u of our Navy Depart- apphed which finish the ment has appreciated for surface of the model very many years the value of close to the desired shape. an experimental basin, but The model is then remov- it was for a long time una- ed from the cutting ma- ble to secure an appro- chine and finished by… … present site. The bottom of the basin pro- motion of heavy turrets on board ship. per is made up of a layer of broken stone By means of a resistance box on the ear- upon which is a thin layer of concrete; riage the current through the field coil then a half inch of Neuchatel asphalt; windings of…
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