Wonderful annotations under the cartouche. The arrows show the general directions of the currents which are greatly influenced by the prevailing winds. This direction of the outflow from the Swan River, during Winter months, and after heavy rains is noted thus (with a reverse arrow) also an annotation in regard to the Time Signal A ball is dropped at Arthurs Head at 1pm West Australian mean time corresponding to 17hr 0min 0 sec GMT.
One of the very first admiralty charts to show the amazing engineering works and the new State of Western Australia’s modern harbour.
