Letter from the Secretary of War, transmitting, in response to Senate resolution of February 25, 1886, letter of the Chief of Engineers relative to the condition of the Aqueduct Bridge. May 13, 1886. -- Referred to the Committee on the District of Columbia and ordered to be printed

Image 1 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 49th Congress 1st Session SENATE t Ex Doc No 138 L E T T E ii FROM THE SECRETARY OF WAR TRANSMITTING In response to Senate resolution of February 25 1886 letter…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 2 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 2 EXAMINATION OF THE AQUEDUCT BRIDGE ACROSS THE POTOMAC RIVER AT GEORGETOWN DISTRICT OF COLUMBIA United States Engineer Office Washington JD C May 4 1886 General I…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 3 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 3 Sec 4 And be it further enacted That as soon as the Chief Engineer of the Army shall certify to the Secretary of War that the…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 4 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 4 CONDITION OF THE AQUEDUBT BRIDGE canal and connect the roadway of tlie bridge with one of the streets of Georgetown Bridge street at the south end a trestle bridge connects the…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 5 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 5 FLOORBEAMS OF WEST ROADWAY No 2 rotten entirely through at end No 3 rotten 10 inches in depth at end No 5 rotten 6 inches in…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 6 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 6 CONDITION OF THE AQUEDUCT BRIDGE At 6 first and second pieces of cliord slightly rotten From 6 to 8 first piece of archrib rotten At 8 10 and 12 carriagebeams rotten…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 7 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 7 Upstream truss and arch From 2 to 4 first piece of archrib rotten fifth piece rotten entirely through At 3 5 fi 7 li and 18…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 8 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 8 CONDITION OF THE AQUEDUCT BRIDGE At 11 second piece of chord rotten inches in depth inner brace shaky and rot ten At 12 second and fourth pieces of chord rotten 3i…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 9 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 9 Upstream truss and arch From 1 to 3 first piece of chord rotten 3 inches in depth At 2 fourth piece of outer archrib rotten 4…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 10 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 I 10 CONDITION OF THE AQUEDUCT BRIDGE Upstream truss and arch At 2 first piece of outer arch rjb rotten half section second piece onethird sec tion third piece slightly rotten fifth…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 11 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 11 Horizontal distance that the top chord overhangs the lower chord at the several piers the in clination being upstream Place Georgetown abutment First pier Second pier…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 12 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 12 CONDITION OF THE AQUEDUCT BRIDGE Settlement of the archribs The superintendent states that the top of the archribs was about 3 inches below the top of the chord when first completed…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 13 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 13 Defect of arch ribsWhen constructed it was found necessary to cut the upper part of the ribs to admit the washers nuts and ends of the…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 14 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 14 CONDITION OF THE AQUEDUCT BRIDGE pairs are said to have been made since this time the work has been annually repeated It is therefore proper to recalculate the stresses which the…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 15 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 15 the truss and arch has an ultimate compressive strength of 3333 pounds per square inch and an ultimate tensile strength of 7500 pounds per square inch…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 16 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 16 CONDITION OF THE AQUEDUCT BRIDGE chord and to the tensile stress in the bottom chord in order to deter mine the entire stress in either of these chords This role recommended…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 17 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 17 panels and are inefficient or lacking in tlie first fourth fifth seventh and ninth spans and are defective in all the other spans The main braces…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 18 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 18 CONDITION OF THE AQUEDUCT BKIDGE 3 CONSIDERATION OF THE PART WHICH ARCH AND TRUSS PER FORM IN SUPPORTING THE PERMANENT AND MOVING LOADS The two systems must now be considered as…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 19 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 CONDITION OF THE AQUEDUCT BRIDGE 19 With moderate yet sufficient strength when originally constructed the aqueduct lacks crossbracing necessary to give rigidity and to re sist the tendency to revolve on its…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 20 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 4 20 CONDITION OF THE AQUEDUCT BRIDGE terials bears to the strain which can safely be brought upon them Humber one of the approved authorities on the subject for per manent load…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 21 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 S Ex _ 49 1 x Drawing A AQUEDUCT BRIDGE ACROS S THE POTOMAC RIVER AT GEORGETOWN DC SCALE I INCH 8 FEET Panel points are numbered from the Georgetown end ofspans…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 22 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138 Drawing B To aoCOrrtpanv report of Mery 4 1886 d U S Agents A Q U E D UCT BRIDGE Drawing showing framing amcL bearing DEFGHI to give rigidity to the crosssection…

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886

Image 23 of Letter from the Secretary of War, transmitting, in response to Senate resolution of …
Cited as: S. Ex. Doc. 49-138

Contributor: United States Congress. Senate - United States. War Department. Engineer Department - United States. Congress. Senate - United States. War Department - United States. Government Publishing Office - Abert, S.T., (Silvanus Thayer)
Date: 1886