The estimate of materials, labour and cost for the Penarth pontoon at the Swan Hunter & Wigham Richardson yard dated the 8th January 1908. Their methodology of estimating the cost of a ship or floating dock seems incredible to me given that it was produced in the days prior to calculators, electronic computers and spreadsheets etc. which we take so much for granted today. Fees, royalties commissions and margin. Somewhere I saw 4% for rivets! [062]