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System of Winding Two cages are wound by a direct coupled D.C. electric winding engine with a bi-cylindro-conical drum arranged for Ward Leonard control. The 2-deck cages land on baulks at the shaft bottom and on keps at the landing place in the headframe and they are decked simultaneously. Shaft Diameter — feet .., .., .., .., ... ... 18 Depth (to lowest entrance) — feet .., ... ... 1,285 Upcast or downcast .., .., .., ... ... Downcast Guides Type of guides .., .., .., .., ... ... Rope Number of guide ropes per cage .., ... ... 4 Disposition of ropes .., .., .., ... ... Near corners of cages Method of suspension and tension .., ... ... Clamps in headframe and tensioned by deadweights in sump. Diameters of guide ropes — inches .., ... ... 1¼, 1 3/8 and 1½ Weight suspended from each rope — tons ... ... Varies from 4.6 to 5.95 Headframe Construction .., .., .., .., ... ... Steel joist Number of pulleys .., .., .., ... ... 2 Diameter of pulleys — feet .., .., ... ... 16 Method of loading and unloading cages ... ... Pneumatic rams for each deck. Safety catches for cages .., .., .., ... ... 2 sets of multiple safety catches. Maximum overtravel distance before detaching hooks 21 feet 3 inches operate. Cages Number of decks per cage .., .., ... ... 2 Number of tubs per deck ... ... ., ... ... 2 Weight of cage — tons .., .., .., ... ... 5.78 Weight of suspension gear — tons... .., ... ... 1.15 Tare of 4 tubs — tons .., .., .., ... ... 1.65 Nett load of coal (4 tubs) — tons .., .., ... ... 3.79 Total load suspended from rope capping when winding coal — tons ... .., ... ... 12.37 Winding Ropes (a) Underlap Rope Type .., .., ... ... . ~. ... ... Locked coil Diameter — inches ... ... .., .., ... ... 1.55 Weight — lb./per foot .., .., .., ... ... 5.95 Actual breaking load (when new) — tons.., ... ... 133 .45 Winding Ropes — continued (b) Overlap Rope Type .., .., .., .., .., ... ... Locked coil Diameter — inches .., .., .., .., ... ... 1.50 Weight — lb./per foot .., .., .., ... ... 5.65 Actual breaking load (when new) — tons ... ... 123 Drum Type .., .., .., ... ... Bi-cylindro-conical Diameters — feet .., .., ... ... 11.0 to 17.5 Rope distribution — dead turns on small diameter ... 2¾ live turns on small diameter ... 3¼ turns on scroll .., ... ... 5 turns on large diameter ... ... 17¼ Mechanical Brakes Number of brake paths .., .., .., ... ... 2 Diameter of brake paths .., .., .., ... ... 12 feet 6 inches Width of brake paths .., .., .., ... ... 8 inches Type of brake .., .., .., .., ... ... Bottom anchored post Type of friction lining .., .., .., ... ... Ferodo CR. fabric Method of application .., .., .., ... ... Deadweights Method of control .., .., .., ... ... Compressed air brake engine. Type of control valves .., .., .., ... ... Iversen and air escape Other controls .., .., .., ... ... ... Cataract cylinder with provision for fast and slow braking. Electrical Braking System .., .., .., .., .., ... ... Regenerative Winding Duty Maximum number of winds per hour .., ... ... 75 Nett load of coal — tons .., .., .., ... ... 3.79 Maximum number of men per cage .., ... ... 44 Winding Cycle Duration of wind — seconds ... ... ... ... 40 Decking time — seconds .., .., .., ... ... 8 Total winding time — seconds .., .., ... ... 48 Speeds Nominal maximum winding speed — feet per second ... 49.2 Nominal maximum drum speed — r.p.m. ... ... 53.7 Winder Motor Method of coupling .., .., .., ... ... Direct Rated horsepower (nameplate details) .., ... ... 1,200/2,040 Rated speed — r.p.m. .., .., ... ... 53.7 D.C. voltage .., .., .., .., ... ... +-425 Current — amperes .., .., .., .., ... ... 2,260/4,000 Motor Generator Set Main Motor Type .., .., .., .., .., ... ... 3-phase, 50 cycles slip- ring induction. Rated horsepower .., .., .., ... ... 900/1,800 Voltage ... .., .., .., .., ... ... 3,300 D.C. Generator Rating — kilowatts .., .., .., ... ... 900/1,700 Voltage .., .., .., .., .., ... ... +-425 Speed — r.p.m. .., .., .., .., ... ... 1,000/820 Flywheel Weight — tons .., .., .., .., ... ... 114 Automatic Contrivance Type .., .., .., .., .., ... ... Type "C" Lilly Controller with Duplex Governors.