RG Sommerville had 6 ships in 1876.
One of which was an old wooden paddle steamer "Asia" which formerly belonged to the Cunard company.
She was later converted to a sailing ship.
ALDERGROVE 1875 Robert Duncan & Co.Greenock & Port Glasgow
sailing ship ‘Aldergrove’ for John Robb & Co,
Greenock to charter to P Henderson & Co - details.
Greenock Advertiser 30.03.1875
The family was connected through marriage to the Birkmyre family and involved with the Newlanark Mills in 1881 but by this time the company was referred to as Somerville & Company of Port Glasgow.
Just some details I had to hand – I own one of the sites noted to above