Heating may be effected by one of the following systems, or installations may be so arranged as to combine the advantages of more than one method: open fires, closed stoves, hot-air apparatus, hot water circulating in pipes at low or at high pressure, or steam at high or low pressure.
Two classes of boilers are chiefly used in hot-water heating installations, viz.
Much attention has been paid to the improvement of the mechanical details of the lifting and other motions of cranes, and in important installations the gearing is now usually made of cast steel.
The installations of the knights of St Patrick, the first of which took place in 1783, were originally held here, and some of their insignia are preserved in the choir.
The only modern works were a certain number of safety-armament batteries distributed in the intervals, of installations for 5.7 mm.