Thursday, 15 May 2008
Laser Installation 2
The above slide show details the installation of the infra-red laser at the Liverpool Catherdral.
The installation involved fixing the laser to a parapet on the bell tower of the Cathedral. The installation was made difficult due to access issues in the building, locating the laser at the best height, only being allowed to use non-intrusive fixing of the laser because of heritage considerations and the distance from the Cathredal's audio system to the parapet.
Access to the parapet has to be negotiated through 2 lifts, narrow spaces within the Cathedral, many stairs and finally using a ladder from the bell-ringing area to the a window onto the parapet.
We explored several possible locations for the postioning of the laser but the parapet had the best height to link to the Metropolitan Cathedral especially when we install the green visual laser.
We eventually overcame the fixing of the laser to the parapet by using a resin, which enables us to get the strength of fix to maintain the link in all weathers and get over the problem of not being able to bolt the laser to the floor.
We were presented with a problem of fixing the internal cabling once we decided on the positioning of the laser. This problem was solved with considerable help from the Cathedral's staff who fixed the cable for us so that it was not intrusive.