6. Outline a reliable method for estimating copper by means of a standard solution of potassium cyanide, including the preliminary separation of the copper from any ore impurities that would otherwise injuriously affect the titration.

What effect would salts of iron, lead, zinc, manganese, and aluminium have if present during the titration?

7. Describe a rapid method which is sometimes used (for furnace control purposes) for estimatingvery approximately-the amount of sulphur present in roasted ore or matte.

METALLURGY.-PART I.

SECOND PAPER.

The Board of Examiners.

Candidates should answer SIX of the following ques

tions.

Chemical Equations must be given wherever possible.

1. What 66 are refractory materials "? How are they classified, and for what metallurgical purposes are they used?

66

2. Explain the terms "intermittent" and continuous as applied to (a) hand-worked reverberatory furnaces; and (b) mechanically-worked reverberatory furnaces.

Give an example of each type, and compare their relative merits and demerits.

3. Write a short paper upon modern developments in copper smelting in reverberatory furnaces.

4. What are the reactions mainly concerned in the "Roast and Reaction" method for treating lead

ores, and for what class or classes of ore is the method most suitable?

5. Define the terms "slag" and "matte." How are slags classified?

6. Outline a method suitable for the extraction of zinc from its sulphide ore on a large scale. Explain the principal reactions concerned, and point out in what particulars (if at all) the method you give differs from one suitable for the treatment of zinc carbonate ores.

7. Explain, very briefly, the reactions upon which the various "hyposulphite" methods, for treating silver ores on a large scale, are dependent. For what class or classes of ore are such methods most suitable?

GEOLOGY.-PART I.

The Board of Examiners.

1. Give a short account of the nature, organic and mineralogical composition of coral atolls, and an outline of the important theories as to their mode of origin.

2. Define the following crystallographic terms:Form, truncation, law of rational indices, hemihedral, hemimorphic, and state the crystal forms (giving Miller's symbols) present in crystals of garnet, albite, beryl, rutile.

3. Give the chief subdivisions of Dana's classification of the silicates, and quote examples of minerals belonging to each of the subdivisions.

4. Give an account of the geology of the Dandenong area, and especially of the relations of the dacites to the plutonic rocks to the south.

5. Discuss the relative value of different fossil groups to the stratigraphical geologist. What do you understand by "zones," and give examples among Palaeozoic and Mesozoic rocks?

6. Discuss the chemical and mineralogical peculiarities of the intrusive rocks rich in alkalies.

7. Draw sections illustrating the following:--Crust block, trough fault, thrust fault, recumbent anticline, and state the effects produced on the outcrops of beds by dip, strike and reversed faults, respectively.

8. Compare the Permo-carboniferous formations of Victoria and New South Wales. Give a concise account of the lithological character of the Glacial deposits of Victoria and their probable mode of origin.

APPLIED MECHANICS.

FIRST PAPER.

Professor Kernot.

1. Prove that any tangential stress in ordinary materials is accompanied by an equal stress in a plane at right angles to the first. What bearing has this on the arrangement of rivets in plate girders?

2. Describe, fully, the process of testing a specimen of structural steel, giving the results you would expect including the autographic diagram. How do you account for the oblique or cup-shaped

fracture so often seen?

3. Assuming the specimen tested to be 8 inches long between gauge-points, and 1 square inch sectional area, compute the probable resilience and the average work done per cubic inch of specimen, before fracture, in foot pounds.

4. A circular obelisk of concrete is 50 feet high, 5 feet diameter at the base, and 3 feet at the top. It is composed of concrete, weighing 150 lbs. per cubic foot. What is its greatest safe resistance to wind-pressure, and what will be the safe resistance of a similar obelisk of double the linear dimensions, but supported on a foundation only 5 feet diameter.

APPLIED MECHANICS.

SECOND PAPER.

Professor Kernot.

1. A beam is 30 feet long, and is supported at points 6 and 25 feet from one end. For the first 6 feet it is loaded with a uniform load of 1 ton per foot. In the next 6 feet the load gradually increases from 1 ton per foot to 2 tons per foot, and then ceases. At 18 feet a concentrated load of 10 tons is imposed, while at the far end there is an upward force of 1 ton. Draw to scale moment and shear diagrams, and state what size beam you would use, the material being good ironbark. 2. Investigate the modulus of section as a beam of a

circular tube 20 inches internal diameter inch thick for a quadrant at each side, and I inch thick for a quadrant top and bottom.

3. A suspension bridge consists of a parabolic cable, numerous vertical suspenders, and a stiffening girder hinged at ends and centre. Investigate the moments and shears on the girder while a concentrated load traverses the whole span of the bridge.

4. Discuss the behaviour of an unhinged circular arch as at Prince's Bridge under varying temperatures, partial loading, and slight yielding of abutments.