A Special Lighting Committee was created in December 1908 by the Greytown Borough Council to enquire as to the best system for lighting the town. In October 1909 the Mayor of Greytown, Mr D.P. Loasby, reported to the Town Council the merits of coal gas lighting and its use for lighting not only in streets, but houses, shops and businesses. After a favourable report was tabled, the ratepayers approved the raising of 6000 pounds to enable the Council to proceed with a coal gas lighting installation. However, it took all the persuasive powers of Mayor Loasby and Cr H. Trotman to convince the Government that the gas works were necessary in the Borough. In July 1910, the State Guaranteed Advances Board accepted the Borough’s application for the loan. A suitable site was purchased beside the Greytown Railway Station (where Gray Brothers is now situated in West Street and where the question mark for this cache appears on the map) for the gas works and manager’s residence.
The Borough was lit with 8 pedestal lamps in Main Street, 2 in Great Frederick Street (now Jellicoe Street), 2 in McMaster Street, 3 in West Street, 2 in Humphries Street and 1 in Wood Street.
The pedestal lamps on Main Street were situated in the centre of the road and when someone drove a motorcar into one at the Post Office corner (the corner of Main and Kurtawahiti Streets), the Mayor thought it would be reasonable to recover the entire costs from the owner of the car. The Wairarapa Automobile Association took up the question of shifting the lamps to the footpath, but the Mayor and Cr Shanley were adamant that the lamps were to stay in their original positions. Only months earlier (September 1909) Cr Brunton brought up the question of regulating the speed of motorcars travelling through the town and had suggested that 10 miles per hour (16 km per hour) be the maximum speed permitted and the by-laws were amended.
The gas works flourished during the next 20 or so years, giving the promised light and heat that was such luxury to the older generation. Gradually, then with growing momentum, electricity began to take over –firstly in general lighting and then with power and heating. In November 1941 the gas works closed and was sold for its firebricks and fittings to the highest bidder.
“The Years Between, Greytown Borough Centennial 1878-1978” by B.H. Bull
And what does all of this have to do with where the cache is hidden?
One longtime resident of Greytown has told me the cache is beside a gas vent, while another resident says it is a gas lamppost. Despite my research for this cache, I have not been able to confirm if this is a gas vent or gas lamppost, although in 1911 four lamps were erected along the street this cache is hidden in. Whichever one it is, it is the last one (as far as I am aware) in Greytown.
The cache is a 250ml Sistema container, big enough for small trackables and containing a log book. Please bring your own pen/pencil.
To find the cache ( S 41° 0A.BCD E 175° 2E.FG0 ) you need to solve this 'Killer Sudoku' puzzle.
Normal Sudoku rules apply, except the numbers in the squares coloured a particular colour add up to the figures in the corner (eg: the numbers in the 4 blue squares add up to 20). No number can be repeated within each shape formed by a particular colour.
Extra hint: These are the only digits when added together equal these numbers:
4 = 1 + 3, 23 = 6 + 8 + 9
Other numbers have a single set of of 2 or 3 or 4 digits, when added together, equal them -you can find them out. 
