356 CDALFII'XDS AND COLLIERIES OF AUSTRALIA. 



This is a naked light mine. The 30ft. diameter Waddle 

 fan is direct driven by a Morison and Bearbj' engine made in 

 duplicate. The fan has bearings in the air drift, as well as in 

 the engine room~ 



A Mather and Platt centrifugal pump raises 50,000 gallons 

 of water per hour against a head of 120ft. There are also five 

 electrically driven three-throw vertical Allantown. pumps. One 

 is driven direct by a Verety standard motor of 5 la.. p. The 

 others are belt driven from Westinghouse motors. 



An engine plane is worked down the main dip tunnel as far 

 as the air shaft, and also serves a crosscut. The main hauling 

 engine, built by Morison and Bearby, is geared; the drum be- 

 ing wide, has to have guide sheaves between it and the pit 

 top, on account of the fleet angle. Another engine plane con- 

 tinues down the main dip tunnel, worked by a rope passing 

 down the air shaft. The engine used is a small Morison and 

 Bearby, with two drums, so that it can be used for a main 

 and tail rope system if necessary, but just now only one drum 

 is used. The gearing is in front of the engine; some people 

 prefer this to having the gearing at the back, as any pull on 

 the drum has a tendency to make the cogs of adjoining wheels 

 mesh tighter together instead of pulling apart, when in the 

 latter case control of the drum might be lost. On the other 

 hand, front gearing sometimes gets in the way of the lower 

 rope. 



About 22 skips are brought out in a set. The last skip has 

 a "bull," or dragbar, so as to prevent the skips from running- 

 down hill in case the rope should part. 



There is a throw-off at the top end of the flat between the 

 two engine planes, also at the bottom of the lower engine 

 plane. This consists of about 10ft. of 601b. iron rail with its 

 down hill end hinged to a plug let into the roof. The loose 

 end is held up by a catch attached to a chain and rope that 

 pass round sheaves. The boy at the flat can tell by the sound 

 if the skips are running away, in which case he puts the throw- 

 off into action by pulling the line when the loose end of the 

 rail falls down, and the skips rush up against it. The first two- 

 skips are generally smashed up, but the rest are saved. 



At the pit top there are two shaking screens, three sta- 

 tionary screens, and two picking belts. The slack box with 

 the hopper truck, which is drawn up the incline by a rope 

 from an engine, can be seen in Fig. 224. 



The boiler plant at the main entrance consists of three 

 Cornish and one Lancashire boiler ; while at the air shaft there 

 are two Cornish boilers. 



In the powerhouse, there are two Jeffrey compound wound 

 G pole generators, one of 100k. w., the other of 80k. w., worked 



