Hyundai Samho Heavy Industries is said to have inked an order for two 9,000-teu containerships from a Singapore-based shipowner.
A marine microbarograph is a precision barograph using greater magniﬁcation and an expanded chart. It is designed to maintain its precision through the conditions encountered aboard ship. Two sylphon cells are used, one mounted over the other in tandem. Minor ﬂuctuations due to shocks or vibrations are eliminated by damping. Since oil ﬁlled dashpots are used for this purpose, the instrument should never be inverted. The dashpots of the marine microbarograph should be kept ﬁlled with dashpot oil to within three-eighths inch of the top. The marine microbarograph is ﬁtted with a valve so it can be vented to the outside for more accurate pressure readings.
Ship motions are compensated by damping and spring loading which make it possible for the microbarograph to be tilted up to 22° without varying more than 0.3 hPa from the true reading. Microbarographs have been almost entirely replaced by standard barographs.
Both instruments require checking from time to time to insure correct indication of pressure. The position of the pen is adjusted by a small knob provided for this purpose. The adjustment should be made in stages, eliminating half the apparent error, tapping the case to insure linkage adjustment to the new setting, and then repeating the process.