The British palladium; or, Annual miscellany of literature and science, for the year 1769. [electronic resource] : The first part consisting of new and select subjects. The second part containing answers to the former year's enquiries; and new enquiries proposed for the present year. For the use of gentlemen and ladies, youth at school, and navigators. Serving for land and sea. Being the twenty-first number published. By the author of The improv'd and perpetual royal astronomer and navigator.