Merchant Ships Identification BR 115 Intelligence Division Naval Staff

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There is an empty pocket in the back and the last page is 78.

Soft Cover

78 pages

CONTENTS

Introduction

Classification of Merchant Ships

Recognition in Practice

Table I Size of Merchant Ship Types

Short Notes on Types

A Passenger Liner, including Cross-Channel ships

B Cargo Liners

C Tramps

D Tankers

F Coasters

G Trawlers and Drifters

Classification Societies

Identification by Structure

A Full Superstructure

B C & D Flush Decker and Three Island

E Engines Aft

How to Recognise

Types by Structure

Special Features

Bows and Sterns

Deck Erections in Cargo Liners

The Two Main Cargo Ship Super Structures

Midship Superstructures

Evolution of the Modern Super Structure

Smoke

Speed

The Size of Ships

Relationship between length and tonnage

Measurement of Merchant Ships

Miscellaneous Notes

Identification by Profile

Identification by Photograph

INTRODUCTION.

THE essence of accurate merchant ship identification, especially from the air, is to note the characteristics of the hull and the length. From these, when speed has been estimated, the ship's history' can be built up by experts. Closely allied to it is recognition from sea level, and it is for this purpose that the profile (more detailed than the silhouette) is employed.

This book is based (a) on photographs taken from Coastal Command aircraft, and chosen to assist pilots in recognising types of shipping and to give guidance where possible which will enable the size and duties to be estimated ; and (6) on profiles which have been prepared to show the potentially dangerous ships of Germany, Italy, France and Japan.

If tonnage is used as a measure of identification, then the kind of tonnage used must be specified, i.e. Gross, Deadweight or Displacement. Bear in mind that there is no regular relationship between gross and deadweight, or between gross tonnage and length. This is examined later in the book.

Identification of M.V's. falls under two distinct headings, under which all ship types may be considered :

A by duty ;

B by structure.

In the following pages these two ' headings ' are dealt with. Notes on each type by duty are illustrated and these are followed by illustrated notes on structure. It is then possible to show by profile the ships mentioned above and then to give aerial views. Profiles and aerial views are to scales

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