PORTER'S KEY

TO THE

CELESTIAL GLOBE,

AND

TABLE

OF THE

MAGNETIC NEEDLE'S VARIATION,

AT THE PRINCIPAL

ISLANDS, CITIES, AND TOWNS,

IN ALL PARTS OF

THE WORLD.

LONDON:

MDCCCXLIII.

[Entered at Stationers' Hall.]

LONDON:

Printed by James and Luke J. Hansard, near Lincoln's-inn Fields.

KEY

TO THE

CELESTIAL GLOBE,

OPENING A DIRECT REFERENCE TO EVERY

CONSTELLATION,

THROUGH THE RIGHT ASCENSION AND DECLINATION

OF THEIR

Principal Stars,

GIVEN IN TABLES, WHICH, TOGETHER WITH
THE SUN'S PLACE,

AND OBSERVATIONS ON THE

MOON AND PLANETS,

FORM AN EASY INTRODUCTION TO

ASTRONOMY.

TO WHICH IS ADDED,

The Variation of the Magnetic Needle

AT THE PRINCIPAL ISLANDS, CITIES, AND TOWNS,

IN

ALL PARTS OF THE WORLD;

A KNOWLEDGE OF WHICH, IN PLACING THE GLOBE FOR USE, IS NECESSARY
TO OBTAIN

A TRUE MERIDIAN.

BY SAMUEL PORTER

London:

PUBLISHED BY FRANCIS WEST, 83, FLEET-STREET, & 41, STRAND,
NEAR CHARING-CROSS ;

AND SOLD BY ALL OPTICIANS AND BOOKSELLERS.

MDCCCXLIII.

[Price One Shilling and Sixpence.]

PREFACE.

THIS Book will save a great deal of time and trouble to those who give instruction, and render the task pleasant to those who receive it: even Children may, in less time than they can put a dissected Map together, which they never saw before, learn to amuse and instruct each other; and they will be delighted to carry their observations from the Globe to the Heavens, when the Stars appear.

The Map soon becomes insipid, but the Celestial Globe affords never-ending entertainment, from Childhood to hoary Age.