AMERICAN, RAILROAD JOIfRNAL.. , _ 9411; ..... ..._...t.. .. _..... ._... _,,__,_ Q. eer. He was assisted by Col. Henry Flad, Oscar Schenltze, llicssrs. Klemm, Vat'reltnan,Scl1midt, Cooper, and Devon, with ten assistants, and Mr. C.,Sohaler Smith, ofthe Baltimore Bridge Compa- ny, ‘and Mr. Walter Katie, of the Keystone Bridge Company. Col. H. B. Carrington, United States Army, Professor of Dynamic Engineering at Wa- bash Collerze, was also present, and expressed his satisfaction at the result of the tests. At a given signal there were fourteen locomotives ready to obey the command of Captain Ends and Colonel F-lads and their assistants, -‘The Chief Engiueer’s report of the tests says: Bevan locomotives were placed upon the track of each spam.‘ This produced a dz--flection of 2% inches on centre. span, and 2% inches on each side span. Seven locomotives were then placed on rach track of the west approach, and both trains of locomotives, fourteen in all, were moved out abreast. and simultaneously over each one of the three spans. ;'I.‘ho locomotives weighed from 36 to 51 tons, 'averaging 40 tons each, making 580' tons in all. The two trains thus formed were stopped on each span, and the effects of this load carefully noted. The deflection of the middle span was 3t inches; of each side span 3 inches. The two trains moving abreast upon each arch was theseverest possible test to produce distor- tipn of the curve of each arch. Ten locomotives were’ then coupled together, and these were run oyer each track on each side of each arch of the entire bridge-,covering_=; the entire track of each span, and throwing the whole weight of the train, 400 tons, on one side of each span. This test was applied to each side of the bridge, and produced the severest twisting strain to which each arch can bé, subjected. The vertical deflection produced by this test on the central span was two and one half inches. The locomotives thus coupled were run at a speed of ten miles per hour. 'i.‘ho local traffic on the upper roadway of the bridge was nninterupted during, the progress of the tests. Various other observations in detail were made, noting the effects of the load on tho arches asit entered upon and left the spans, but this possesses no special intern t to the general public. The re- sult of the tests agrees‘ ‘almost exactly with the theoretical computations previously made, and the whole trial proved eminently satisfactory. The instruments failed to detect any side motion whatever during the tests. - Tolegrupins In Mexico.‘ The following extract in relation to the tele- graph interests of Me’-xico is taken from the re- port of_ the Department of Public Works of the Republic. to the Mexican’ Congress : Of the’ lines now in operation, some ‘belong to the-Federation, some to the States, and others to private companies. The following t9lt'gl‘aphic lines belong to the Federation: The one which starts from the City of Mexico passes tltrough Cuautitlan, Tepeji del Rio, Arroyozarco, San Juan del Rio, Queretaro, Allende. Dolores, I-Iidalgo, Elan Felipe, San Luis Potosi, Moctczuma, Charcas, Matebuala, Salado, Gomez, Farias, Saltillo, Mon terey, Cadereita Jimenez, Cerralvo Mier, Camargo; Reinosa, and-the port of Matamorase; there being a telegraph cities at each one or the twenty-three places above mentioned, and comprising a dis- tance of 1,400 kilometres in length. At Mata- moras this line connects with those of the United, States, and consequently with Europe. ‘The line which leaves Qucretaro and passes through Cele- ya,