WEEK

MONTH

7 11 3 44 4 4 2 41 3 1 6 6 6 28 11 37 11 59 7 18 7 39 11 42

1 26 1 48 9 16 9 35 1 25 1 4 2 15 2 35 7 28 7 2 11 2 34 9 54 10 13 2 7 2 2 2 56 3 17 8 10

0 32 5 23 5 4411 31 11 51 8 24 8 42 4 8 4 28
14 6

19 46 10 21 3 44 4 19 0 41 1 25 8 39 9 17

བབྱསསྐྱ ོ་

TIDAL CONSTANTS

FOR VARIOUS BRITISH, IRISH, AND EUROPEAN PORTS.

By applying the Tidal Constant of the place, according to its sign (+ add, 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.

Bantry harbour
Barnstaple bridge
Bayonne

Beachy head & Rye bay
Beaumaris

Piel harbour, Barrow
Plymouth breakwater
Poole

Port Carlisle
Portland breakwater ..
Port Patrick
Portsmouth
Ramsgate

MARINE INVENTIONS.

Monthly List of Patents-Communicated by Messrs. Wm. P. Thompson & Co., British and International Patent and Trademark Agents and Consulting Engineers, 323, High Holborn, London, W.C., and 6, Lord Street, Liverpool.

ENGLISH (APPLICATIONS).

176. James Vivian, Mylor Bridge, Cornwall. "Improvements in steam and other capstans, part of said improvements being applicable to steam winches."

198. Henry Augustus Severn, South Kensington, Middlesex. "Improvements in mariners' compasses, and in appliances used in connection therewith, for indicating deviations from the ship's true course."

258. James Harrold Barry, Pentonville Road, Middlesex, Master Mariner, R.N.R. "Improvements in apparatus for hoisting, lowering, and disengaging ships' boats."

266. Whitmore Baker, Totnes, Devon. "An improved gaff or apparatus for landing fish."

"Im

267. Ebenezer John Robertson, Ipswich, Shipbuilder. provements in or applicable to ships and vessels for lessening the effects of collision."

291.

Richard Robinson, Sunderland. "Improvements in the method of signalling on board ship, and in means or apparatus to be employed therein."

338. Francois Joseph Fortuné, Ailhaud, Paris, France. provements applicable to submarine telegraphy."

"Im

345. John Scoffern, of the Waterproof Paper Factory, Willesden Junction, Middlesex, Bachelor of Medicine. "Improvements in sheathing iron and steel ships."

G. Martorelli and N. Soliani, Spezia, Italy. "Selfacting life apparatus."

390. George Watson, Durham, Colliery Inspector. "An improved protecting coating for ships, telegraph cables, and other structures or materials."

409. Julius von Binzer and Edward Beutzen, Salzburg, Germany. "Improvements in apparatus for propelling ships and other bodies through water or air; also applicable for turbines and such like hydraulic motors."

496. Albert Marcius Silber, Wood Street, London. provements in ship and other lamps or lanterns."

"Im

"A new or

518. Frederic Williams Eichens, Paris, France. improved astronomical apparatus for assisting the navigation or direction of route of ships and other vessels, also applicable as a school apparatus."

522. Flint Ramsay, Devon House, Forest Hill, Kent, and Josiah Henry Shoebotham, Birmingham. "Improvements in sail hanks."

ABRIDGEMENTS.

2254. William Cowley, Liverpool. "Improvements in and relating to apparatus for ventilating ships and other structures or spaces." This consists in suspending a cylinder from below the deck, in which works a piston, valves opening upwards being provided in the piston and bottom of the cylinder. A pillar is let into the deck by means of a socket above the cylinder carrying the bearings for the crank shaft. This part of the apparatus above deck is entirely removable, and the holes can be plugged up. The piston is provided with a wide india-rubber flange, and the central part of the interior of the cylinder contracted in order that the rubber flange being compressed by the narrower part at each end of the stroke of the piston may always drag.

2301. Loftus Perkins, Gray's Inn Road, Middlesex. "Improvements in propellers for ships and vsssels." This consists in making the face of each blade of the propeller a screw surface. The boss occupies only a part of the length of the propeller, leaving in the rear a conical space between the end of the blades and the boss. The outer and inner edges of the blades are made parallel to each other.

2344. Noah Smith Woodward, Sherbrooke, Quebec, Canada. "An improved horn or whistle apparatus, chiefly designed for the protection of ships in foggy or stormy weather." This consists of two cylinders, held in axial position by brackets, and provided

with pistons, upon the same piston rod, the upper one being a steam cylinder, and the lower one an air cylinder. Steam being admitted into the upper cylinder below the piston, canses both pistons to ascend. The air is thus forced out of the lower cylinder through a horn or whistle provided for the purpose. By an arrangement of levers operating on a valve, the apparatus is rendered automatic, and produces sounds at regular intervals for the purpose of signalling.

2408. John Louis Lay, Paris, France. "Improvements in the construction of torpedo boats, and in apparatus to be used in connection therewith." This consists in constructing the hull of the boat in three distinct portions-a central and two side portions— to increase the stability of the boat, and also to afford better accommodation for the cable and apparatus. The movements of the boat are controlled by an electric current transmitted from the shore through the cable carried by the boat, and connected with the shore. A water chamber is provided in the hull of the boat, by filling which the boat can be submerged to prevent her capture or destruction. When it is desired to sink her, an electric current is transmitted in one direction through two electro magnets which, by a series of levers connected with the armatures of the magnets, operates upon a valve admitting gas in front of a piston, the movement of which opens an air cock. The air thus escaping allows the entrance of the water, and the boat immediately sinks. To raise her a current is sent in the opposite direction, allowing the gas to pass into the water chamber, thus expelling the water and raising the boat. A single wire serves all the purposes required for controlling the boat exclusive of firing the magazine, a series of relays, or resistance coils, being provided to direct the current to the different apparatus.

2466. William Munton Bullivant, Fenchurch Street, London. "Improvements in the manufacture of torpedo nets." This consists of working each grummet (or ropelike rings worked in steel wire) in its place in the net through rings already on two other grummets, this plan rendering the net very flexible and easily handled. The net is surrounded by a chain, each link of which is worked into it.

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