Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum
Telegraph block instument, lock & block type, W R Sykes & Co
Science Museum Group
© The Board of Trustees of the Science Museum