Заполните пропуски предлогами by, with, for, at, in. the steam was invented james watt, who worked many years before he could make the instruments which he perfected his machine. first he worked primitive tools so he could not make his engine well-regulated. the old machine was kept going a boy who stood by it and the air means of which the steam was condensed at every revolution. this machine, though it was imperfect, some work was done and it had been used a large mine-owner (шахтовладелец) to pump out the water. the first efficient steam-engine was made a birmingham firm and it was soon every manufacturer. the revolution in industry made this machine was extremely great.

The steam was invented for James Watt, who worked is many years before he could make the instruments by which he perfekted his machine at first he worked in primitive tools so he could not make his engin well-regulated.
the old machine was kept going for a boy who stood by it and let in the air with means of which the steam was coldensed at every revolytion in this machine, tho ugh it was imperfect, some work was done and it had been used for a large mine-owner (шахтовладелец) to pump out the water. The first efficient steam-engine was madefor a Birmingham firm and it was soon used nearly every monufacturer. The revolution in industru made in this machine was extremely great.