OF the numerous by-products of tar, only a few can be worked locally on a remunerative basis, viz:—naphtha, light creosote, anthracene and pitch.
he ammoniacal liquor recovered from the washers and scrubbera is pumped through a still, the ammonia being exied and passing through sulphuric seid precipitates the salt ammonium sulphate which commands a good price locally, The water supply for the Gas Works is drawn from the Soochow Creek by pulsometers, passes through sand filter beds and is then pumped into overhead tanks.
The laboratory is well equipped with all the necessary apparati for the numerous tests required on a gas works analysis of gases, coals, tar, oxide, ete. also recording calorimeters and photometer.
The we clude meter proving room, smithy, carpenters', fitters', eleetricians', painters" and tin shops, also £as engines, meters and cookers repair shops; but owing to the large increase in the amount of work that is undertaken it will soon be necessary to build larger work shops.
After the gas leaves the holders it Passes through the district governors which automatically control the pressure.
The distribution of gas in Shanghai is a very difficult problem owing to the rapid extension of the districts, and the congestion of pipes, cables, ete, in the roads. Eventually it will be necessary to feed the extreme ends of all districts with gas at high pressure pumped from the Works through steel mains,
Text read from the printed page and cleaned; old type leaves the occasional error.