Manual of military engineering . ~ •* •T^rfiiTr-ff^r4r;7-;;iri7r Fi(j. 2. ELe\aJLiorv To foll<ryv pbxte 79 CHAPTER XX.—FRAME BRIDGES, ETC. 113 295. When round timbers are used the groundsills and capsills Framedmust be adzed to give a square bearing surface for the trestles ofuprights. Ipund When there are two or more tiers, it will be best for the ^^ ^^upper tiers not to have groundsills. The uprights may restdirectly on the capsills of the tier below {see PI. should be wedged up after fixing ; to keep the trestletogether while it is being raised, a light timber or board maybe spik
Manual of military engineering . ~ •* •T^rfiiTr-ff^r4r;7-;;iri7r Fi(j. 2. ELe\aJLiorv To foll<ryv pbxte 79 CHAPTER XX.—FRAME BRIDGES, ETC. 113 295. When round timbers are used the groundsills and capsills Framedmust be adzed to give a square bearing surface for the trestles ofuprights. Ipund When there are two or more tiers, it will be best for the ^^ ^^upper tiers not to have groundsills. The uprights may restdirectly on the capsills of the tier below {see PI. should be wedged up after fixing ; to keep the trestletogether while it is being raised, a light timber or board maybe spiked to the sides of the uprights near their feet. 296. Formula for Use in Suspension Bridges.
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