350
[United
vessel, on either side of it, terminating at the midshipsection in the fore-part, and in a line with the formerstern-post in the after-part. Framework is carried downto these keels, leaving a free channel for the water to runbetween them, in the direction of the midship keel. Astern-post is placed at the end of the additional keels, andupon each of them hangs a rudder.
Carpenter’s Duplex Rudder and Screw-propeller.
A screw-propeller works in an orifice in each frame-work, on the common arrangement. One of the propellersis a little more aft than the other, to allow full play toboth, and yet economise space in the mid channel.
The appearance of the vessel in the water is not alteredin the side view, neither is it much changed in the sternview.
The consequence of this new arrangement is, that therudders and propellers are acting with double effect ineach case. The rudders are receiving an increased power,because the impact of the water upon them takes place atan angle which is constrained by the situation of thekeels, and which is the most favourable that can be had.The two propellers, also, revolving as they do in waterconfined in a limited space, are working to considerableadvantage. The effect actually produced is, that, whenrequired, a vessel can be turned about in nearly half thespace that a single rudder can turn it, and the two pro-pellers will give a proportionate increase of speed.
The advantages gained by the new construction ofthe vessel are considerable. There will be more strength,more bearings in the run, and more breadth for cabinroom. The rolling and pitching will be reduced veryconsiderably. The vessel will not make leeway asformerly ; the vibration, or tremulous motion, will helessened. The safety of the vessel will be very muchincreased, because the duplex rudder will have theeffect of instantaneously changing the direction shouldshe be running into some unexpected danger ; also, if onerudder should be damaged, the other can be used to steerwith. The propellers also can be used separately whenrequired. For river navigation, the advantages obtainedby the two rudders and two propellers will jointly enablethe screw principle to be applied to steam-boats plying inshallow water, such as the Thames above London Bridge ,or to vessels having small draught of water. For trans-atlantic ships the use of the two rudders and two propel-lers will jointly ensure their making a passage in lesstime and at less expense than before, also with more cer-tainty and safety than can possibly he done by a singlescrew or paddle-wheels._
The duplex rudder is applicable to paddle wheel aswell as screw steam-boats.
195 Laurie, R. W., 8 Carlton Place, Laurieston,Glasgow —Inventor and Patentee.
Various articles for the preservation of life and propertyat sea. Buoyant mattresses, mattresses forming boats,cushions, pillows, bolsters, and portmanteaus, constructedto support from one to ten persons in water,
Life-floats and belts, self-inflating, without valves.
Model of a life-boat, fitted with self-acting valves, andtraversing shot-ballast. Should the boat, by accident,be upset, it will instantly right itself on either side, andempties itself of water in one minute. Constructed byMessrs. Forrester & Co., boat-builders, Limehouse.
Model of an apparatus, called the “ Otter , ” f° rmanoeuvring vessels at sea.
The two latter inventions are patented by the e*'-hibitor.
197 Taylor, Francis, 6 Laurie Street, Leith —Inventor and Maker.
Marine chair, that will support three persons in thewater in case of accidents at sea; it is propelled by twoshort oars.
Deck seat, capable of supporting two persons in thewater.
A portable chair or camp stool, on which two or threepersons, each of them having an air-pillow attached to thebreast, can propel themselves while in the water.
Model of a seat intended for steam-vessels, to a scaleof three inches to a foot; a seat of this construction)eight feet long, will support upwards of twenty personsin the water, seven being placed in the middle compart'ment, and the others holding on by the sides and ends.
The following models are made to a scale of one inchto a foot:—
Models of life-boats, which, if upset, will right them'selves again, on carriages for conveyance, and for launch'ing when brought to the sea.
Model of a substitute for a life-boat, seated for sixteenpersons, which may be constructed by four or five menin a few hours, if materials be at hand, viz., two logs otlight wood, or the yard of a ship cut across the middle)or a few planks of fir, and also timber for seats, &c., twolarge casks to be fastened at the extreme ends on theupper side. This, if upset, will right itself again; '*thick boards can be got, long prismatic boxes may h®made for the sides, which are much lighter than the soh asides.
Model of a life-boat for eleven persons, the framed p aI ,considered to be a ship’s fender of great length, ancarried always with the ship, the tins on the extreme endrepresenting two water-casks emptied and bunged up-.
Model of a ship’s fender; while used as such, havingthe gunwale-pieces and foot-board placed temporary 0the outside of the frame. .
Model of a substitute for a life-boat, supposed tomade of two halves of the yard of a large ship, and wiother pieces of light wood, as fir. . „
Model of a ship’s seat, to carry two persons, and havingthe oars fixed ready for using.
199 Naylor, Isaac, Monk Bretton, near Barnsley—
Inventor. j
Patent alarm-gun for the protection of property ® jgame. The number of barrels in the gun may befrom four to twenty. It will explode at intervals of tu .a minute, in all kinds of weather.
200 Wilkinson & Son, 27 Pall Mall —Manufacture!^
1. A large stanchion, or punt gun, with gun-m®^stock and spiral recoil spring, for wild-fowl shooting) jimproved principles, with loading rods and apparatus,
a moveable butt to admit of greater elevation in the . g
2. A pair of best double-barrel fowling-pieces, m^)
to reverse (i. e. either pair of barrels to fit either stowith case and apparatus complete. . t jje
3. A patent rifle with the lock on the under side i ^
whole mechanism of lock, guard, trigger, and trigg er 'P ^ c .consisting of only four pieces. Invented and mantured by the exhibitor. ta geS
4. A series of illustrations, showing the different sof the manufacture of gun-barrels:—
(a.) Horse-shoe nails, or stubs.
(b.) Old coach-springs, cut up by means of slieaiS’
(c.) Scrap stub-iron.