Supplement to the Practical rules for ascertaining the deviations of the compass which are caused by the ship's iron, being Instructions for the computation of a table of the deviations of a ship's compass, from observations made on 4, 8, 16, or 32 points 

 - (2d ed.) 
 - London,  Printed for the Hydrographic office, Admiralty,  1855. 
 - 39, [1] p.  tables. fold. diagr.  25 cm. 
<br/><br/><label>LCCN: </label>09012446  
<br/><br/><label>Subjects--Topical Terms: </label><br/>Compass.<br/>Magnetism of ships.
<br/><br/><label>LC Class. No.: </label>HF5721  / .L56 1855