The Sun.
London, England, 1848-07-01 00:00:00

APPOINTMENTS.

Commanders—John Steane (1846) and Cumberland
Hadaway (1846) have been appointed to study steam at
the factory, Woolwich.
Lieutenants—S. S. L. Crofton (1842), from additional
of the Howe to the Powerful, 84, at Spithead. for service
in the c.rmmund of the Rifleman, screw-tender, to the
Powerful ; C. F. Robinson, recently promoted from the
Thetis, to the Hibernia, flsg-ship in the Mediterranean.
In the Navy List of this day, this officer's name appears
only on the list of mates.
. . .

Mate—Logic) A. Whympor (acting) to the Victory,
flag-ship at Portsmouth.
Assistant Surgeons—William Hobbs (1829) to the
Ganges, 84, at the Nore ; George E. Freeman (1846) to
the Caledonia, 120, at Davenport ; William Macdonald
(1842) to the Powerful, 84, at Spichead.
Navel Cadet—J. W. Dimond to the Vengeance, 84, in
the Mediterranean.

Masters' Assistant—Henry Powell to the Medina,
steam-packet.
Clerks' Assistant—W. Miller to the Amphion, 30, at
Spithead.
Gunners—William Hall, William May, and Francis
Webster (acting) to the Ceylon, at Malta.
Boatswains —William Inglis, Thomas Allen, and Wil-
liam Blackwell, to the Ceylon; Joseph Richards (acting)
to the Illustrious.

COAST GUARD.—Messrs.Revoire, Maingay, and John
Harrison, have been appointed chief officers.
The Trafalgar, 120, Captain Charles Hope, w id
(peas-Sheerness yeaSrAiwy. She is ordered lita
in hand immediately, to have her defects repairedind to
be fitted as an advanced ship.
The Hastings, 72, Captain Morgan, is at Spithead, all
ready for sea. Mr. Southern, the minister for Rio, was
expected last evening, and the Hastings will sail to-day,
provided the wind moderates or changes. She is moat
awfully crowded with stores and supernumeraries. She
touches at Madeira on her way to Rio and Singapore.
The Vindictive, 50, at Portsmouth, has had her masts
taken out, and when there is a dock vacant she will be
taken in, examined, and prepared as an advanced ship.
Her sails, rigging, stores, and armament are to be pro-
vided, and kept ready for her.
The Southampton, 50, at Chatham, is completed, and
has been put out of dock. She is expected to be put in
commission about the 15th July.
The Ranger, 8, Commander Newland, was mustered,
and inspected, and paid advance, at Devonport yester-
day, by Rear-Admiral Superintendent Sir J. Louis;
and to-day, on the arrival of the mails, will proceed to
Ascension, calling at Madeira, Porto Grande, and Sierra
Leone.

The Crane, 6, packet-brig, Lieutenant-Commander
Parsons, arrived at Devonport on Thursday morning,
from Falmouth, to be refitted.

The Spy brigantine, paid off at Chatham on Saturday,
has been taken into dock to have her defects made
good, and to be fitted forthwith for service on the coast
of Africa.

The Tortoise lighter which sailed on Tuesday from
Devonport for Pembroke, put back on the following day,
as, in consequence of a strong head wind, she could not
get down Channel. -
The Medusa, 3, steam-packet, Lieutenant-Commander
Bathurst, is to leave Portsmouth, on Monday, for Malta,
calling at Gibraltar.
The Merlin, 3, steam-packet, Lieutenant-Commander
Turner, at Portsmouth, is not to proceed at once to
the Mediterranean. She is to proceed on the Monday
to Lisbon, and there wait further orders from the Ad-
miralty.
PORTSMOUTH, FRIDAY, FIVE P.M.—The weather
still continues squally and unsettled, with a strong breeze
from the westward, which still detains a number of
vessels at Spithead, St. Helen's, and the Motherbank.—
Herald.

THE SCREW PROPELLER.
TO THE EDITOR OF THE DIoRNING HERALD.

Sin,—An allusion having been made in your columns
yesterday, under the head of " War Steamers," to my
experiments on the lake in the Regent's Park with a
variety of propellers on the screw principle, I beg to ob-
serve that they are correctly stated—namely, " Speed of
model, with a propeller placed in the dead wood, as it is
applied to her Majesty's steam-yacht Fairy, 40 feet in
21 seconds ; speed with two propellers, one under each
quarter, wick a single vane on each propeller instead of
two, 40 feet in 13 seconds."

The plan has since been submitted to the Admiralty,
and at present I am corresponding with their Lordships
respecting it ; afterwards it is my intention to place the
model in the Polytechnic Institution, tbat any person
who takes an interest in such things may have an oppor-
tunity of seeing the experiments tried.
The novelty of the plan consists in using two pro-
pellers, one under each quarter, with a junction to the
shaft, outside, where the universal joint was applied
to the pinnace of the Geyser.
The propellers can be detached altogether, and car-
ried on the quarters, leaving the vessel with very little
imp( diment to her sailing, and without cutting away the
dead wood.

From the shafts passing outside the frame of the ves-
sel there is more room left for the stowage of the after
hold than with the dead wood propeller.
From the power being transmitted equally on both
sides of the vessel there is less vibration.

From there being two propellers, one can be used it
the other gets damaged.
From the propellers being made towards the centre of
the ves,el they are more effective in a heavy sea when
she is pitching.
From the simple arrangement of detaching and raising
the propellers out of the water they are very handy for
sailing ships as an auxiliary to the sails.
With these observations I must leave the subject till
the model is placed in the Polytechnic Institution.
I am. Sir, your obedient servant,
E. A. CARPENTER, Captain R.N.
Leamington, June 30.