Frederick William Lanchester

“ The suggested ship canal from Clydebank to the Forth River is indicated in the map by the heavy line C. Apart from its strategic import, such a canal could not fail to be of great value as a commercial asset, though from that point of view alone it could not be justified to a greater extent than a mere fraction of its probable cost. Whether from a National point of view the need will justify its being carried out is a question which the future alone can determine ”

“ From the above points as centres, arcs of circles hare been struck of 400 miles radius, as indicating the probable extreme radius or limit of raid by aeroplane. It is to be understood that raids by aeroplane at so great a radius in the face of reasonably good defensive measures will rarely be pushed home, and still more rarely successful. We may take it that any point or place in or beyond this radius is to be regarded as out of the effective reach of the enemy, and points 50 or 100 miles within this as reasonably safe. ”