and was handled by the unloading cableways during the year, but they were used for transferring material from the stock piles to the tunnel hoppers and for unloading coal for use on the west side of the locks. The back filling of the side walls, made of material obtained from borrow pits, was continued until December 19, 1913, then the status of available money necessitated discontinuing further work. The amount placed during the year was 91,576 cubic yards at 1 division cost of $1.4304 per cubic yard. The total amount of material used for back fill up to June 30, 1914, aggregated 2,119,406 bic yards placed behind the side walls at a division cost of $0.5007 per cubic yard, and a total of 113,163 cubic yards placed in the center wall at a division cost of $0.7692 per cubic yard. Teams and grapers, locomotive cranes, and hand labor were used to bring the ak fill to final grade, at a cost for the year of $47,376.79. To the end of the fiscal year a total of $56,673.61 was expended on work for this Sal grading. The concrete paving of the slope between the locks and the Panama Railroad was completed during the year at a total st of $10,726.54. The lamp-posts, snubbing buttons, and mooring >sts were completed in place. The construction of the control house, an in April, 1913, was continued by the forces of the Atlantic on until October 15, 1913, when it was taken over by the first ision with other unfinished work in the Atlantic division. It was mpleted by the close of the fiscal year, with the exception of the or and window frames. The amount expended for the construcof the building, which is of reinforced concrete, tile roof and tile ors, was $54,391.60.

Gitun spillway.-Work on the spillway consisted in completing e fill of the openings of the valves in the body of the dam, raising Se piers to full height, setting the valves, and completing the bridge. far as the spillway proper is concerned, the structure was finally ished in October of 1913. During the year 7,047 cubic yards of trete were laid, at an average cost of $8.9005 per cubic yard, king the total amount of concrete placed in the structure 231,179 e yards, at an average cost of $7.5273 per cubic yard. The steps a either side and the back fill in connection with them were comted by the supply department and finished in May, 1914. Gatun Dam.-Work on the dam consisted in placing material on portions east and west of the spillway to bring the dam to full ght, in bringing the slopes generally to final grade, completing fill around and over the core wall connecting the dam with the paving the upstream slope, and in laying such permanent s as it was deemed advisable to maintain in order to make quick pairs in case of necessity. For this purpose two steam shovels -re at work until March, 1914, borrowing material from north of dam, principally red clay, and in accomplishing the grading and apletion of the fill; 314,160 cubic yards were handled at a division

H

buongioat tue year. Seepage from the dan has Le cose of the rainy seasoL TWO SMA streams p from the porti to m the west portion of the Va atiralna gf the dry season these ceased entirely. bat wagonga of any kind apparem i tis east portion of the kucao I que Lock. Masonry construction carried or a 200 g tahiti division consisted of iam-post bases. Dases for s ving valible all posts Stairway welis, and the control house. T alu Getour 1. 1915. vas taken over by the first dr.

with the concrete that was placed as ar incider La desabato of the operating machinery. The amount of 病毒 the jock structure was 2.05 cubic yards. at a divis Mus1 yʻ EZLB20 per cubic yard. including finishing and cala colorea prodousy laid: in the construction of the control bo 902 Yale at a division cost of $625125 per cubic yard. 4 1656) case yarge in connection with the installation of machine ala (12928201 Gost of $11.1862 per cubic yard. As the machinery a wiring were not all installed. additional concrete will be requi to complete the work. The total amount of concrete laid at t Peuro Miguel Looks (exclusive of that used in the construction of t control mouse) from the beginning of the work to the close of t fiscal year was 928,326 cubic yards, and the division cost was $5.65 per cause yard. Work on the control house was begun in May, 191 and was completed by the close of the year with the exception the doors, windows, and plumbing. The amount expended on t construction of the building, which is of reinforced concrete, tile ro and tile floors, was $68,521.95. The back filling of the side wal was completed in March, 1914, and the filling of the center wall i February, 1914. During the fiscal year 27,750 cubic yards of ma terial were placed behind the side walls, at a division cost of $1.114 per cubic yard, and 5,519 cubic yards in the center wall, at a division cost of $1.6139 per cubic yard. The total amount of material used for back fill up to June 30, 1914, aggregated 834,288 cubic yards placed behind the side walls, at a division cost of $0.4131 per cubic yurd and 220,76% cubic yards placed in the center wall, at a division cost of $0.4777 per cubic yard.

Miraflores Locks.-At the close of the previous fiscal year the concrete of the locks proper was completed, except the lamp-post bases, bases for snubbing buttons and mooring posts, parapets around the stairways, and the nosing at the end of the south-approach pier. During the year just ended 2,844 cubic yards of concrete were laid in the locks structure at a division cost of $20.6624 per cubic yard (including finishing and calking concrete previously laid); in the construction of the control house, 949 cubic yards at a division cost of $57.2407 per cubic yard, and 18,241 cubic yards in connection with the installation of the machinery at a division cost of $11.3685 per cubic yard. Additional concrete remained to be placed, as the installation of machinery and the wiring were not completed. The building of lamp-post bases on the southeast wing wall was interrupted by the necessity of transferring sand operations to Miraflores, and they remain to be placed. The amount of all concrete laid in the Miraflores Locks (exclusive of that used in the construction of the control house) from the beginning of the work to the close of the fiscal year was 1,507,794 cubic yards at a division cost of $5.1695 per cubic yard.

The total amount of concrete laid in the Pacific Locks (exclusive of that used in the construction of the control houses) at the close of the fiscal year aggregated 2,436,120 cubic yards at an average division cost of $5.3555 per cubic yard.

Backfilling the lock walls at Miraflores was continued, material for the west side being obtained from a borrow pit on the northwest side of Cocoli Hill and on the east side from the excavation of a hannel for discharging the overflow from the spillway into the anal, from Diablo and Sosa Hills. The backfilling of the side walls Tas completed in May, 1914, and the filling of the center wall in March, 1914. During the fiscal year 360,198 cubic yards of material Tere placed behind the side walls at a division cost of $0.6021 per bic yard, and 92,244 cubic yards in the center wall at a division st of $0.5273 per cubic yard. The total amount of material used for back fill up to June 30, 1914, was 2,366,252 cubic yards placed behind the side walls at a division cost of $0.3855 per cubic yard, and 249,457 cubic yards placed in the center wall at a division cost of $0.5846 per cubic yard.

Miraflores Dam and spillway.-During the present fiscal year the total amount of concrete laid in the spillway was 10,112 cubic yards, of which 9,570 cubic yards were plain concrete at a division cost of 1510 per cubic yard, and 542 cubic yards were reinforced concrete ta division cost of $11.8730 per cubic yard. The total amount of crete laid in the spillway to June 30, 1914, was 74,254 cubic yards ta division cost of $6.2160 per cubic yard. The last concrete was aid in February, 1914. Dry filling on the west dam was completed

19.8. and for tens

couper l te time spended the stoguementL NOCZ the time at Minatom sing antiopated by abou tvo mordes. orginal contrat proved that the sontrator should paint the g with two coats of red lead, at his expense, and with i did cour some other pigment to be furnished by the Isthmian Cazal Com sion, applied to the gates at the contractor's cost. To provide more complete protection, this agreement was modifed and at Ga arrangement was made for an additional coat, making two of lead and two others, instead of one. These additional coats consist one of United States Navy anticorrosive and one of antifoul paint, and were applied to those parts of the gates in the low locks which are constantly under water. On the remaining ga at Gatun two coats of equal parts of graphite and red lead we applied. It was intended that no red lead should be used at Ped Miguel except for the upper guard gates, the protection to consi of three coats of damp-proof paint. At Miraflores the gates in t lower lock from elevation -6 to the bottom were to be given tw conts of red lead, followed by one coat of anticorrosive and one co of antifouling paint. All the other gates were to be given thre mts of a proprietary paint consisting of a hydrocarbon mixture On count of delay in receipt of the damp-proof paints intende for us on the Pedro Miguel gates, some of these were painted with hydrocarbon paint from Miraflores and, conversely, a few of the Miraflore putes were painted with damp-proof paint. In all of these Check the third and fourth coats were applied by the Commission

forces. Due to impurities in the water of Gatun Lake, none of the paints, except the bitumastic which was applied directly to the metal on small sections of several of the gates at Gatun, has proved satisfactory, and the paint on those parts which are constantly under water is in very poor condition. The action of the gates in service entirely satisfactory, the leakage at the quoin and miter posts being extremely small. The cost of the gates complete was $6,471,6.99, of which $5,632,942.38 were paid under the contract, and the alance of $838,864.41 was for inspection, painting, recess covers, ixed steel, special tracks, and services furnished the contractor.

Gate machines.-All the parts for the mechanical and electrical nstallation of the machines for operating the miter gates were emplaced. The 40 machines required at Gatun were completed on February 28, 1914, the 24 machines at Pedro Miguel on March 28, 1914, and the 28 machines at Miraflores on May 28, 1914. A number of tests were conducted to determine the conditions under which the most satisfactory operation might be obtained, and the results btained show the advisability of reducing the duty of the motor, which has very little reserve power, by starting one gate ahead of the other by an interval of approximately 20 seconds. The benefit derived results from the fact that, with only one gate operating, when the gates are near the mitering position the entire area of the hamber is available for the storage of water displaced. The cost of the miter-gate moving machines complete was $822,410.03, of which $704,744.78 were expended under the contract, and the balance for installation.

Miter-gate forcing machines.-With the material of the miter-gate fereing machines on hand, their erection progressed with the compleon of the gates. The 20 machines required at Gatun were cometed on February 14, 1914, the 12 at Pedro Miguel were completed March 27, 1914, and the 14 at Miraflores on March 26, 1914. No perial tests were conducted during the year. The total cost of the zachines was $57,200.16, of which $40,225.88 were expended under the contract, and the balance for installation.

The machinery for operating the hand rails on the gates was insalled complete during the year. There are 36 machines at Gatun, at Pedro Miguel, and 24 at Miraflores. The operation is satisactory, both on local and remote control circuits. The total amount spended was $29,652.32, of which $17,078.58 were paid out under the contract and the balance for installation.

The installation of the pumps for unwatering the gates was comleted during the year. There are 40 pumps at Gatun, 24 at Pedro Mel, and 28 at Miraflores. The total amount expended was 516.31, of which $18,979.98 were paid out under the contract and the balance for installation.