A steel tape 30m long at a temperature of 65ºF when lying horizontally on the ground. Its sectional area is 0.082 cm2, its weight 2 kg and the co efficient of expansion 65 x10-7 per 1º F. the tape is stretched over three equal spans. Calculate the tape corrections under the following conditions at field, temperature = 85ºF, pull = 18kg, E= 2.109x106 kg/cm2