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422.850

97.512

97.512



.



. 0856

.0658

.0725

1252



1.444.450 .0024

1.444.450 0020

1.444,450 .0610

1.444,450 0061



229.592

229.592

20,563

20,563

20.563

20,563

406.113

406.113



.0734
.0298
0144
0019
.4766
0691
0038
0042



305.331

305.331

23.190

23,190

23,190

23,190

529.694

529,694



0573 301.456
0229' 301.456
3.050
3.050
.4808, 3.050
0631 3.050
0023 522. 242
0012 522.242



0616
t-0080



3,5938

4991

.0026

t.0008



836,379

836.379

46.803

46.803

46,803

46,803

1.458.049

1,458.049



.0633
.0137
.0063
0008
6818
.0942
.0028
.0013



406,113 0061 529,694 .0046 522.242 t.0011 1.458.049 .0030



SO. 2333 514,178 SO. 2023 452,098 SO 2335 1,444.450 SO. 2221 406,1 13 SO 2333 529,694 $0 1509 5>2 M'SO 10S9
.0209 514,178 .0178,452.098 .0185! 1.444.450 .0191406,113 0357 529,694; .0227 522,242 0153



1,458,049 $0. 1588
1.458.049 .0237



478, 174 $0. 2542 514.178 SO. 2201 452.098 SO. 2520 1,444.450 SO. 2413 406.U3SO 2690 529.694 SO. 1736 522.242 $0 1242 1 .458.049 SO. 1825



443.625 92.77 471,658 91.73 431.655 95 48 1,346.938 93.25 1385,550 94.94 506.504 95 62 519 192 99 42
34.549 7 23 42.520 8.2?: 20.443 4,52 97.512 6 75 20,563, 5.06 23.190 4 38 3050 Sg

! I L__ ' I!



,411.246 96.79
46.8031 3.21



NOTE — *The total cost of the Dredging Plant had been absorbed at the close of April, hence no charge appears for this quarter,
flndicates credit.



STONE PRODUCTION.



Detailed cost per cubic yard for quarter ending June 30. 191 1 :



Table No. 6.



Quarrying — Quantities — cubic yards.



Stripping ,

Drilling

Blasting

Loading

Transportation

Tracks

Power

Maintenance of equipment.
Plant arbitrary



Porto Bello Quarry.



Ancon Quarry.



April.



May.



68,746



Total .



Crushing — Quantities — cubic yards .



Operation, crushers

Stone bins and conveyors. .

Power

Maintenance of equipment .
Plant arbitrary



Total

Total cost of production . . .
Towing — Quantities — <:ubic yards -



Operation, tugs and barges. .
Maintenance and equipment.
Plant arbitrary



Total

Unloading — Quantities — cubic yards.



Operation, cableways and cranes .

Power

Maintenance of equipment

Plant arbitrary



June.



Total.



April.



May.



June.



Total



60,704



187,933



58,279



58,893



62,997 ' *227,821



SO. 0259


SO. 0173


SO. 0029


SO 0158


.0375


.0376


0355


0369


.1373


.1810


1701


.1615


.0728


.0812


.0803


0778


.0613


.0693


0666


0655


.0220


.0727


0400


0436


.0197


.0244


0223


0220


.0542


. 0945


.1189


.0876


.3300


.3300


3300


3300



SO 1010
.0472
0384
0477
0956
0355



$0.0684 SO 0442 $0.0557

0515 0518 0397

.0437 .0438 0332

0437 0347 0331

.0905 0568 .0636

0268 0347 .0256



0616
2400



.0252
2400



$0.7607 I $0.9080 1 $0.8666 ' $0.8407 SO 6670 SO 5898



0324

2400



0312

.2400



$0.5384



SO. 5221



68,746



58,483



$0. 0246

.0219

.0421

.1212

1700



$0.3798



SI. 1405



68.746



SO. 0360
.0209
.0522
. 1068
. 1700



SO. 3859



60.704



187.933



58,279



58.893



62.997



227,821



SO 0266
.0165
.0476
.0939
. 1700



SO 02SS

0198

04 70

. 1079

1700



SO 0225
.0034
.0147
.0352
0740



SO. 3546



$1.2939 ' $1 2212



$0.3735 SO. 1498



SI 2142 SO. 8168



SO 0200
0051
0206
0292

0752



$0.0164 SO. 0155

0037 .0032

.0207 .0148

. 0643 0343

0747 .0737



SO. 1501 ; $0.1798 SO. 1415



SO. 7399 ' SO. 7182



$0.6636



58.483



SO. 1833
.1345
.1710



$0.1675
. 1713
. 1710



$0. 1594
.1490
.1710



SO. 488 8 $0.5098 I SO. 4794



.1706

. 1507

1710



$0.4923



68,746



58,483



SO. 1093 SO. 1086

.0184 .0212

.0627 .1180

.2070 .2070



60,704 187,933



$0. 1300
.0181
.1056
.2070



$0.1158
0192
.0937
.2070



24,115



Total

Rail transportation to storage — Quantities — cubic yards

Operation of trains SO . 0756

Repairs to tracks . 0149

Dumping in storage j

Maintenance of equipment I . 0806

Plant arbitrary



$0.3974 $0 4548 ! $0.4607 $0.4357



Total.



Division expense .



$0.1711



SO. 1107
0137



$0. 1971



21,529



SO. 0992
.0129



.0701



S0.1S22



$0.0281 $0.0307



$0.0337



Total cost in storage $2 . 1 1 48



$2.3600 I S2.2596



58.729



$0.0943
.0139



$0 0379



.0081
.0061
.0600



58.893



62,997



$0.0377
.0095
.0068
.0136
.0600



$0.0423
0023
0104
.0274
.0600



227.821



$0.0312
.0031
.0067
.0126
.0600



$0.1829 $0.1121 ! $0.1276 $0 1424



$0.1136



$0.0307 $0.0253 $0.0244 SO. 0203 $0.0184

$0.7956



$2.2379 SO. 9542 1 $0.8919 I $0.8809



.. ■ *NOTE— Under "Total Quantities" 47.652 cubic yards have been added, to adjust the difference between cross section measurements of stock pile and book
balances. This amount was not added to monthly quantities. ""*



SAND PRODUCTION.



Detailed cost per cubic yard for quarter ending June 30, 191



Table No. 7.



Items.




NOMBRE


DE DlOS.




CHAMfe.


April.


May.


June.


Total.


April.


May.


June,


Total.




47.801


40.003


24,236


112,040


36,663


35,903


38,954


tl24,372




Operation, dredges


SO. 1548
.0129


$0.2188
.0085


$0.3057
.0538


$0.2103
.0202


$0.1265
.0464


SO. 1091
.0255


$0.1170
.0338


$0.1054
0316








Total


SO. 1677


SO. 2273


$0.3595


$0.2305


$0.1729


$0.1346


$0.1508


$0.1370




Plant arbitrary


SO. 4800


$0.4800


$0.4800


$0.4800


| $0.0300


$0.0300


$0.0300


$0.0300




Total cost of production


SO. 6477


*S0.6945


$0.8395


*$0.7059


$0 2029


SO. 1646


$0. 1808


SO. 1670




47,801


40,003


24,236


112,040


36,663


35,903


38,954


124 372






Operation, tugs and barges


$0.1875
.1407
.2110


SO. 1806
.1809
.2110


$0.2380
.1707
.2110


$0.1960
.1615
.2110


$0.1213
.0653
.0700


SO. 1238
.0134
.0700


$0.1085
.0453
.0700


$0 1055


Maintenance of equipment . . .


.0373






Total


SO. 5392


SO. 5725


SO 6107


$0.5685


$0.2566


NO 2072


$0.2238


$0.2128




47,801


40,003


24,236


112,040


36,663


35,903


38.954


124,372


Operation, cableways and cranes


SO. 1114
.0162
.0571
.1620


$0 1118
.0192
.1104
.1620


SO. 1419
.0157
. 1045
.1620


$0.1181
.0172
.0864
.1620


$0.0594
.0312
.0603
.1044


$0.0620
.0308
.0417
.1040


$0.0729
.0273
.0383
.1032


$0 0582






Maintenance of equipment . . .


.0418


Plant arbitrary








Total


$0.3467


SO 4034


$0.4241


$0.3837


SI) 2553


$0.2385


$0.2417


SO 230-'


Rail Transportation to Storage — Quantities — cubic yards


12,133


17,517


11,957


41,607


36.663


35,903


38,954


124.372


Operation of trains


$0.1342
.0265


SO. 1107
.0137


$0.1034
.0134


$0.1155
.0173


$0.0487
.0275
.0065
.0079
.0800


$0.0517
.0376
.0123
.0195
.0800


$0.0473
.0423
.0131
.0311
.0800


$0.0441




Dumping in storage


0096


Maintenance of equipment. . . .


.1432


.0727


.0732


.0934


0177




.0800














Total


$0.3039


$0.1971


$0.1900


$0.2262


$0.1706


$0.2011


$0.2138


$0.1836




Division expense .


$0.0061


$0.0065


$0.0125


$0.0290


$0.0131


$0.0152


$0.0160


$0.0132






$1.6168


$1.7632


$1.9895


$1.7497


$0.8985


$0.8266


$0.8761


$0.8068





*Dry excavation is credited with $515.25 in May on account of adjustment, but no yardage was accomplished. The total cost of production includes this amount
and. for this reason, the cost of dredging, plus plant charge, does not equal total cost of production.

tNOTE. — Under "Total Quantities," 12,852 cubic yards have been added, to adjust the difference between cross section measurements of stock piles and book
balances. This amount was not added to monthly quantities.



HYDRAULIC EXCAVATION-PRISM.



Table No. 8.



Items.


Atantic Division.


Pacific Division.




April.


May.


June.


Total.


April.


May.


June.


Total.




^5,350


5,500


3.500


14,350


33,509


18,353


53,858
















$0.1794
.1060
.1175


$0.2815
.1413
.1457


$0.1036
.0949
.0731


$0.1585
.1065















$0. 1291


$0.3231


SO. 5705


So.iiii




.0997












.0772
.2614
.0678
.0230


.0923
.4482
.0785
.0336


.0771
.1919
.0608
.0146


.0798
.2584
.0661














.0076


.0142


.0318


.0161




.0206




$0. 1367
.0176


$0.3373
.0379


$0.6023
.0649


$0.3272
.0369


$0.8323
.0780


$1.2211
.1054


$0.6160
.0379






$0.7896








$0. 1543


$0.3752


$0.6672


$0.3641


$0.9103


$1.3265


$0.6539


$0.8519





MANUFACTURING CONCRETE PILES.



Table No. 9.



Items.


Atlantic Division.




April.


May.


June.


Total.


Quantities — lineal feet


10,002


5,904


5,760


21,666






$0.1024
.0750
.0178
.0358
.0334
.8584
.0922
.0053
. 1794
.0114


$0.0828
.1176
.0255
.1157
.0711
.7276
.0344
.0054
.1700
.0170


$0.0760
.1145
.0080
.0512
.0323
.6346
.0786
.0114
.1700
.0210


$0.0900
.0971
.0173
.0617
.0434
.7734
.0729
.0069
.1743
.0155




Sand










Maintenance of equipment




Division expense ....






$1.4111


$1.3671


$1.1976


$1.3525



CANAL




RECORD



Volume IV.



ANCON, CANAL ZONE, WEDNESDAY, FEBRUARY 8, 1911.



No. 24.



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 Jive
cents each.



Address all Communications

THE CANAL RECORD

A i won. Canal Zone,
Isthmus of Panama.

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

NOTES OF PROGRESS.



Gates of Gatun Locks.

The erection of a construction bridge over
Gatun Locks was begun on January 31 by
the contractors who are furnishing and erect-
ing the lock gates. The bridge will be built
over the location of the upper guard gates,
and is in two sections, one over each of the
twin lock chambers, each section being a truss
bridge 134 feet 6 inches long and 11 feet wide.
Locomotive cranes will operate over this
bridge carrying the steel for the gates from
a storage yard on the east side of the locks.



Steam Shovel Work at Mindi.

. Steam shovel work was resumed in the
Canal prism at Mindi on January 31. This
is the excavation which was flooded in the
freshet of November, 1909, when three steam
shovels were inundated. On October 24, work
was begun by suction dredges which removed
401,511 cubic yards of earth up to December
31. The dredge was removed and a dyke was
built across the entrance from the French
canal in the excavation pit, and two 12-inch
vertical centrifugal pumps, mounted on barges,
and one old French centrifugal pump, steam
driven, began the work of unwatering the pit.
On January 31, the water had been lowered to
a point where the steam shovel which was
working on the highest level could resume
excavating. Notwithstanding the Fact that
the shovels had been immersed in salt water
for more than a year, they were in such good
condition that only slight repairs were neces-
sary before, they could resume work.



Canal Work in January.

The grand total of Canal excavation to
February 1 was 129.138,400 cubic yards,
leaving to be excavated 53,399,366 cubic yards.

The total for January was 2,772,170 cubic
yards, as compared with 2,831,929 cubic yards
in January, 1910, and 2,924,551 cubic yards
in January, 1909. Of the total, 2,731,336
cubic yards were "work excavation," and
40,834 cubic yards were "plant excavation."

The dry excavation amounted to 1,734,013
cubic yards and was principally by steam



shovel. The dredges removed 1,027,485 cu-
bic yards, and 10,672 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 Miraflores is referred to elsewhere in this
issue.

In the Atlantic Division, the total excava-
tion was 624,321 cubic yards. Of this total,
65,889 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 1,614,362 cubic yards, and further
reference to this work is published elsewhere
in this issue.

In the Pacific Division, the total excavation
was 533,487 cubic yards, 379,810 cubic yards
of which were taken out by the dredges at
the Pacific entrance.

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.

65.889


Cu. Yds.


Cu. Yds.
65.889










Total


65.8S9




65 889












Locks. Dam and Spill-


520,181


35,054
3.197


555.235
3,197








Total


520. lsl


38.251


558.432


Total wet and dry


586,070


33,251


624.321



CENTRAL DIVISION.




D*y excavation —
CulebraCut


1.347,914

244.713

8.480

10.672


2,583


1.350.497
244.713


Obispo Diversion




8.480


Wet ixcavation —




10,672








Total


1.611.779


2.533


1.614,362



PACIFIC DIVISION.



Dry excavation —
Locks, Dams and Spill-


64,434












Prism, south of Pedro
















Total


64,434




64.434




379.S10
89,243




379.S10






89.243
















Total


469.053




469,053


Total wet and dry
excavation


533.487




533.487



TOTAL CANAL EXCAVATION




Dry excavation


1,731,430
999,906


2.SS3
38.251


1.734.0' 3
1,038,157


Total


2.731 .336


40.S34


2.772.170



Mean rainfall along Canal (eleven stations) 0.34
inches.

By "Work" Excavation is meant excavation actu-
ally made for one of the constituent parts of the Canal.
such as Prism. Diversions, or Locks etc.; that is, it



represents material 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.



Concrete laid in locks
Concrete laid in dams

and spillways

Fill placed in dams .



Atlantic. Pacific



Cu. Yds.
72.919



2.510
430,682



Cu. Yds.
62,531



113.928



Total.



Cu. Yds.
135,450



2.510
544,610



Record of the Ladder Dredge "Marmot."

The ladder dredge Marmot broke its own
record of a 25-day month, in January, the
output being 186,136 cubic yards of earth, as
compared with the December, 1910, record
of 183,163 cubic yards, an average output
per day, throughout the month, of 7,445.4
cubic yards, as compared with 7,326 cubic
yards per day during the month of December.
It was working in the channel to the new
dock at Balboa.

Ladder dredge outputs are figured on a
basis of a 24-hour day, as the watches are
changed every 12 hours. Delays in changing
watches, breakages, repairs, etc., reduce this
to much less than 24 hours actual dredging
time. A record of these delays has been kept
for the last two months on the Marmot, and
during the month of December, 1910, the ac-
tual dredging time was 21 hours per- day, 630
hours in all, and the rate per hour was 349
cubic yards. During January, 1911, the ac-
tual dredging time was 22.2 hours per day,
555 hours in all, and the rate per hour was
335.4 cubic yards.

The average hourly outputs of the Marmot,
actual dredging time, in December and Jan-
uary, were the highest of record in the Canal
service.

The work done by the Marmot in January
is not included in the statement of Canal
excavation given above.



Lower Lock Excavation at Miraflores.

Hydraulic operations in the lower, or south
lock, at Miraflores have been completed, with
the exception of removing the dike of earth,
which separates it from the upper lock, and
two of the eight monitors are now engaged
in washing down this barrier. In the mean-
time, preparations are under way for finish-
ing the lower lock excavation by steam
shovels; one shovel is at work making a
cut down the east bank of the Iockpit for
an incline construction track and another is
digging in ..he pit for a second construction
track.

The hydraulic giants and dredge pumps
have created an excavation approximating
the length and breadth of the lock in size,



186



THE CANAL RECORD



Vol. IV., No. 24.



NOTES OF PROGRESS.



(Continued.)



with a depth of 15 feet below mean tide; all
of the material so sluiced and removed having
been forced into the hydraulic fill of the west
dam. Rock was encountered at the present
depth of the pit, and this, together with nu-
merous beds of coarse gravel, mixed with blue
clay, which had been heaped up during the
progress of sluicing, will constitute the bal-
ance of the material to be excavated. Grav-
el was found in all parts of the lock and
the greater part of the finer quantities was
carried out by the dredge pumps. Its pres-
ence in such an unusual amount was appar-
ently due to streams, which in former times,
had their channels in this locality.

As soon as the necessary tracks can be
laid, it is proposed to set steam shovels at
work excavating for the lower lock side walls,
and in carrying out the plans for the con-
crete work, it is probable that the method
employed in building the locks at Pedro
Miguel, and of the upper lock at Miraflores,
viz., to lay the floor and culvert section be-
fore proceeding with the walls, will be reversed,
as an expeditionary measure. There is 35
feet of excavation remaining to be removed
to reach the floor of the lock, equivalent to a
total of about 350,000 cubic yards, and the
entire amount will be handled by steam
shovels. It is expected that by the time
excavation for the side walls is finished, the
berm cranes will be ready to begin the con-
crete construction.

All of the hydraulic giants, with the ex-
ception of the two noted above, are now at
work in the Canal prism, south of the lock;
three of the dredge pumps are continuing the
fill of the west dam, and the third is wastingits
output in the swamp east of the Canal, prin-
cipally pumping water to keep the pit free.
It is believed that, in addition to the soft
material, about 30 per cent of the rock in
the prism, south of the lower lock, can be
excavated hydraulically. The removal of the
rock will be effected by first blasting it, and
then sluicing the finer pieces to where the
dredge pumps can handle it. The remaining
large pieces will be removed either by steam
shovel, or by ladder dredge. The new ladder
dredge Corozal now building at Renfrew,
Scotland, will be especially fitted for this
work.

Gatun Dam Spillway.

Concrete was placed in the spillway of
Gatun Dam, during the week ending Feb-
ruary 4, as follows:



Date.


Concrete
Laid.


Hours
worked.


No.
Mixers.




162
254
216
212
78
222


8:00
8:00
8:00
8:00
9:30
9:00


2




1




1




1




2




2








1,144

114.618


50:30


1.50


Previously reported . . .






115.762





Highest January Record In Central Division.

The excavation in the Central Division for
the month of January, 1911, was 1,614,362
cubic yards, of which 1,603,299 cubic yards
were in the Canal prism, 8,480 cubic yards
on the Obispo Diversion, and 2,583 cubic
yards outside of the Canal prism. This is



much the largest January record for excava-
tion within the limits of the Central Divi-
sion since the beginning of work by the
United States. This record was made not-
withstanding the fact that there was de-
livered at Gatun from the Culebra Cut the
greatest quantity of material for use on
the Dam ever delivered in a single month
—207,498 cubic yards— the effect of the



Gatun haul being to reduce car capacity
owing to the long distance (from 23 to 25
miles) which excavated material has to be
carried before being dumped.

The next highest records for the month of
January are as follows :

Cubic Yards.

January, 1908 1,396,469

January, 1909 1,539,648

January, 1910 1,499,495



CONCRETE WORK IN THE LOCKS.



GATUN LOCKS.

Over 52 per cent of the concrete for the system of three twin locks at Gatun has been Iaid>
the exact amount in place at the close of work on February 4, being 1,087,493| cubic yards, out
of a total of 2,085,000.

A statement of the amount of concrete placed in the locks each day for the week ending
February 4, 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.


Large
stone.


Total.




Concrete Hours No. of
placed. | worked. 1 mixers


Concretel Hours
placed. 1 worked.


No. of
mixers






Cu. Yds.
2,292
2,120
2,218
2,027
2,105
2,108


38:44
36:08
38:42
35:55
34:42
37:14


6
6
6
6
6
6


Cu. Yds.
560
528
448
338
532
566
603 }


8:40
6:40
8:40
8:40
8:40
8:40


2
2
2
2
2
2


Cu. Yds.
201
233}
184f
195}
205
232}


Cu. Yds.
3,053




2.881}




2.850J




2.560}




2.842




2,906}




603}




















12,870


221:25


6


3,575}


50:00


2


1,252


17,697}




1,069, 795J






















1.087,493}



*The 603} yards shown for the portable mixers wereplaced on the following days, and of this amount, 159} yards
were reinforced concrete: January 30th, 93 yards; January 31st, 128} yards; February 1st, 90} yards; February
2d, 103 yards; February 3d, 100 yards; February 4th, 88} yards.

PEDRO MIGUEL LOCKS.

Concrete work in the locks at Pedro Miguel is over 63 per cent completed, 529,037 cubic
yards, out of a total of 837,400, having been placed at the close of work on February 4. The
record for each of the six 8-hour working days of last week, follows:







Auxiliary Plant.


Large
stone.






2-cubic yard mixers.


2-cubic yard mixers.


}-cubic yard mixer.


Total.




Concrete
placed.


Hours
worked.


No. of
mixers


Concrete

placed.


Hours
worked.


No. of

mixers


Concrete Hours
Placed. I worked.


No of
mixers.




Jan. 30. . .
Jan. 31. ..

Feb. 1

Feb. 2

Feb. 3....
Feb. 4.. ..


Cu. Yds.
1,100
1,200
1,202
1.138
1,300
1.112


14:00
15:00
14:00
14:00
15:00
12:00


2
2
2
2
2
2


Cu. Yds.
494
906
768
370
430
424


12.50
19:83
17:00
10:00
9:33
15:83


2
3
3
2
3
3


Cu. Yds.






Cu. Yds.
9
18


Cu. Yds
1,603








2,124


20
26


1:00
1:00


1

1


1,990
1,534
1,730


6


:50


. 1


2


1.544


Total
Previously


7,052


84:00


2


3.392


84:49


2.67


52


2:50


1


29

4,125


10,525
518,512
























Grand
total .


4,154


529,037



MIRAFLORES LOCKS.

About nine per cent of the concrete for the system of locks at Miraflores was in place on Feb-
ruary 4, the total amount on that date being 118,950 cubic yards, out of a total of approxim-
ately 1.362,000. The record for each of the six 8-hour working days of last week, follows:





Auxiliary Plant.




Date.


2-cubic yard mixers.


}-cubic yard mixers.


}-cubic yard mixer.


Total.




Concrete
placed.


Hours
worked.


No. of

mixers


Concrete
placed.


Hours No. of
worked. ' mixers


Concrete
placed.


Hours
worked.


No. of
mixers


Large
stone.




Jan. 30 . . .
Jan. 31...

Feb. 1

Feb. 2....
Feb. 3....
Feb. 4


Cu. Yds.
480
280
• 372
496
500
468


8:50

5:50
10:75
14:00
12:83

8:50


2
2
2
2
2
2


Cu. Yds.
427
465
313
430
319
417


24:75
27:50
21:00
23:50
23:00
24:50


4
4
3
3
3
3


Cu. Yds.
126
122
108
102
123
119


9:00
9:00
8:00
8:00
7:50