The British palladium [electronic resource] : or, annual miscellany of literature and science: for the year 1771. The first part consisting of new and select subjects, of general utility. The second part containing answers to the former year's useful enquiries; with new and curious enquiries proposed for the present year. For the use of gentlemen and ladies, youth at school, and navigators. Serving both for land and sea. The twenty-third number published. Which may be had, The seaman's guide to the longitude, or key to the nautical ephemeris, just published. By the author of the improved Royal astronomer and navigator.