What sort of instruments did the Colonial ship-masters carry? What did they have on the _Mayflower_? What did Columbus use? And, to come down to comparatively recent times, what instruments were available and were actually used on the vessels during the commercial-marine activities following the American Revolution and up to the time of the appearance of steamships? These questions are often asked, not only by landsmen but by seafaring men as well. The ship-master of today uses instruments so different from those of Colonial times, or even of the earlier years of the nineteenth century, that unless he has a penchant for research he knows nothing about the earlier ones and certainly not how …
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