A Bridge

An artistic shot of a one lane bridge near Brock.

Enclosed Bridge

One of the so called enclosed bridges connecting modules of the Mackenzie Chown Complex.

Exchange reactions of organic halides and organo-silicon compounds with boron tribromide and boron triiodide

Reactions of the boron halides with organic halides and organo-silicon compounds have been investigated. The results show exchange of halogens between the BX3 (X = Br# 1) and the organic halidef exchange of the halogen of the C-X bond being proved. The rates of halogen exchange vary. Reaction of the heavier halides with organo-silicon compounds indicated that the silicon-carbon bonds ruptured in the absence of electronegative atom attached to the silicon. The presence of an electronegative atom (halogen or oxygen) attached to the silicon causes the bond between the silicon and the electronegative atom to be preferentially broken. Products of exchange reactions of the boron halides and the organic halides or the organo-silicon compounds were studied by use of 1H NMR and GC/MS. From these results some possible mechanisms for the exchange reactions are postulated, but further work is indicated to prove the real courses of the reactions

Polytypism and Silicon carbide : a solid state nuclear magnetic resonance study

A survey of predominantly industrial silicon carbide has been carried out using Magic Angle Spinning nuclear magnetic resonance (MAS nmr); a solid state technique. Three silicon carbide polytypes were studied; 3C, 6H, and 15R. The 13C and 29 Si MAS nmr spectra of the bulk SiC sample was identified on the basis of silicon (carbon) site type in the d iff ere n t pol Y t Y pes • Out to 5.00 A fro mac en t r a lsi 1 i con (0 r carbon) atom four types of sites were characterized using symmetry based calculations. This method of polytype analysis was also considered, in the prelminary stages, for applications with other polytypic material; CdBr 2 , CdI 2 , and PbI 2 " In an attempt to understand the minor components of silicon carbide, such as its surface, some samples were hydrofluoric acid washed and heated to extreme temperatures. Basically, an HF removable species which absorbs at -110 ppm (Si0 2 ) in the 29 Si MAS nmr spectrum is found in silicon carbide after heating. Other unidentified peaks observed at short recycle delays in some 29 Si MAS nmr spectra are considered to be impurities that may be within the lattice. These components comprise less than 5% of the observable silicon. A Tl study was carried out for 29 Si nuclei in a 3C ii polytype sample, using the Driven Equilibrium Single-Pulse Observation of T1 (DESPOT) technique. It appears as though there are a number of nuclei that have the same chemical shift but different T1 relaxation times. The T1 values range from 30 seconds to 11 minutes. Caution has to be kept when interpreting these results because this is the first time that DESPOT has been used for solid samples and it is not likely in full working order. MAS nmr indicates that the 13C and 29 Si ~sotropic chemical shifts of silicon carbide appear to have a reciprocal type of relationship_ Single crystal nmr analysis of a 6H sample is accordance with this finding when only the resultant isotropic shift is considered. However, single crystal nmr also shows that the actual response of the silicon and carbon nuclear environment to the applied magnetic field at various angles is not at all reciprocal. Such results show that much more single crystal nmr work is required to determine the actual behavior of the local magnetic environment of the SiC nuclei.

A New guide to Niagara Falls and vicinity : giving a full and complete description of Niagara Falls, suspension bridge, Buffalo, Rochester, Ontario beach, Toronto, Lockport, Tonawanda, Lewiston, Niagara-on-the-Lake, Chautauqua, and other places of interest. --

Cover title: Illustrated guide to Niagara Falls and vicinity.

Second Welland Canal - Book 2, Survey Map 11 - Marlatts Bridge in Thorold

Survey map of the Second Welland Canal created by the Welland Canal Company showing the canal in Thorold Township. Identified structures associated with the Canal include the towing path. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include streets and roads(ex. Road to Allanburgh), Marlatt's Bridge, Marlatt's Culvert, Marlatt's Dwelling House, Willson's Dwelling House, Willson's Tannery, a flume, a bridge house, a covered drain, and a creek. Properties and property owners of note are: Lots 49, 50, and 51, Hiram Marlatt, Willson, John Kelley, and E. Hopkins.

Second Welland Canal - Book 3, Survey Map 8 - Quaker Bridge in Thorold

Survey map of the Second Welland Canal created by the Welland Canal Company showing the canal in the Thorold Township between Port Robinson and Welland. Identified structures and features associated with the Canal include the towing path, back ditch, and the waterway itself. The surveyors' measurements and notes can be seen in red and black ink and pencil. Local area landmarks are also identified and include roads and streets (ex. Road to Port Robinson), Quaker Bridge, Hagar's Wood Wharf, Spoil Bank, and several ponds. Properties and property owners of note are: Lots 222, 223, and 224, Johnathan Hagar, E. Shotwell, and Alem Marr.

Niagara Falls Suspension Bridge Company fonds, 1875-1876, 1878, 1884

In 1846, the governments of Upper Canada and the State of New York initiated the creation of two companies that would be authorized to build a bridge over the Niagara River. The bridge was to be owned by both companies, respectively known as the Niagara Falls Suspension Bridge Company (Canadian) and the International Bridge Company (American). A suspension bridge was completed in 1848. This bridge was later replaced by a second suspension bridge that accommodated railways, built in 1853-54. However, the increasing weight of trains made it necessary for the bridge to be redesigned, and a third bridge was completed in 1886. Eventually, this bridge was replaced by a steel arch bridge, which was completed in 1897.

Niagara Falls Bridge Commission Scrapbooks, 1941-1948, 1953-1963, 1965-1974

The Niagara Falls Bridge Commission was created by a joint resolution of the 1938 U.S. Congressional Third Session. The Extra Provincial Corporations Act of Ontario, Canada licenses the Niagara Falls Bridge Commission. Canada and the United States are equally represented on the Commission by an 8 member Board of Commissioners. Canadian commissioners are appointed by the Premier of Ontario. The three Niagara bridges are the Whirlpool Bridge, the Lewiston-Queenston Bridge and the Rainbow Bridge. Source:http://niagarafallsbridges.com/index.php3

Niagara Falls Bridge Commission Scrapbook and Clippings, 1948, 1950, 1954-1960

he Niagara Falls Bridge Commission was created by a joint resolution of the 1938 U.S. Congressional Third Session. The Extra Provincial Corporations Act of Ontario, Canada licenses the Niagara Falls Bridge Commission. Canada and the United States are equally represented on the Commission by an 8 member Board of Commissioners. Canadian commissioners are appointed by the Premier of Ontario. The three Niagara bridges are the Whirlpool Bridge, the Lewiston-Queenston Bridge and the Rainbow Bridge.

Report on the Niagara Railway Suspension Bridge (1892)

Final Report of John A. Roebling, Civil Engineer, to the Presidents and Directors of the Niagara Falls International Bridge Companies.

Revision of the Niagara Railway Arch Bridge (1920)

From American Society of Civil Engineers.

Report on the Condition of the Niagara Railway Suspension Bridge (1860)

Final report of John A. Roebling, Civil Engineer, to the presidents and directors of the Niagara Falls Suspension and Niagara Falls International Bridge Companies, on the condition of the Niagara Railway Suspension Bridge.