Show EGG EG G CISTERNA CISTERN CISTERNs ra A correspondent eili eill thomas omas 11 johns of port nj miss mias informs us that egg shap shaped d watce water cisterns are becoming very general in the south alid arid west and that th they eyare are far superior to the flat bottomed cisterns common at the f following fallowing fal thi lowing is a description of the method of constructing th the e abo above e named cisterns ci sterne the ground is ecca excavated aled to toa a greater depth at the centre than at the sides and anti rounded i gradually towards the greatest width or circumference cu cum ference this forms the bed of an all dinyer inverted ted arch the bricks are laid in hydraulic cement by commencing at the c enter center 1 and v en the arch bottom is fort formed ned the he side walls and top to arch are constructed in ill the usual way waye our lun our oun co correspondent has had bad large cisterns of tw twenty ent feet diameter built in this manner and arid he assures 6 us they never fail when the war work k mar mai manship iship is properly executed flat bottomed i cisterns we know often leak but this ibis we have considered to be the fault of the workmanship workman vork manship ship the masons do not generally make the bottoms of cisterns sufficiently thick nor do they use isa ise a requisite amount of cement for tor the tile bed aa As the egg shaped cisterns have no edge or angle at the bottom of course the they are capable of withstanding a 0 greater reater amount of hador static pressure than the flat bottoms and are 1 the therefore lot sq liable to leak i elm jim 1 |