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TIDAL CONSTANTS FOR Variots BRITISH, IRISH, AND EUROPEAN PORTS. By applying the Tidal Constant of the place, according to its sign ( + aid, - sub.), to the time of high water on the given day at the port of reference, you have the time of high water at the place sought.

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PORT OF PLACE.

CONSTANT. REFEBEXCE.

11. X Aberdeen

-1 17 Leith Aberystwyth

3 52 Liverpool Alderney...

+2 59 Brest Antwerp..

5 13 Dover Arbroath.

-0 42 Leith Arcachon

0 50 Brest Arklow

2 25 Kingstown Ayr ....

18 Greenock Banff

1 49 Leith Bantry harbour ...... -1 14 Queenstown Barnstaple bridge -O 26 Weston-s.-Mare Bayonne....

0 2 Brest Beachy head

08 Dover Beaumaris ...... -0 51 Liverpool Belfast.

+2 42 Londonderry Berwick ....

-1 5 N. Shields Blyth .............

08 N. Shields Bordeaux

3 3 Brest Boulogne .

+0 13 Dover Bridport ....

0 22 Devonport Bristol & King Road .. 0 19 Weston-s.-Mare Cadiz .....

2 2 Brest Caernarvon

1 56 Liverpool Calais

0 37 Dover Campbellton ...

-023 Greenock Cardiff .........

0 2 Weston-s.-Mare Cardigan bar..... -4 22 Liverpool Carlingford bar. - 10 Kingstown Chatham.......

-O 47 London Cherbourg .....

+4 2 Brest Coleraine ......

1 37 Londonderry Coquet Road.... - 23 N. Shields Cordouan Tower

-O 10 Brest Cowes (West).

-O 27 Dover Crinan ......

+4 41 Greenock Cromarty ...

2 21 Leith Dartmouth...

+0 33 Devonport Deal & Downs

+0 3 Dover Dieppe ....

+7 19 Brest Donaghadee ........ +0 3 Kingstown Donegal harbour ...... +0 17 Queenstown Douglas & Ramsay .... -O 11 Liverpool Dublin bar ......

+0 2 Kingstown Dundalk ........

-O 16 Kingstown Dungeness

-O 27 Dover Dunkerque....

+0 56 Dover Exmouth

+0 38 Devonport Falmouth.

-O 46 Devonport Fecamp .....

6 57 Brest Ferrol ....

0 47 Brest Flamborough head - 1 59 Hull Fleetwood ..

-O 12 Liverpool Folkestone........ -O 5 Dover Fowey ..........

- 29 Devonport Flushing ......

+1 42 Dover Galway bay ....

-O 26 Queenstown Gibraltar

-1 27 Brest Glasgow (Port).

+0 10 Greenock Gloucester .....

+2 51 Weston-s.-Mare Granville

+2 26 Brest Gravesend.

-O 48 London Grimsby (Great) ...... -O 53 Hull Guernsey (St. Peter).. 2 50 Brest Hartlepool .........

+0 5 N. Shields Harwich .....

-1 52 London Havre ......

+6 4 Brest Helgoland ..

+0 21 Dover Holyhead ...

-1 12 Liverpool Holy Island harbour .. -0 53 N. Shields Honfleur ...

+5 42 Brest Inverness ............ - 1 59 Leith

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PORT OP PLACE.

F. REFERENCE.

H. M. Jersey (St. Helier) .... +3 38 Brest Kinsale

-O 18 Queenstown Lerwick (Shetland) .. -3 47 Leith Limerick........

1 15 Queenstown Lisbon bar......

-1 17 Brest Littlehampton.

+0 24 Dover Llanelly bar ....

-0 39 Weston-s.-Mare Lowestoft ....

4 i London Lynn & Boston Deep .. -0 29 Hull Margate ....

- 2 18 London Maryport.

+0 3 Liverpool Milford Haven entr... -0 58 Weston-s.-Mare Montrose

52 Leith Morlaix

6 Brest Needles point

26 Dover Newcastle ..

+0 23 N. Shields Newhaven ...

39 Dover Newport

16 Weston-s.-Mare Nieuport..

6 Dover Nore

28 London Orfordness

2 43 London Oporto

1 17 Brest Ostende ..

+1 13 Dover Padstow ...

41 Weston-s.-Mare Peel, Isle of Man ... -O 15 Liverpool Pembroke Dock .. - 42 Weston-s.-Mare Penzance.

13 Devonport Peterhead ....

43 Leith
Piel harbour, Barrow .. 18 Liverpool
Plymouth breakwater-O 6 Devonport
Poole ..

-2 2 Dover Port Carlisle ..........

+0 47 Liverpool Portland breakwater .. +1 18 Devonport Port Patrick .

- 58 Greenock Portsmouth

+0 29 Dover Ramsgate

-2 19 London Rotterdam...

33 Dover Santander

-O 17 Brest Scarborough .

+0 48 N. Shields Selsea bill

+0 33 Dover Sheerness..

-1 21 London Shoreham ...

22 Dover Sligo bay.....

+0 17 Queenstown Southampton

-O 42 Dover Spurn point

-1 3 Hull St. Ives .......

-2 10 Weston-s.-Mare St. Malo

+2 18 Brest St. Mary (Scilly) .. -1 16 Devonport St. Nazaire..

7 Brest Stornoway .....

+6 39 Greenock Stromness (Orkneys) 17 Leith Sunderland.

- 1 N. Shields Swansea bay ...... 0 53 Weston-s.-Mare Tay bar ......

0 11 Leith Tees bar ....

+0 22 X. Shields Tenby .....

12 Weston-s.-Mare Thurso.....

49 Leith Torbay

17 Devonport Tralee bay .....

-O 58 Queenstowni Ushant (Ouessant).... 15 Brest Valentia harbour ..

19 Queenstown Waterford ........

19 Queenstown Westport...

4 Queenstown Wexford

20 Queenstown Whitby .....

29 N. Shields Whitehaven

9 Liverpool Wick.

- 2 55 Leith Wicklow .....

0 41 Kingstown Workington.

0 19 Liverpool Yarmouth road ... -4 43 London Youghall...........

+0 13 Queenstown

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MARINE INVENTIONS. Monthly List of PatentsCommunicated by Messrs. Wm. P. Thomp

son & Co., British and International Patent and Trademark Agents and Consulting Engineers, 6, Lord Street, Liverpool, and 323, High Holborn, London, W.C.

ENGLISH (APPLICATIONS). 5203. Lake Thomas, Bayswater. “Improvements in rudders."

5208. John Joseph Frederick Andrews, New Cross, Naval Architect. “Improvements in ships and vessels to render them unsinkable.”

5210. William Grise, Paris. “An undersea torpedo rocket.”

5286. James Scott and John Hutton Riddel, Glasgow, Engineers, “Improvements in the construction of anchors for ships or vessels, and in the modes and means of housing or securing them thereto.” 5298. Carl Hülster, New York. “Improvements in ships."

5319. Joseph Goodrich, — Henry, Illinois, U.S. "Improvements in mechanical movements or apparatus adapted to the propulsion of vessels, and also as a mill power, and as a blower, and to other useful purposes."

1879.

11. Thos. Robert Brailsford and Charles Wood, Trinity Square, London. “ Improvements in ships' lamps."

15. Margaret Jane Courtenay, Idlewild, Cornwall, on the Hadson, U.S. “Improved means for utilising the rise and fall of the tide as motive power."

16. Joseph Corduan, Brooklyn, U.S. “An improved method of, and apparatus for, preserving the equilibrium of beds, seats, and the like, chiefly designed to be employed in ships for the prevention of sea sickness."

67. John Davidson, Glasgow. “Improvements in' lower' or * slip' bolts for fastening the doors of houses, magazines, portboles, and other analogous purposes.”

108. Seth Whittier and Albert Rufus Whittier, Mass. “Im. provements in anchors for navigable vessels."

121. Thos. Summers and Arthur James Day, of Day, Summers & Co., of Northern Iron Works, Southampton. "Improved combination of appliances for hauling vessels on slip-ways, inclined planes, and other similar surfaces.”

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129. Herbert George Huxley, Brixton, and Moses Blok, Finsbury. “Improvements in the propulsion of marine torpedoes.”

ABRIDGEMENTS. 2047. Edmund S. Hunt, Weymouth, Mass., U.S. “Improved apparatus for use in case of shipwreck to effect communication between the wreck and the shore, and for other like purposes." Consists of a projectile comprising a powder charge, and a shot attached to a case containing a compact coil of rope packed with paraffin. A compactly finished hand coil is used in combination. The projectile is placed in the gun, and the line joining the ends of the coil in the shot case and the hand coil, is supported on a bracket so as not to lie across the muzzle of the gun, and be hurt by the explosion. The hand-coil is placed with its mouth facing the ship, the charge fired and the shot-coil flies over the ship, uncoiling itself as it proceeds.

2227. Jas. Watson and Leonard Watson, of Sunderland, Engineers. “Improvements in steam steering apparatus.” This comprises a steam cylinder bolted horizontally to a frame, and the piston rod carrying a cross head fitted with sheaves in which the tiller chains engage. V shaped slides control the admission of steam to the cylinder, the ralve is reversed by means of a twisted rocking shaft operated by the crosshead, and working the valve by an eccentric. The valve is also actuated by a handle wheel operating it by suitable gearing.

3116. Gilles Louis de Maupeon d’Ableiges, Cherbourg. “Improvements in the mode of and apparatus for removing cinders, scoriæ, clinkers, and other waste materials, from steam and other ships." This consists in sending the ashes into a hopper fitted with grinding rollers; as the stuff is ground it is mixed with water by injected jets. The stuff then falls into a pump, from which it is sucked up and discharged overboard by a reciprocating plunger, fitted with suitable valves.

FRANCE. 124994. Dressler. ' “ A construction of vessels." 124965. Jenkins. "A speed regulator for steam engines.”

124948. Joselli. “A drag."

125036. De Maupeon d'Ableiges, of Cherbourg. “An apparatus for removing coal dust from the hold of vessels."

125052. Viry. “A signal.” 125110. Vence and Constant, of La Crotat. “Jointed chairs for vessels."

125305. Stephany. “A chain boat.” 125289. Hooper. “Life rockets."

125318. Mesny. “Improved arrangements for life-belts, whereby they are rendered also available as pillows."

GERMANY. 4013. D. McColgan, San Francisco. “ An adjustable ram for ram-boats and ships."

ITALY. 2. F. Balzamo, Sorrento. “A buoy for vessels.”

24. L. Le Guénédal. “ Fixing a distress rudder in the open sea.”

44. J. L. Lay, Paris. “Improvements in torpedo boats, and An apparatus for guiding, regulating, and firing the same.”

88. G. V. Fosbery, London. “Protecting gunboats, torpedo boats, and other similar boats from bullets and other projectiles.”

121. The Chantillon and Commentry Ironworks Company, France. “ Manufacturing armour plates."

139. E. Pedcazzini, Santa Cristina, Pavia. “A steam rudder.”

136. H. Origlio and H. Carvero, Genoa. “ An apparatus for steadying rudders."

AMERICAN. 209541. Luther Alvord, South Hadley, Mass. « Chain wheel propeller and canal boat.” This consists in two wheels placed at the stern on each side, having their spokes set at an angle to their axis. The links of the chain are formed with ribs or blades set at az angle likewise. The lengths are pivoted together with eccentrically pivoted links so that the chain, though flexible in one direction, acts solidly on the water, and cannot slip on the recessed peripheries of the wheel. A baffle board at the stern can be set at an angle to project into the water, and counteract the tendency of the wheels to elevate the bow. A moveable false bow is used to

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receite and desien tie ežect of the reflex wave made by the bow of the boat. Base boards prevent the side wash from reaching the books.

257018. Samzel Ey. Cowles and Benjamin Barton Brewer, Sacramento. “Device for propelling vessels." This consists of a set of pipes cpening into the water at the stern of the vessel, two pointing forward and two aft, one on each side, and a sternward pipe. Water is pamped through pipes in the bottom furnished with suitable valves, and ejected throago the pipes to propel the vessel, controliing valves determining the action of the jets so that the vessel may be propelled and steered in various directions.

209364. Lewis Smith and Robert Booth, Sherbrooke, Quebec. “ Fog alarms." This consists of a steam cylinder, bolted over an air cylinder, provided with a fog-hom. Steam is admitted to raise the piston of the steam cylinder, and both pistons being on the same rod, fall by their own gravity on steam being cat off. A semirotary balanced shaft, with cams, operates a lever to open and close the induction valve, and the eduction valve is controlled by another lever working with a pin in the slot of the first-named lever. The shaft is revolved by the action of tappets in each cylinder-head, struck by the pistons working a pivoted arm to push it partly round each way.

209414. Jos. W. Norcross, Boston. “ Vessels." This con. sists in a peculiar vessel with two hulls, the upper part being curved like a fish's back. The bottom of each hull is angular, and projects deeper outside than between the halls, so as to take a hold of the water. Two masts are used, one in each hull, and a peculiar sail which can be shifted from one mast to the other, so as to be always set to windward; the sail is fitted to a gaff and boom pivoted centrally to the mast, and supported by rod or staff at its fore end, connecting boom and gaff together, they being pivoted to it.

78. John Brown Herreshoff and James Brown Herreshoff, Bristol, U.S. “ An improved method of propelling and steering steam vessels, and apparatus therefor and connected therewith."

100. Henry Robertson, Gosport. "Improvements in dapits for ships and other vessels."

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