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3. Show by sketches the kind of dam you would erect to resist a pressure of 60 lb. per square inch stating kind of material used and reason for preference. 4 ' 1161106 th<3 UBe ° f Safety eXploBive8 ' and describe full y the dan ge r s from blown5. If you decide to treble the air passing through an aircourse, how much would the friction be increased * 6. Show by sketches how you would proceed to carry on drives towards old workings where you expected noxio^lse" 11 PleSSUre ' giving all P recautions deemed requisite, including provision against Subject 4-.-Elementary Electricity, Arithmetic, and Knowledge, of Coal-mines Act, also First Aid to the Injured. 1 ' " re Z!l 6 / t0 tr r mit P ° We , r t0 * long di f tan ° e ™ der B TOUnd f <« haulage purposes, what precautions would you observe m reference to voltage and protection of cables ? 2. What power of motor would you install to haul 10 trucks of coal up an incline grade 1 in 5 against load trucks and coal being 10 tons, speed 400 ft. per minute ? Give size of rope, and allow tor tnction and other losses. 3. If you have 100 pairs of miners producing 800 tons per day at a cost of 6s. per ton, and it is required to increase the output by 40 per cent, and to reduce the cost per ton 10 per cent., what additional men would require to be employed, and what would the average cost per ton be « 4. Having to construct a circular cistern to contain 3,000 gallons, a diameter of 8 ft. having been decided on, what would the depth be ? s First Aid. 1. Are you the holder of a certificate from St. John's Ambulance Society « 2. Enumerate the most essential kind of material and appliances which should be kept at all collieries tor the rendering of first aid. 3. State how you would render first aid to persons suffering from (a) burns, (6) broken lower limb, limb * bandages should he applied to stop profuse bleeding from injured Knowledge of Coal-mines Act. 1. State your knowledge of the Coal-mines Act with reference to (a) duties of underviewer ; (6) fireman examining mine before men enter upon their shift; (c) necessary reports and records to be kept m compliance with the Act; (d) the special rules for guarding against accident from fire-damp, and (c) trom blasting and coal-dust. F