MENSURATION FOR The Use of Schools. WITH NUMEROUS EXAMPLES. BY SEPTIMUS TEBAY, B.A., ST JOHN'S COLLEGE, CAMBRIDGE, head master OF QUEEN ELIZABETH'S London and Cambridge: 1868. [All Rights reserved.] PREFACE. THE object of the present work is to enable boys to acquire a moderate knowledge of Mensuration in a reasonable time. All difficult and useless matter has been avoided. The examples for the most part are easy, and the rules are concise; those depending on the circle are only first approximations; but the rules are handy, and the results are always sufficiently accurate in practice. A description of the Plotting Scale is given with a view to make this useful instrument more familiarly known to boys, who meet with it in cases of instruments; but rarely know the use of it. Some prominence is given to the method of finding the content of an irregular area by seven equi |