David Noble Bertram
1852 Born in Edinburgh son of George Bertram and his wife Eliza[1]
1868 Apprenticed with George and William Bertram
1873 Worked for John Elder and Co as journeyman
1874 Became a partner of George and William Bertram
Then took charge of the works
1881 David Bertram 29, mechanical engineer, lived in Edinburgh with Mary Bertram 30, George Bertram 4, Norman Bertram 1[2]
1888 On reconstitution of the firm as a limited company, he became MD
1891 Engineer, MD of Bertrams Ltd, joined I Mech E[3]
1891 Engine & Machine Maker with Hannah Bertram 25, Norman Bertram 11, David Bertram 8, Bertram Under 1mo[4]
1901 Paper Maker's Engineer Acting Director of Ltd Company, living in Mayfield, Edinburgh with Hannah I Bertram 35, David S Bertram 18, Paper Maker's Apprentice, Dorys J Bertram 10[5]