What is the official designation of the building visible from the Morpeth Arms in a manner enabling spying?
SIS Building The SIS Building or MI6 Building at Vauxhall Cross houses the headquarters of the Secret Intelligence Service (SIS, MI6), the United Kingdom's foreign intelligence agency. It is located at 85 Albert Embankment in Vauxhall, a south western part of central London, on the bank of the River Thames beside Vauxhall Bridge. The building has been the headquarters of the SIS since 1994.
Measurement tower A measurement tower or met mast is a free standing tower or a removed mast, which carries measuring instruments with meteorological instruments such as thermometers and wind velocity measurers. Measuring towers are an essential component of rocket launching sites, since one must know exact wind conditions for an execution of a rocket start. Also in the proximity of some nuclear power stations (as in Grafenrheinfeld, Germany) there are measuring towers. Beside measurement towers, which are equipped with meteorological measuring instruments, there are also measuring towers for measuring the radiation pattern of antennas. Such towers are frequently implemented as metal-free timber constructions for the avoidance of disturbance of the radiation pattern, as the measuring towers of the antenna measuring position in bridge.