624 
f 
STAFF COMMANDER E. W. CREAK ON THE DEVIATIONS OF THE 
In order to show the relative proportions of hard to soft 
iron affecting the standard 
compasses of the ships named in the tables — 
which are cruisers liable to be sent on 
long voyages — the values of \/P 2 +Q 2 and y/ c 2 - f- f 2 have been placed together here — 
VP-’ + Q" v 7 <9 + p 
Iron armour-plated ships— 
Bellerophon. 
•216 
•005 
Iron Duke. 
•416 
•060 
Triumph. 
•039 
■106 
Swiftsure. 
•058 
•110 
Northampton. 
•345 
•021 
Nelson. 
•287 
•024 
Iron vessels cased with wood— 
Active. 
•541 
•016 
Shah. 
•173 
•005 
Raleigh. 
•282 
•006 
Inconstant ...... 
•238 
•039 
Iron troop-ships— 
Euphrates. 
•359 
•027 
Himalaya. 
•281 
•009 
Orontes. 
Steel and iron ships cased with wood- 
•219 
•029 
Comus. 
•238 
•034 
Carysfort. 
•263 
•044 
Cleopatra . 
•076 
•032 
Composite vessels— 
Ruby. 
•500 
•027 
Gannet. 
•185 
•024 
Albatross . 
•232 
•029 
Boxer. 
•196 
•023 
Pert.. 
•244 
•026 
Firefly. 
•332 
•005 
Wrangler .. 
•375 
•002 
Wooden ships with iron beams, &c.— 
Encounter ...... 
•234 
•018 
Sapphire ...... 
•233 
•045 
On looking through the above values of v/h^+Q 3 , it 
differences occur in ships of similar construction. 
will be noticed that large 
It will be remembered that all iron and 
composite 
vessels are large magnets, 
