| Show wireless mast on chinas cainas wall A reinforced concrete wireless mast of large dimensions lias has been erected upon the chinese wall niall for tile use of the american navy it Is feet in height the original program called tor for the making of the mast by the method in two parts and then erecting them th em by means of 0 derricks but an accident occurred while the erection was taking laking place and an american engineer and four coolies were killed the method of forming in molds was nas then tiled and although it was much more expensive than the other it was successfully carried out |