<unk> <unk> <unk> <unk> <unk>  Passage: Booth was born in Gloucester, England in 1871. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ In 1889 he entered the Central Technical College, City and Guild, London after passing the entrance exam. He completed a three-year course in civil engineering and mechanical engineering under Professor William Cawthorne Unwin FRS. He completed a three-year course in civil engineering and mechanical engineering under Professor William Cawthorne Unwin FRS. He completed a three-year course in civil engineering and mechanical engineering under Professor William Cawthorne Unwin FRS. He completed the Diploma of Associateship (ACGI), coming second in the engineering department.<unk> He completed the Diploma of Associateship (ACGI), coming second in the engineering department.<unk> He completed the Diploma of Associateship (ACGI), coming second in the engineering department. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️  Question: In what area was his Diploma?
<unk> <unk> <unk>