ICE - Institution of Civil Engineers - Virtual Library

80 LONGRIDGE ON WVIBE-GUNCONSTRUCTION. minutes of 18 March, 1884. Sir J. W. BAZALGETTE, C.B., President, in the Chair. (Paper No. 2958.) ``Wire-Gun Construction." By JAMES ATKI-NSON LONGRIDGE, M. Inst. C.E. INthe year 1855 the Author submitted to the Ordnance Department of that day proposals for the construction of guns by steel wire coiled upon an inner tube. These proposals were based upon experiments previously made by him, which were generally described in the Paper read before this Institutionin February 1860...

CONSTRUCTION OF HEAVY ORDNANCE. 171 February 18,1879. JAMES BRU'KLEES, VicePresident, in the Chair. NO. 1,601.-" On the Construction of Heavy Ordnance." JAMES ATKINSON LONGRIDGE,Inst. C.E.' M. By NINETEENyearsago, the Author of the presentPaperbrought beforc the Institution of Civil Engineers a communication '' On the Construction of Artillery, and other vessels, to Resist great Internal Pressure." The chief object of that Paper was, to direct attention to the principles involved in t,he construction of guns built up in successive rings, or cylinders ; or, what is another form of the same, of an internal tube, or cylinder, strengthened by successive coils of wire, put on with certaindefinite,though varying, tensions...

TAMAR BRIDGE b J. Kenneth Andem, MA., M.I.C.E. Partner. Messrs Mott, Hay & Andmon For wriiien discussion* Paper No. 6843 SYNOPSIS The Paper describes the design and construction of the new 1100-ft span suspension bridge completed in 1961 for road tra5ic over the River Tamar between Plymouthand Saltash. Reference ismade to aerodynamic considerations, the use of concrete towers, the tunnel anchorages, the use of prefabricated locked coil wire ropes for the main cables and suspenders, details of the stiffening truss and theprincipal features of the erection of this structure which was constructed in 2 years and 3 months...

TN 97 Simplification of post-tensioned concrete anchorages B. P. HUGHES, DSc,PhD, MICEMIStructE* C. I. MIDDLETON, BSC* The theoretical and economic advantages of pretensioning can be combined with the practical advantages of post-tensioning if the radial expansion of the tendons in the anchorage zones can be adequately restrained by the grout and the surrounding concrete member. This technique is now a practical proposition largely because of recentdevelopments in polymermodified and other high strength cementgrouts. In addition, improved bond between tendon and grout can be obtained by using helical coil steel reinforcement to increase restraint to the expansion of the grout in the duct, and by using 7 wire steel strand...

MATHER'S ELASTIC METALLIC PISTON. 289 Total Rain. Inchea 5 1 -30 Combs Reservoir, ,, Ridge, 720 feet above sea 1,670 ,, 35*85in.+20in. . . forevaporation=55.85 . .. A n occasional instance of less rain occurring on high land than on low land, like the one alluded to by Mr. Miller of Whitehaven, might, certainly, be met with ; but the great weight of evidence was in favour of the conclusion, that up to a certain height within the region of the clouds, the rain was greater in proportion to the greater elevation of the ground...

Proceedings.] DISCUSSION ON SUPERHEATED STEAM. 129 steam at initial pressure. As to the existence of wstcr in the Professor presence of superheated steam, he saw no difficulty i n supposing Ripper. thatwaterintheform of globules, inthe process of being evaporated, might be swept forward through the lower coils, and exist for a short period in the presence of superheated steam. This seemed to be proved by the fact that a considerable fall of temperature took place in the vertical chamber connectingthe second coil from the bottom with the top coil of the superheater, though the steam entering this chamber was highly superheated...

N10 NEWS inspection the slabs are reheated and sent through the hot strip mill where they are reduced to the required thickness-a minimum of 14 B.G. (& in.). From the hot strip mill the plate either continues its passage to the plate mill or is rolled into coils and transferred to the cold reduction mill. Here members saw the stripbeing pickled and then rolled to the required thickness-a minimum of 22 B.G. (h in.)-before being re-rolled into coils ready to be cut into sheets...

ON THE EMISSION OF HEAT BY HOT-WATER PIPES. 257 No. 1,491.--" Experimentsand Observations on the Emission ANDERSON, of Heat Hot by -Water Pipes." By WILLIAM M. Inst. C.E. PROFESSOR BALFOUR STEWART, "Elementary Treatise Heat," i n his on articles 229-235 and 255-287, gives a clear explanation of the process of cooling by radiation and convection, and quotes Dulong and Petit's formula, as modified by Hopkins, according to which the total amount of heat radiated per square foot per hour may be carried off by found by theexpression m X as (ae - l),and the heat convection in atmospheric airbythe formula 0 - 0 3 i 2 X t''2SS, in which a = 1...

Discussion on Paper No. 6843' Tamar Bridge by J. K. Anderson, M.A., M.I.C.E. Mr A. H. Toms (Research Engineer, British Railways Southern Region) wrote that during discussions with the Consultants in 1959 concerning the stability of the slope on the east side of the river in which the side-span pier was to be founded, adjacent to what was then a railway line under the jurisdiction of the Southern Region of British Railways, it was found that the epidiorite at the planned foundation level was very much more weathered than had been anticipated from the core borings, and was extensively fissured and distorted by folding and possibly faulting...

358 WORDINGHAY ON METERS ELECTRICAL FOR ENFJtGY. [Selected (Paper No. 295.) `` Meters forrecording the Consumption of Electrical Energy." By CHARLES HENRY WORDINGHAX, A.K.C., Stud. Inst. C.E. THE rapid advance that electric lighting from central stations has made during the last few years has brought the question of the construction of instruments for recordingtheenergy used by individual consumers intogreat prominence. Thesubjecthad engaged the attentionof inventors for many years previously; but the need wasnot so pressing, and, numerous ashad been the attempts, but few instruments hadpassed the experimental stage...