Keermelati puurimine osutus raskemaks kui algul arvasime. Tuli ette ka töid, millega ei olnud me arvestanud, nagu näiteks tappide nummerdamine ja salapulkade paigaldus. Kõige paremini õnnestus posti ja selle süvendi freesimine. Hilisemal kontrollil loodiga selgus, et post oli oodatust vertikaalsem. 17 VIIDATUD ALLIKAD 1. Geocities, „Dovetail calculator,“ [Võrgumaterjal]. Avaiable: http://www.geocities.ws/web_sketches/dovetail/DOVETAIL.html [Kasutatud 07. jaanuar, 2015] 2. Stokker, „Sõrmfrees 45° HM S=8 D=45,“ [Võrgumaterjal]. Avaiable: http://www.stokker.ee/p:2160442/loikeinstrumendid/freesterad/puit-ulafreesid/sormfrees-45- hm-s-8-d-45. [Kasutatud 07. jaanuar, 2015]. 3. Stokker, „Sõrmfrees 7° HM S=8 D=19X22,“ [Võrgumaterjal]. Avaiable: http://www.stokker
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producing centre. Pont-y-Cafnau (Bridge of Troughs) is a unique cast-iron combined aqueduct tramroad bridge below the confluence of the Taff and Taff Fechan, built in January-June 1793 by Watkin George, Chief Engineer of the Cyfarthfa Ironworks, to carry an edge railway and water channel. An iron trough-like girder is carried in an A-frame truss of cast iron spanning 47ft (14.2m), held together by mortise-and-tenon and dovetail joints. The next extant iron railway bridge seems to be another recently discovered at Aberdare (1811), followed by Gaunless. The oldest still in service is Hall's Station Bridge, a Howe truss designed in 1846 by Richard Osborne, a London-born Irishman who worked as engineer for the Philadelphia & Reading Railroad, although its current use is vehicular and not rail. The first major iron truss with pin connections was built in the USA in
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