The number of houses in the sewerage area is 5,000.

The rate of filtration through a vertical slab of coarse sand, when the head of water on one side is H, and on the other is h, is given by the formula

where

Q

L

(=μ Χ

} (H + h) (H− h)

L

discharge in cubic feet per second per foot in length of slab.

thickness of slab in feet.

μ = '0004.

Show what provision you would make for removing the sludge and for keeping the sand clean.

MINING.

FIRST PAPER.

Mr. A. H. Merrin, M.C.E.

1. Explain the nature of a Fault. Distinguish between Dip and Strike faults. Define and illustrate the terms Heave, Throw, and Hade.

2. In driving along the course of a lode, a cross-course is met with, having an apparent hade of 30°. The angle between the strike of lode and of cross-course is 50°. Determine the true hade of

cross-course.

3. State the theories of lateral Secretion and Ascension

in connection with the formation of metalliferous veins, and show how modern views tend towards a reconciliation of differences.

4. Describe the structure of metalliferous veins and the arrangement of ore therein.

5. Show by actual examples the nature of the lode matter met with above and below water-level in a Copper and Silver lode respectively.

6. Explain and illustrate the connection between the metalliferous contents of detrital deposits and the metalliferous zones in the country adjoining.

7. Discuss the theories that have been advanced to account for the existence of Nuggets in auriferous drifts.

8. Give a brief account of the occurrence and characteristics of the Banket Beds of the Rand.

9. A quartz lode outcropping has an underlay of E. 20° S. 60°, and carries a shoot of ore 200 feet long, with a northerly pitch of 45°. The eastern boundary of the property is parallel to the strike of lode and 300 feet distant from outcrop. Average width of lode, 3 feet.

(a) Fix the position of shaft and levels, and prepare the underground plans to a scale of 40 feet to the inch.

(b) Calculate the quantity of ore in property.

MINING.

SECOND PAPER.

Mr. A. H. Merrin, M.C.E.

1. Write brief notes on prospecting for gold in unexplored country.

2. State the advantages and disadvantages of underlay shafts in lode mining.

3. Describe the various systems of working coal seams, and illustrate one of them, giving the conditions favourable to its adoption.

4. State the causes of the pollution of air in mines. What influences affect the natural air currents?

A downcast shaft is 600 feet deep, temperature 50 F.; upcast shaft 900 feet deep, temperature 100° F.; bar 30 inches. Determine the water gauge.

5. Show in detail how you would timber a rectangular shaft for an alluvial mine 250 feet deep, the size of the shaft being 11 ft. 6 in. x 4 ft. 6 in. in the clear, with three compartments. Make provision for all requirements.

6. Sketch out a design, giving leading dimensions of the winding machinery required for a deep lode mine.

7. Trace the method of dealing with auriferous alluvial from the start of panelling operations to the securing of the gold.

8. Make a sketch of a set of 10-in. plunger workings, giving leading dimensions, and show its connection with the pump rods. Determine the discharge capacity in gallons, and the engine horse-power required with a head of 1,000 feet.

9. Make a cross-section of a stamper-box, and show in detail the parts of a complete stamper.

State the advantages of using automatic ore feeders.

10. Explain the principles of concentration embodied in the hydraulic classifier and in the travelling belt machine.

METALLURGY.

The Board of Examiners.

1. Define the calorific power and evaporative power of a fuel, and state how the former can be determined.

2. Discuss the question of the suitability of different materials for fire-brick or furnace-lining purposes.

3. What are the chief ores of bismuth? How is the metal extracted?

4. Give an account of the composition, physical properties, and occurrence of the more important ores of copper.

5. Give a brief account of the chlorination process for gold extraction, and discuss the various points in favour of the different precipitating agents now used on the large scale.

6. Sketch and describe a reverberatory furnace, such as may be used for smelting purposes.

7. Describe the Bessemer process as applied to iron.

ARCHITECTURE.-PRACTICAL.

FIRST PAPER.

The Board of Examiners.

1. Sketch on the plan of the warehouse marked A the spacing and arrangement of columns and girders you would adopt for supporting the floors, and calculate the sizes of footings for columns and walls, assuming the bottom to be very hard clay, and the following weights of walls, floors, and roofs:-Walls, 1 cwt. per foot super. for each brick in thickness; roofs, cwt. per foot super. measured horizontally; each floor 6 cwt. per foot super. gross (including loading and floors, and columns and girders). Girders to be assumed as discontinuous, and the roofs supported on walls only.

2. Assuming Melbourne materials, describe or specify what you would use for the footings, column stones, and basement walls and floors of warehouse A, assuming the site to be a damp one and the basement adjoining others.