D.DUNDAS.
To OWEN STANLEY, Esquire, Captain of her Majesty's Surveying Vessel Rattlesnake, at Plymouth, By command of their Lordships, Signed: H.G.

WARD.
...
HYDROGRAPHER'S INSTRUCTIONS.
In connection with the preceding general instructions to Captain Stanley, it will be necessary to give a portion of those more explicit directions furnished by the Hydrographer, Rear-Admiral Sir Francis Beaufort.
EXTRACTS FROM HYDROGRAPHIC INSTRUCTIONS FOR CAPTAIN STANLEY.
On your arrival at Sydney you should take the earliest opportunity of communicating with Lieutenant Yule, in order to learn how much has been executed, by the Bramble and her tender, of the orders which he received from Captain Blackwood, and you will no doubt avail yourself of his long experience in those seas in digesting your plan of future operations.
A letter from the Colonial Office having recently apprised their Lordships that it is the intention of her Majesty's Government to form a new settlement at Hervey Bay, and having requested that it may be duly examined with that view, your first undertaking, after leaving Sydney, should be to repair to that place, and to make an efficient survey of the whole bay, extending it down through the channel into Wide Bay, and marking the best anchorages, the most convenient landing-places, and the several parts where water may be found.

And as it appears that Colonel Barney, R.E.is engaged in the same inquiry, it will be prudent to act in concert with him, and to give him a copy of such parts of it as may suit his purposes.
In your way to this district, and indeed on every part of the shores of Australia, you should lose no fair opportunity of verifying the positions--of multiplying the soundings--and of improving the smaller details of the coast as laid down by Captain P.P.King in his excellent Survey, but which he had not time or means to effect with the same accuracy that will be in your power.

By carrying on this system of correction and improvement in our present charts from Hervey Bay along the narrow navigation which is generally known by the name of the Inshore Passage, between the coast and the Barrier Reefs, a very great benefit will be conferred on those masters of vessels who would be the more readily inclined to adopt that channel, if certain parts of it were so clearly delineated, and the soundings so spread on either side of the tracks, that they could sometimes continue under sail during the night.
However necessary it was, and is, to contribute as much as possible to the safety of those vessels who choose the outer voyage by the Barrier Reefs, it is not the less our duty to facilitate the navigation of the Inshore Passage to all vessels who prefer its tranquillity and security to the risk of the former; and your labours for the accomplishment of this object will prove to be of peculiar importance when steam communication between Singapore and Sydney shall be established.
In the general and searching examination of those parts of the Coral Sea which are likely to be traversed by ships steering for Torres Strait, you will be obliged to regulate your movements by the periodic changes of the weather and monsoons--probably beginning to windward, and dropping gently to leeward by close and well-arranged traverses, and by spreading out your three vessels to a convenient distance apart.

This great expanse of sea, which may be said to stretch from Lord Howe's Island to New Caledonia and to the Louisiade, would no doubt require many years work in order to accomplish that object; but, by dividing it into definite zones or squares, and by fully sifting those which you may undertake, a certain quantity of distinct knowledge will be gained.