5. The computation of distances in the polygon centering at west tower through 6 triangles differed only 15 in the seventh decimal of logarithm, and this error was distributed evenly through the triangles. To summarize, the distances depend on the length of base at Ironville, measured in feet in 1888, description of which is given in the Annual Report of the Chief of Engineers, 1890, page 2761. Its length, reduced to sea level, is 5,768.488 feet, logarithm, 3.7610620; 1,758.2193 meters, logarithm, 3.2450731, using for reduction to meters, 3.28087, logarithm. 0.5159889. Positions depend on that of Cedar Point 1877 (also used in 1888), as given in United States Lake Survey report for 1902, viz, latitude 41° 42′ 37.595"; longitude, 83° 20′ 5.834"; azimuth, Cedar Point 1877-Stony Point, 193° 28′ 7.74". A sketch on tracing cloth accompanies this report, upon which are shown the relative positions of triangulation points herein described. The results of the work are given in the following table, and the computations in detail are on file, bound together for preservation. WM. T. BLUNT, United States Assistant Engineer. Very respectfully, Lieut. Col. DAN C. KINGMAN, Corps of Engineers. a Not printed. TOLEDO HARBOR, OHIO. Table of positions, azimuths, and lengths. 314 53 41.9 211 35 55.8 31 14 08.2 6, 596. 620 3.8198215 TOLEDO HARBOR, OHIO—Continued. Table of positions, azimuths, and lengths-Continued. 24.4 165.7 1,298.9 414. 1 210.9 464.0 549.0 1, 721.4 68.4 100.1 505.7 151.0 783.6 338.1 936.4 80.4 649.5 Azimuth. O 1 "1 179 55 32.8 336 47 21.2 3 57 51.2 226 29 38.1 257 59 23.3 To station. Manhattan. .do. Rolling mill Lake Shore Lake Shore Back azi- Distance. 37 49 03.2 32 33 03.5 01 35 14.7 57 01 04.4 326 37 48.9 O 1 " 359 55 32.7 893.973 43 07 00.8 43 43 26.9 1,300. 505 223 48 03.7 757.407 52 52 17.3 829.356 105 37 11.0 971.761 352 34 01.9 85 01 44.8 1, 082.902 76 26 08.9 34 26 02.31,916. 825 Meters. Loga- Meters. 3.0046474 2.5658238 2.9905837 Distance. Loga- Feet. Feet. 3.6072437 3.6399698 3.6433508 4,667.41 3.6690760 3,447.75 3.5375358 2, 721.01 3.4347299 3.6489881 3.7385270 576.27 188.22 433.27 2,821.05 DESCRIPTION OF STATIONS. Cedar Point 1877.-United States Lake Survey primary station, described on page 434, Professional Papers, Corps of Engineers, No. 24, 1882. Used in triangulation of 1888. Washed away several years ago. Turtle Island light-house.-United States Lake Survey secondary point, given on page 799, Professional Papers, No. 24. Iron finial where it enters ball on light-house lantern, built on southerly end of brick dwelling, on Turtle Island at entrance to Maumee Bay. Eccentric station occupied is marked by a punch hole in iron platform, southwest corner, located by measurements from posts, which are shown on sketches. This light house and the island have recently been sold to private parties, the light having been discontinued. Lone tree.-On flat land, Bay Point, north side of entrance to Maumee Bay, 700 feet southerly from heavy timber. Stump of willow close to station. No surrounding points for location. Marked by rough stone monument, 6 by 6 inches by 4 feet. Triangle around hole and letters "U. S." on top. West tower.-Southwest steel tower of Bay range, Straight channel, carrying a double light. Point is finial of upper light, where it enters ball. Two eccentric stations were used at this light, one north of center and one south of center, each marked by a cross chiseled on diagonal blank smooth seam of upper square iron platform. Measurements on sketches. East tower.-Northeast steel tower, carrying one light, on axis of Straight channel in Maumee Bay. Point is finial of tower where it enters ball. Eccentric point occupied is north of center, marked by a cross chiseled on diagonal blank smooth seam of iron platform. Measurements on sketch. Toledo light-house.-Round_tower on brick dwelling, concrete superstructure over timber crib, at entrance to Maumee Bay, first lighted in 1904. Point is finial where it enters ball. Eccentric station is a cross chiseled on raised diamond of checkered iron floor on platform around lantern. This floor is in 8 sections, one joint being on line to west tower. The first joint north of this is in front of the door; the second section south of the west tower contains eccentric point nearly in its middle. Cedar Point fill.--On Cedar Point, southerly side of entrance to Maumee Bay, on sand flat formed by the shifting of Cedar Point into Maumee Bay, 527 meters west and 28 meters south from Cedar Point, 1877; marked by a 14-inch square iron rod 34 feet long with one-fourth-inch hole one-half inch deep, and letters "U.S." on top. South shore. On south shore of Maumee Bay, near Jamestown, 34 miles easterly from mouth of Maumee River, about 30 feet from shore, in heavy woods, 70 feet east from cultivated lands. Station caved away in 1905. Case.-On southerly shore of Maumee Bay, about 4,000 feet easterly from Presqu'ile at mouth of river. On land owned by Shepard, 115 feet east of property line between Shepard and Case, on line of eighth row of peach trees from property line. Marked by a 14-inch square iron rod 4 feet long, with one-fourth-inch hole one-half inch deep and letters "U. S." on top. State line.-On Dry Tree Point, west shore of Maumee Bay, 24 miles from mouth of river, one-fourth mile south of Michigan-Ohio State line. On land occupied by a dynamite factory, 150 feet northeast from inner end of trestle carrying railroad to landing. Station will probably be washed away during 1905. Point.-On Presqu'ile at mouth of river, right bank. After Station Presqu'ile caved away this station was placed farther back, but it also caved away in 1905. Middle range.-West shore of Maumee Bay, I mile from mouth of river, about 60 feet southerly from range of discontinued lights formerly carrying a red range for the old channel. On low ground made by natural fill. Station is marked by 14inch square iron rod 4 feet long with one-fourth-inch hole one-half inch deep and letters "U.S." on top. Manhattan front.--At the mouth of Maumee River, left bank, at the outer point of Bay View Park, being the front light of the Manhattan range on axis of Straight channel; square wooden tower on iron pile caps. Eccentric point used is on square lantern platform east of lantern, measurements given in sketches. Manhattan rear-Rear light of the Manhattan range, on axis of Straight channel, on edge of bank at mouth of canal at North Toledo; square wooden tower on piles. Eccentric station is east of light, on square platform. Measurements given in sketch. North base.On the right bank of Maumee River, 150 feet from bank, on cultivated land, peach orchard having been destroyed. Five-eighths of a mile below Ironville dock, operated by the Wheeling and Lake Erie Railroad Company, and on point of land between Duck Creek and the river, 750 feet above upper end of highway bridge over Duck Creek. Marked by a surface stone 6 by 6 inches by 2 feet, rough dressed on top, with a cross and letters "U. S." on top. Subsurface mark is |