-
antine Officer, Panama.

Joseph A. LePrince. Chief Sanitary Inspector.
Ancon.

Dr. M. E. Connor. Health Officer, Colon.



Disbursements.

Headquarters, Etnpire.
Edward J. Williams, Disbursing Officer.
W T m. M. Wood. Assistant Disbursing Officer.

Examination of Accounts.

Headquarters, Empire.
H. A. A. Smith, Examiner of Accounts.

T. L. Clear, Assistant Examiner of Accounts.



Panama Railroad Company.

Headquarters. Colon.

(General offices, 24 State Street. New York.)

J. A. Smith, General Superintendent, Colon,

R. L. Mock. Chief Clerk.
Lieut. Frederick Mears. U. S. A.. Chief Engineer.
A. K. Stone, Master of Transportation.



MOVEMENT OF OCEAN VESSELS.



Purchasing Uepartment.

Headquarters. Washington. I). C.
Capt. F. C. Boggs, U. S. A., General Pur-
chasing Officer.

C. E. Dole. Chief Clerk.

Capt. Courtland Nixon. Purchasing Agent on
the Isthmus.



The following is a list of the sailings of the Panama
Railroad Steamship Company; of the Royal Mail
Steam Packet Company; of the Hamburg-American
Line, and of the United Fruit Company's Line; the
Panama Railroad Company's dates being subject to
changes.

NEW YORK TO CRISTOBAL.

Allianca P. R. R.. . . Thursday. . . July 13

Panama P. R. R... .Wednesday July 19

Advance P. R. R... .Tuesday.. . .July 25

Colon P. R. R... .Monday July 31

Allianca P. R. R... .Saturday . . .Aug. 5

Panama P. R. R... .Saturday. . .Aug. 12

Advance P. R. R... .Friday Aug. 18

Colon P. R. R... .Thursday.. .Aug. 24

Allianca P. R. R... .Wednesday. Aug. 30

Panama P. R. R... Tuesday Sept. 5

CRISTOBAL TO NEW YORK.

Panama P. R. R... .Thursday. . .July 6

Advance P. R. R... .Wednesday July 12

Cristobal P. R. R.. . .Wednesday July 12

Colon P. R. R... .Wednesday. July 19

Allianca P. R. R... .Tuesday July 25

Panama P. R. R... .Monday July 31

Advance P. R. R.. . . Sunday .... Aug. 6

Colon P. R. R... .Saturday. . .Aug. 12

Allianca P. R. R... .Friday Aug. 18

Panama P. R. R... .Thursday.. .Aug. 24

Advance P. R. R... . Wednesday . Aug. 30

Colon P. R. R... .Tuesday Sept. 5

NEW YORK TO COLON.

Prinz Aug. Wilhelm.. .H.-A Saturday. . July 1

Santa Marta U. F. C. . .Thursday.. July 6

Prinz Sigismund H.-A Friday July 7

Clyde R. M Saturday. .July 8

Metapan U. F. C. . .Thursday.. July 13

Prinz Joachim H.-A Saturday. . July 15

Zacapa U. F. C Thursday.. July 20

Prinz Eitel Friedrich. .H.-A Friday July 21

Atrato R. M Saturday. . July 22

Almirante U. F. C. . .Thursday.. July 27

Prinz Aug. Wilhelm.. .H.-A Saturday. . July 29

Santa Marta U. F. C Thursday.. .Aug. 3

Prinz Sigismund H.-A Friday Aug. 4

Thames R. M Saturday. . .Aug. 5

COLON TO NEW YORK.

Zacapa U. F. C Thursday.. July 6

Prinz Eitel Fredrich . .H.-A Saturday. . July 8

Atrato R. M Tuesday July 11

Almirante U. F. C. . .Thursday.. July 13

Prinz Aug. Wilhelm. . . H.-A Tuesday. ... July 18

Santa Marta U. F. C. . . .Thursday. . . July 20

Prinz Sigismund H.-A Saturday . . . July 22

Thames R. M Tuesday.. . July 25

Metapan U. F. C. . .Thursday. . July 27

Prinz Joachim H.-A Tuesday Aug. 1

Zacapa U. F. C Thursday.. .Aug. 3

NEW ORLEANS TO COLON.

Turrialba U. F. C. . .Saturday .. July 1

Abangarez U. F. C Saturday. . July 8

Atenas U. F. C. . .Saturday. . July 15

Turrialba U. F. C. . .Saturday . . July 22

Abangarez U. F. C Saturday. . July 29

Atenas U. F. C Saturday. . .Aug, 5

COLON TO NEW ORLEANS.

Atenas U. F. C Thursday.. July 6

Turrialba U. F. C. . .Thursday.. July 13

Abangarez U. F. C. . .Thursday. . July 20

Atenas U. F. C. . Thursday.. July 27

Turrialba U. F. C Thursday.. .Aug. 3

Abangarez U. F. C Thursday.. .Aug. 10

Hamburg-American steamers leave Colon for New
York via Kingston at 10 a. m. on sailing dates. The
Prinz August Wilhelm and Prinz Joachim call at
Santiago de Cuba, on both outward and homeward
voyages. A ship will leave Colon for Bocas del Toro
at 5 p. m. on July 12, and August 9; and for Port.
Limon at 5 p. on July 12. July 26. and August 9.

TheLeyland line steamer William Cliff sails for New
Orleans, via Port Limon, on or about July 29.

Royal Mail steamers leave for New York on alternate
Tuesdays, at 12 noon; for Southampton on alternate
Tuesdays at 10 a. m.

United Fruit Company's ships for New Orleans
direct leave on Thursdays at 3 p. m.; ships for New
York via Kingston on Thursday at 11 a. m.; for Bocas
del Toro on Monday at 6 p. m.



CANAL




RECORD



Volume IV.



ANCON, CANAL ZONE, WEDNESDAY, JULY 12, 1911.



No. 46.



The Canal Record

Published weekly under the authority and supervision of
the Isthmian Canal Commission.

The Canal Record is issued free of charge, one copy
each, to all employes of the Commission and Panama
Railroad Company whose names are on the gold roll*
Extra copies and back numbers can be obtained from the
news stands of the Panama Railroad Company for five
cents each.

Address all Communications

THE CANAL RECORD,

Ancon, Canal Zone,

Isthmus of Panama.

No communication, either for publication or requesting
information, will receive attention unless signed with the
full name and address of the writer.

NOTES OF PROGRESS.



Slides in Culebra Cut.

On July 4, a mass of earth and soft rock
on the east side of Culebra Cut at Culebra,
immediately north of Gold Hill, fell into the
Cut, and so covered steam shovel No. 225
that only the end of the boom is sticking out
of the mass. The movement occurred early
in the morning, and no one was injured by
it. It is not known how badly the shovel was
damaged, because it is not yet freed from the
slide. Another steam shovel is excavating the
material to the end that shovel No. 225 may
be extricated.

On July 10, the mud slide on the east side
of the Cut at Las Cascadas, having become
saturated by the rain, moved into the Canal
prism, blocking all tracks on the east side of
the center drainage ditch, and thus reducing
the output from the north end of the Cut.

The total amount of material in motion,
or about to move, into Culebra Cut, does not
exceed the estimate of excavation yet to be
done there, as indicated elsewhere in this



Freshet of July 5 and 6.

On July 5 and 6, a freshet in the Chagres
River reached the following elevations:



Date.



July 5.
July 5.

July 6.

July 6.

July 7



Station.



Low

water.



Vigia 125.0

Alhajuela 92.0

Garaboa 44 .

Bohio

Gatun



Rise


Crest.


began.




A.M.


P.M.


11.30


7.00


2.10


8.00




A.M.


3.00


12.45


P.M.




s.oo


8.00




P.M.


8.00


7.00



Height.
Feet.



141.4
103.0

58.3

22.9

19.4



The estimated discharge at Alhajuela, at
the crest, was 37,200 cubic feet a second, and
at Gamboa, 34,500 cubic feet a second.



Canal Work in June.

The grand total of Canal excavation to
July 1 was 142,967,554 cubic yards, leaving
to be excavated 39,570,212 cubic yards, or
less than one-fourth of the entire amount for
the completed Canal.

The total for June was 2,646,442 cubic
yards, as compared with 2,616,609 cubic
yards in June, 1910, and 2,895,793 cubic yards



in June, 1909. All the excavation was "work
excavation," there being no "plant excava-
tion."

The dry excavation amounted to 1,588,388
cubic yards, and was principally by steam
shovels. The dredges removed 1,028,198 cubic
yards, and 29,856 cubic yards were sluiced, in
addition to the amount pumped into Gatun
Dam by suction dredges. The progress on
the locks at Gatun, Pedro Miguel, and Mira-
flores is referred to elsewhere in this issue.

In the Atlantic Division, the total excava-
tion was 516,095 cubic yards. Of this total,
63,997 cubic yards were dry excavation, and
the remainder was removed by the dredges
in the Atlantic entrance.

The total excavation in the Central Divi-
sion was 1,433,304 cubic yards, all of which
was from the prism.

In the Pacific Division, the total excavation
was 697,043 cubic yards, 522,242 cubic yards
of which were taken out by the dredges at
the Pacific entrance, and 53,858 by the
hydraulic excavation plant at Miraflores
Locks.

A detailed statement of the excavation, and
a summary of the work on the locks and
dams, follow:

ATLANTIC DIVISION.



Locality.


"Work."
Excava-
tion.


"Plant."
Excava-
tion.


Total
excava-
tion.


Dry excavation —
Locks, Dam and Spill-


Cu. yds.

4.840
59.157


Cu. yds.


Cu. yds.

4 840






59,157








Total


63,997




63.997














452.098






Locks, Dam and Spill-














Total


452,098




452 098
















Total wet and dry


516,095




516.095



CENTR.


AL DIVISION.




Dry excavation —
Culebra Cut


1.401,016




1.401.016




2.432
29,856





2.432


Wet excavation —




29,856








Total


1.433,304




1.433,304



PACIFIC DIVISION.



Dry excavation —
Locks, Dams and Spill-


45.477




45.477






Prism, south of Pedro


75,466




75 466










120,943




120.943




576,100












Total


576,100




576.100










Total wet and dry


697.043




69\043



TOTAL CANAL EXCAVATION.






1.588,388
1,058,054




1,588,388






1,058,054








Total


2,646.442




2,646.442



ally made for one of the constituent parts of the Canal ,
such as Prism. Diversions, or Locks, etc.: that is. it
represents miterial taken from the area to be occu-
pied by the Canal, and constitutes excavation useful
for the completed Canal.

By "Plant" Excavation is meant excavation outside
of any of the constituent parts of the Canal, such as
Prism, Diversions, or Locks, etc. It includes mate-
rial necessary to be excavated for construction pur-
poses only and is chargeable against the particular
plant item for which it is performed, such as Prism.
Diversions. Locks, etc.

DAM AND LOCK CONSTRUCTION.



Material.



Atlantic. Pacific



Concrete laid in locks.
Concrete laid in dams

and spillways

Fill placed in dams



Cu. yds

55.305



4.830
660,004



Ck. yds.

44,779



82,173



Total.



Cu. Yds.
100,084



4,830
742,177



Construction of Naos Island Breakwater.

During June, an average of about 1,000
cubic yards of material from Culebra Cut
was dumped on the Naos Island breakwater.
In order to complete the breakwater to the
island before the spoil available from Culebra
Cut will be exhausted, it will be necessary
to dump on an average about 3,500 cubic
yards daily. A committee has been appointed
to determine upon a method of accomplishing
this end, consisting of Messrs. S. B. William-
son, W. G. Comber, M. W. Tenny, and W. T.
Reynolds, representing the Pacific and Cen-
tral Divisions.



Draining Culebra Cut Through Pedro Miguel
Locks.

Drainage from the south end of Culebra
Cut will, henceforth, pass through the culvert
in the center wall of Pedro Miguel Locks.
Excavation was completed on July 12, con-
necting the pioneer shovel cut in the south
end of Culebra Cut with the culvert at
elevation 28 feet above sea level, 12 feet
below the bottom of the Cut. All the water
drained south from the summit between
Culebra and Empire, which heretofore has
passed through the site of Pedro Miguel
dam, will pass through the culvert, which has
a diameter of 18 feet. This will ensure quick
drainage of the Cut, and will also enable the
Pacific Division forces to complete the dam,
work on which could not be finished while
the drainage was passing through the site.



Mean rainfall along: Canal (twelve stations) 7.14
inches.

By "Work" Excavation is meant excavation actu-



Compressed Air Leakage.

A series of tests has been made of the air
mains in the Central and Pacific Divisions
to determine the amount of waste from all
causes, and the proportionate share of the
cost that should be borne by each division.
It was found that there was practically no
leakage in the main between the Rio Grande
compressor, and the beginning of the Pacific
Division lines. On June 11, a test of all the
mains and laterals showed a total loss of air
of 24.89 per cent on the basis of the output
for May, of which only 5.8 per cent was on
Pacific Division lines. At the time of the test,
the flow of air into the Pacific Division mains



362



THE CANAL RECORD



Vol. IV., No. 46.



NOTES OF PROGRESS.



(Continued.)



was measured by a meter. It has been deter-
mined to cut out all laterals for the Pacific
Division, north of the flow meter, and, since
there is practically no leakage between the
compressor plant and the meter, the propor-
tion of cost of air compressing to be borne
by the Pacific Division will be determined by
the flow through the meter.



Electric Flat-irons for Ancon Laundry.

The Ancon hospital laundry will be equipped
with electric flat-irons, replacing the ordi-
nary ones heated over gasoline burners,
now in use. They include ten 6-pound, fifteen
7-pound, and twenty 8-pound flat-irons,
aluminum finish, each fitted with a cartridge
unit, and a detachable wooden handle. In
addition, six extra cartridge units for the
6-pound irons, six for the 8-pound, 12 extra
attaching plugs for the 6-pound irons, and
12 for the 8-pound, together with 1,000 feet
of No. 12 two-conductor heater cord, have
been furnished. Current from present electric
light wires will be used. The new method
is expected to increase the efficiency of the
plant, and to lessen the operating cost.



Gatun Dam Spillway.

The concrete work in the spillway of Gatun
Dam is over 64 per cent completed, 144,193
cubic yards, out of a total of 225,000, having
been placed at the close of work on July 8.
A statement of the amount laid each working
day last week, and of the total in place,
follows:



Date.



July 3

July 4 (Holiday) .

Julys

July 6

July 7

July 8



Total

Previously reported . .



Grand total .



Concrete
Laid.



308



192
292
244
268



1,304
142.889



Hours
worked.



8.00



7.30
8.00
7.30
8.00



39.00



No.
Mixers.



Ancon Crusher.

A statement of the rock crushed at Ancon
quarry, by days, during the week ending
July 8, follows:



July 3

July 4 (Holiday).

July 5

July 6

July 7

July8



Hours
worked.



6.15



6.40
7.35
6.55
7.05



Total ! 34.30



Cubic
yards.



2,347



2,600
2,894
2,973
2.180



12.994



Additional Mixers at Mlraflores Locks.

The concrete output in the upper lock at
Miraflores will be increased by the placing in
operation, this week, of an auxiliary mixing
plant, situated in the east wall. It consists
of two 2-cubic yard mixers, formerly in use
in the east storage trestle at Pedro Miguel.
The output from this plant will be utilized
in the construction of the center wall, and
will be handled in buckets and conveyed by
the narrow-gage equipment to the chamber
cranes, which will lift it into place. The
method of transportation is similar to that
employed at Pedro Miguel, except that the
operation of the narrow-gage equipment, as
well as that of the cranes, will be confined



to the east chamber, the cantilever arms of
the latter having sufficient reach to carry on
the construction of both sides of the wall.
In building the center wall in the lower lock,
it is proposed to continue the use of the
auxiliary plant in its present position, and to
extend the narrow-gage track into the lock
by means of an incline. It is expected that
the additional mixers, when running at full



capacity, will increase the output at these
locks from 800 to 1,000 cubic yards a day.

The third berm crane at the upper lock,
completing the two on the west bank, will be
ready for operation this week. It will be
used primarily in excavating a projecting
section of the west bank at the upper end of
the lock. Seven steam shovels are now exca-
vating in the lower lock.



CONCRETE WORK IN THE LOCKS.



Over 56 per cent of the concrete for all the locks is in place, the amount at the close of
work on July 8 being 2,413,616 cubic yards, out of a total of approximately 4,284,400. A
total of 23,424 cubic yards of concrete was laid in the locks during the week ending July 8.

GATUN LOCKS.

Over 69 per cent of the concrete for the system of three twin locks at Gatun has been
laid, the amount in place at the close of the work on July 8 being 1,443,415 cubic yards, out
of a total of 2,085,000.

A statement of the amount of concrete placed in the locks each working day for the week
ending July 8, and of the total, follows; and a similar statement for the work in the spillway
of Gatun Dam is published elsewhere in this issue. The construction plant works 12 hours
daily, and the auxiliary plant 9 hours.



Date.



Construction Plant.
2-cubic yard mixers.



Auxiliary Plant.
2-cubic yard mixers.



Concrete Hours No. of Concrete Hours No. of
placed, worked, mixers placed, worked, mixers



July 3

July 4 (Holiday) . . .

July 5

July 6

July 7

July 8

* Portable mixers.



Total

Previously reported .



Grand total .



Cu. Yds
2,062



1,650
1.976
1,928
1,556



34.44



29.04

32.12
31.21
24.35



Cm.



Yds.
928



426
572
570
702

274



9.40



7.10
8.40
6.10
9.00



40.40



Cu. Yds.
1875



Large
stone.



136J

228J

276

234



Total.



Cu. Yds.
3,1771



2.212J
2.776}
2,774
2.492
274



13,706
1.429,709



1,443,415



*The 274 yards shown for the portable mixers are reinforced concrete, and were placed on the following days:
July 3d. 61J; July 5th, 61; July 6th. 48; July 7th, 55; July 8th, 48$.

PEDRO MIGUEL LOCKS.

Concrete work in the locks at Pedro Miguel is over 81 per cent completed, 679,528 cubic
yards, out of a total of 837,400, having been placed at the close of work on July 8. The record