2007-01-032022-02-032007-01-032022-02-03https://hdl.handle.net/11124/9830B-134/1032; Figure 5 drill carriage jumbo and drilling detail.Date scanned: 2002-07-12.Held in the Russell L. and Lyn Wood Mining History Archive, Arthur Lakes Library, Colorado School of Mines.Donor: United States Bureau of Mines.A jumbo is a mobile drill carriage or scaffold on which several drills could be mounted. This illustration may depict construction details of part of the tunnel system for New York City's water supply from the Catskill watershed. In 1905 the New York State legislature passed an act allowing the City to acquire lands and build water control structures in the Catskills for its water supply, including the East Delaware Tunnel, West Delaware Tunnel and the Rondout Tunnel (Delaware Aqueduct).Rights management statement available at: http://library.mines.edu/digital/rights.htmlWater supplyTunnels and tunnelingStillImage