e unit locomotive

During the year 1930 there was clearly one engine which as on hype named as 'Ricardo' sleeve valve engine. Mirrlees that point introduced two Mirrleesengines represented this patent type of the valve engine. Well the first sort had bore of around 5.5 inches and designed a stroke of almost 6.5 inches and produced 20BHP each cylinder at rate of 900 r.p.m. another had 17 inches bore and 21.5 inches stroke, giving 50BHP per cylinder on the rate of 200 r.p.m. The name Opal comes from three sources. One is the Latin word "Opalus". The second one is from your Greek word "Opalliois" meaning a difference of colour lastly from your ancient Sanskrit word "Upala" meaning precious stone. If one speaks of gemstone over these tongues the saying Opal would be Opallious upala, which suggests precious stone.Which shows of assorted colours when shifted against light.