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Lords of the Admiralty as it was flattering to the compilation they had been pleased to honour with their approval, necessitated its publication. The Author felt that it would be but a doubtful proof of the attachment he feels for the service to which he belongs were he from apprehension of criticism, or feelings of false delicacy, to suppress a work which his superiors have honoured with their commendation.

In the handling of the several subjects the Author desires to express his obligations to those professional friends who have conferred upon him the benefit of their remarks on some points which he was permitted to bring under their personal notice.

In using certain expressions, such as “ought,” “should,” &c., the Author is anxious to disclaim anything approaching to a tone imperious or dictatorial. He does not affect to prescribe to any what should be the line of conduct adopted, but simply means to convey that, according to his ideas, the course or acts suggested are the proper ones to be taken under the circumstances.

It will also be observed that in some chapters the ordinary style of this work has been departed from, and another more involving personal address substituted. The Author found that, in laying down directions for the performance of certain routine duties, it was more convenient and condensed to suppose himself speaking to those for whose benefit his book is intended, than to clothe these necessary directions in a style abstract and more diffuse. In fact, when duties such as the “handling” of gear came to be specified, it was found impracticable to convey directions in any other mood than the imperative.

CONTENTS.

DISPLACEMENT AND SHAPE.

Hydrostatics in connection with Naval Architecture. – Capacity of Ships. —

Shape. — Size. – Great Eastern. – Iron and Wooden Ships. - Fluid Resist-

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CONSTRUCTION.

Wet Docks. - Dry Docks. - Floating Dam. -Slips and patent Slips. -- Grav-
ing Dock. – Coffer Dam. - Timbers used in Ship-building. - Mechanical
Properties of Materials used in Construction. - Table of Strength of Mate-
rials. - Ditto of transverse Strength of Iron Bars. - Ditto of tensile
Strength of different Materials. - Ditto of Weights, Sizes, and specific
Gravities of substances used in Construction of Ships. – Bolts and Nails.
Mould Loft. Principal Timbers, &c., of Ship. - Coppering.– Rudders. -
Pumps. — Body Post and After Deadwood. - Measurement for Tonnage.-
Amount of Materials for 120-gun Ship

- - 22

Difficulties in launching. - Contrivances for floating grounded Ships. — Rules

for estimating bulk and Buoyant Capacities of Spars. - Table of Contents of

round Timber.- Rules for Measurement of open Vessels.- Rafts of Ships'

Materials.- Rafts of Trees. - Specific Gravity -

. 57

Use of Ballast. - Weight of Ballast in former and present Times. - Centre of
Gravity.- Connection of Centre of Gravity with Displacement. — Distribu-
tion of Weights. - Effect of Trim on Sailing. - Stability.- Connection of
Stability with Trim and Form. - The Water Level. – Dr. Arnott on Fluid
Resistance.- Ballast. – Tanks

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Gravitation. - Power as distinguished from Strength. - Unit of Work. - The
Motive Powers. - Lever. -Wheel and Axle. - Leverage.- Patent Capstan.
-Concentrated and diffused Powers. - Tackle - List of Tackles.- In-
clined Plane. - Wedge. - Screw.- Compound Wheel and Axle. - Friction.
-Friction in connection with Blocks

85

CHAP. X.

EQUIPMENT : RIGGING.

Manufacture of Ropes. – Hempen and coir Rope. — Table of Size of hemp,

chain, and wire Rope. – Ditto of Strength of chain, hemp, and wire
Rope. - Ditto of Threads, and Weight of bolt Rope. -Ditto of Number of
Threads, Weight, and Strength of hemp Cables. - Ditto of Threads, and
Weight of hawser-laid Rope, three Strands. - Ditto of Threads, and Weight
of hawser-laid Rope, four Strands. - Ditto of Weight of Tacks. — Blocks.-
Table of Sizes of rope Stropping. - Diito of Weights of wooden Blocks. -
Ditto of Size and Weights of purchase Blocks. - Metal Blocks. Standing
Rigging.- Running Rigging.- Cutting out.-Rigging Ship.-Lower Cross-
trees and Tops. — Placing Tops. - Bowsprit. - Setting up Bobstays. –
Turning in Lower Rigging. – Reeving Lanyards. – Setting up Rigging. —
- Rattling.– Top-masts. — Futtock Rigging. — Crosstrees — Rigging Top-

masts.-Top-tackle Gear, - Top-gallant Masts. - Top-gallant Rigging. -

Top-sail Masts.- Lower Slings. The Jib-boom

134

Porter's and Rodgers' Anchors.-- Jury Anchors. - Chain Cables. -- Anchor

Shackles. - Cable Swivels. - Cable Shackles. - Splicing Shackles. -
Hardy's Mooring Swivel. - Table of Number and Weight of Anchors,
and Number and Size of Cables and Messengers. - Table of Splicing
Shackles, Mooring Swivels, and Chains, as to Weight and Value.- Rules
for finding Weight of open linked Chains. – Ditto for finding Weight
that may be lifted by Chains. -Table of Strain, Size, Value, and Weight
of chain Cables and Anchors. -Dimensions of Lockers for chain Cable. -
Working, Placing, and Securing Cables and Anchors, Waist, Bower, and
Stream Anchors. - Buoys and Buoy Ropes

- 215

Gun Metal. - Parts of a Gun.- Parts of a Gun-carriage. - External and In-

ternal Appearance of Gun-carriage. - Parts of a Carronade. - Angle of
Dispart, Sights, and Tangent Scales. - Calibre.- Mortars.-- Proof Charges.
-Table of Proof Charges of different sized Ordnance. - Gunpowder.-Di-
mensions of Powder Packages. --- Shell. - Blue Lights.-- Long Lights.-

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