The paper to be given this evening will describe the methods used and the sequence of operations in erecting a machine which has been delivered new or overhauled from the makers, as distinct from carrying out repair work.

It is proposed to commence with the methods used for checking the correct assembly of components and the rigging of an erected machine. We will assume that a machine has been delivered to the owner in a dismantled condition; that is to say, the wings, tail units, undercarriage and centre section have all been received separately, and it is necessary to entirely re-assemble the machine. It is assumed that the machine is in good condition and that each component has been approved already.