in compression on the bottom edge and a maximum value in tension on the top with a neutral axis somewhere between the two surfaces. The problem of understanding bending moments in mechanical terms was described by Louis Marie Henri Navier in his Résumé de leçons données à l'École des Ponts et Chaussées in 1826. The Swiss mathematician Leonard Euler provided the solution to the elastic buckling of columns as early as 1759. Railroad viaducts and trestles Railroads, the transportation mode that revolutionized the 19th century, generated a bridge type that merits special attention. The limited traction of locomotives forced the railroad engineer to design the line with easy gradients. Viaducts and trestles were the engineering solution for maintaining a nearly straight and horizontal line where the depth and width of the valley or gorge rendered embankments impracticable. These massive, elevated structures were first built in Roman style of
joonised ja visandid) selliste andmetega nagu 70 - tüüp, - lubatud koormused - tootja. Teisaldatavate lasti kinnitusvahendite hulka kuuluvad - konteinerite virnastamise koonused (container stacking fittings) - konteinerivirnade ühendamise koonused (fittings for interlocking of containers) - ketid (chains), trossid (wire ropes) , vardad (rods) - talrepid (turnbuckles) ja kettide ning lintsoringute pingutusvahendid tensioners) - pukid (trestles), tungrauad (jacks) - ratastehnika kinnitusvahendid (securing gear for vehicles) - libisemisvastased materjalid (anti-skid materials). IV peatükk. Teisaldatavate kinnitusvahendite kasutamise juhend lastide ja ratastehnika kinnitamisel Peatükis kirjeldatakse teisaldatavate kinnitusvahendite ohutut kasutamist. Vajaduse korral täiendatakse kirjeldust jooniste ja visanditega. Juttu on kõigi veetavate lastide vedukite, konteinerite, aluste jne. kinnitamisest ja ohututest töövõtetest.
A commission for a statue from the Medicis was not only a great honor; it was also a task that could not be re- fused. For two years, Michelangelo searched for a block of stone out of which he could create the kind of masterpiece the Medicis were looking for. Finally, on a side street of Florence, partially overgrown with weeds and covered with dirt, he found a huge slab of marble lying on wooden trestles. It had been hauled down from the mountains years before and had never been used. Michelangelo had walked past this street many times, but this time he stopped and looked more closely. As he walked back and forth studying the block of marble, he actually envisioned the statue of David and saw it in its entirety. ■ GREAT SUCCESS REQUIRES LONG, HARD WORK
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