sentences:  Trinity House then engaged him as Resident Engineer to design the Smalls Lighthouse off the coast of Pembrokeshire, his first solo project.Douglass based his plans on the proven design of John Smeaton for the third Eddystone lighthouse, which had used dovetailed granite blocks for strength.Douglass sourced his granite from the De Lank Quarries near Bodmin, Cornwall, and had it shipped to Solva on the Welsh coast where it was dressed.