Antique Transparent Course Protractor T.S. & J. D. Negus Nautical Instruments

Description

ANTIQUE
TRANSPARENT COURSE PROTRACTOR T.S. & J. D. NEGUS NY NAUTICAL INSTRUMENTS
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NO RESERVE:
DESCRIPTION:
Antique 19th Century Transparent Course Protractor T.S. & J. D. Negus Nautical Instruments.
Protractor measures approximately 4 1/4" square. Sleeve measures 4 1/2" square.
Manufactured by T.S. & J.D. Negus of New York, NY in the 1890s.
Made of celluloid or isinglass, with a compass printed on it and a length of string coming from the center of the card to be used as the protractor's arm.
Printed on the front of the paper sleeve in which it is held:
"TRANSPARENT COURSE PROTRACTOR, BY T.S. & J.D. NEGUS, Nautical Instruments, 140 WATER STREET, NEW YORK. IT IS USED 1st. Instead of Parallel Rulers, to find on Charts courses and bearings, and positions from cross bearings. 2nd. As an Inspection Table, to turn Compass courses into true courses and "vice versa." DIRECTIONS SEE OTHER SIDE. Price .50".
Printed on back of sleeve:
"DIRECTIONS.
Place the open centre of the Protractor directly over the position of Ship on the chart, then set the Protractor true by the parallel lines around its edges, cutting or running parallel to some meridian on the chart. With the silk cord draw a North line; then keeping the cord drawn to the North, with the other hand turn the Protractor, (keeping it central over position,) to the East or West for variation and deviation, if any. Now, stretch the cord to any point, and the reading on the Protractor where the cord passes over it will be the Compass course to be steered."
Cool antique piece of nautical history.
Perfect to add to your collection.
CONDITION:
In used condition.
String is attached. No rips, tears or repairs to the protractor.
Sleeve is torn & stained. See photos.
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