HALIFAX WATER WORKS. JOHNSTON. 101 



g-lazing mentioned will be necessarv ; Init if the glazing is con- 

 sidered an advantage that all the small pipes ordei'fed he glazed. 



Fortunately, before this letter was received, the order had 

 been placed and the pipes came out coated. These pipes were 

 laid with wood joints. The cost was £5 1-is. lOd. per ton, 

 exclusive of freight. 



In 1862 the commissioners of water-supply took up the 

 original 12-inch main and substituted therefor a 24-inch main. 

 These pipes were ordered from Glasgow. The quantity required 

 for the Xorth West Arm valley to l>e 1 iueh thick, tested to 200 

 pounds; and the remainder to be f inches, tested to 150 pounds. 

 All pipes to be 9 feet long and coated with Smith's patent 

 coating. They were laid with wooden joints and cost £4 4s. 3d. 

 ])er ton, exclusive of freight or duty, or £6 18s., exclusive of 

 truckage. The total cost of laying this main was $54,004.39, 

 or an average cost of $4.00 ])er lineal foot. The estiuiated 

 capacity was 5^ million gallons when new. There is a 12-inch 

 exit pipe at the Dutch Village Road. On the introduction of 

 the 'Miigh service" in 1808, the 15-incli main laid in 1850 was 

 used as a part of the sup])ly main and was extended to within 

 1:^ miles of Spruce Hill Lakes, this latter distance being laid 

 ^\^th 20-inch pipe. These are f inch thick and the 15-inch are 

 f' inch. They are feet long and coated Avith Smith's jiatent 

 varnish and are laid with wooden joints. That portion of the 

 old 15-inch lying in the valley of the Arm was uncovered 

 and lead joints substituted for the wood. On the 14th January, 

 18G0, the commiussion had a rejwrt from their superintendent, 

 Cduiplainiiig that the 15-inch pipes laid the previous year Avere 

 giving considerable tr(^uble from tlie fact of the un(M|ual casting, 

 a munber of pipes breaking under a pressure of 08 ])()un(ls. On 

 examination tliese pipes Avere found to be only ^ incli thick on 

 one side and full j^ inch on the other, and during the winter the 

 pressure was regulated so as not to exceed 45 [xtunds at Chain 

 Lakes pipc^ house. The pipes s])lit along the thin side. The 



