    Ð°Ð½ Obstetrician is a physician who has successfully completed specialized education and training in the management of pregnancy, labor, and the puerperium (the t â¦ ime-period directly following childbirth).n Obstetrician specializes in the care and treatment of pregnant women during their pregnancy, labor, delivery and the postpartum period.
Animal skins were used as sails for the earliest boats and rafts. The Egyptians and other ancient people wove reeds together in mats to make sails, but the Egyptians were also the first to make cloth sails as early as 3300 B.C. Great sailors of the Mediterranean region like the Phoenicians sailed under cloth sails.
Steam to run the engine was made by. boilers, which were giant copper tubes with. two flues and a firebox. The boiler was filled. with water, and the fire was stoked high. enough to make steam. First wood, and. then coal were used to build the fire. Most steam-powered boats shared a. similar design, but different types of boats. had different jobs.