Before revision: By 1808, annual production had reached 130,000 blocks and some of the equipment was still in operation as late as the mid-twentieth century.... Terry's clocks: success in wood A wooden gear from one of Terry's tall case clocks, showing the use of milled teeth .
After revision: By 1808, annual production had reached 130,000 blocks and some of the equipment was still in operation as late as the mid-twentieth century... Terry's clocks: success in wood A wooden gear from one of Terry's tall case clocks, showing the use of milled teeth .