REVOLVING TURRETS. 



reliance must be upon earthwork. and iron. The plan for revolving turrets for vessels pro- 

 Earthworks being liable to be captured by es- posed by Mr. Timby is essentially the same as 

 calade, must be defended by a force nearly as for those built upon land, modified only by the 

 great as the attacking one ; and iron, it is be- fact that there is a limit to the size and weight 

 lieved, can in no way be as advantageously of a turret which can he borne by a vessel. 

 used as in the system of turrets and its ad- The essential features of the automatic sighting 

 Junes. 





and discharge are equally applicable to both. 



ill 



