VOL. XXXVII.] PHILOSOPHICAL TRANSACTIONS. 557 



The historical part, is an account of several naval expeditions and battles, 

 between the Turks and Christians, especially during the holy war, in the Me- 

 diterranean sea, with their conquest of the islands and places of note on the 

 sea-coasts. It is an abridgment of the history of their admirals, from the 

 taking of Constantinople-, to the year 1 653; gives a description of the Grand 

 Signior's Arsenal at the Porte, with the charges of maintaining it; and con- 

 cludes with some directions to the Turkish officers. 



Besides a general map of the world, there are three others; one of the 

 Mediterranean, or White Sea, as the Turks call it; another of the Archipelago, 

 and the third of the Venetian Gulph: they have each scales of Turkish, French 

 and Italian miles annexed; but, what is rather surprising, these maps have the 

 degrees of latitude, but not of longitude, marked on the sides. 



The last plate has two mariner's compasses, the one containing the Turkish 

 names of the several points ; the other, besides the Turkish, has the Arabic 

 names, which are taken from certain stars supposed to rise and set on or near 

 those points. 



The book ends with words to this sense: this Treatise was done by the per- 

 sons employed in the business of printing, at the printing-house erected in the 

 noble month of Dulkaadah, in the year 1141, (i. e. 1728) in the good city of 

 Constantinople. May God, Sec. 



It has prefixed the Imprimatur, or Commendations of a Turkish divine, and 

 three Eftendis ; and at the end, an Index of the Errata, with their Emenda- 

 tions in three pages. The whole is done on shining or gummed paper, stamped 

 with three crescents in pale, and an Imperial crown, proper to the Turks. 



Observations made on Board the Chat ham' Yacht, Aug. 30 and 31, and Sept. 1, 

 1732, in pursuance of an Order of the Lords of the Admiralty, for the Trial 

 of an Instrument for taking Angles, described in the Philos. Trans. N° 420. 

 Bij John Hadleij, Esq. V. P. R. S. N° 425, p. 341. 



In N° 420, Mr. Hadley communicated to the Royal Society the description 

 of a new instrument for taking angles, and produced a specimen of an instru- 

 ment made accordingly. Several of the gentlemen to whom it was shown, 

 as well then as at other times, entertained a favourable opinion of the proba- 

 bility of its usefulness, particularly Dr. Halley and Mr. Bradley, not only ex- 

 pressed their desire that trial should be made of it at sea, but promised the 

 favour of their company and assistance on that occasion. 



The instrument produced at the Society was made of wood, and was intended 

 chiefly for taking altitudes of the sun, moon and stars, from the visible hori- 

 zon, either forwards or backwards. Mr. Hadley therefore procured another to 



