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|All Authors / Contributors:||
A P Ryder, Sir; Howard Douglas, Sir; Edward Belcher, Sir
|Description:||viii, 28,  p.,  leaves of plates ; 21 cm. (8 vo)|
|Contents:||Methods: 1. Sir Howard Douglas's method - 2. The horizon method, proposed by the author to meet cases to which Sir H. Douglas's method will not apply - 3. Sir Edward Belcher's method, applied horizontally - 4. Sir Edward Belcher's method, applied vertically - 5. The vertical method alluded to in the Blue Book issued by H.M.S. Excellent - 6. A method depending on the rate at which sound travels.|
|Responsibility:||by Captain A.P. Ryder, R.N., F.R.G.S.|