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24. Explain how you would distinguish between a pure and an hydraulic lime-1st, as regards their action in slaking; 2nd, as regards their action in setting.

*25. A diagram of a trussed girder loaded at the point marked A.

(14.)

Draw to double the scale, showing all the members in tension by single lines, and those in compression by double lines. (14.) *26. A skeleton diagram of an iron roof truss. Show, by sketches, the section you would adopt for the members a, b, c, d, e.

Assuming the dimensions of the different members, give an elevation, rd full size, showing the details of the joint at the head of the truss. (14.) *27. Elevation of an internal doorway in a lath and plaster quartered partition.

Give a section through A, B, to a scale of 2" to a foot, showing a 2" door with moulded panels and architraves; the door stud to be 4" x 4", and the quarters 4" x 2", only one of which need be shown. (16.) *28. Elevation of a cast-iron beam of a uniform cross section, loaded at the centre. Taking its extreme breadth at 3ths the depth, and the thickness of metal as 1" throughout, first draw the cross section of the girder to a scale of 1" to a foot, supposing it to be supported at the ends, and afterwards draw a cross section, supposing the ends to be fixed. (16.) *29. A cross section of a room showing a doorway in a quartered partition.

Draw, to a scale of 4 feet to an inch, an elevation of the timber truss from the following dimensions-

Head and sill

Door studs

Quarterings

Braces

Show how it is supported.

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The details to be filled in on one half of the truss only; the rest

being shown by single lines.

(16.)

30. The centreing for a semicircular archway, of 12' span, is to be formed out of 1" deals.

Give an elevation of the same to a scale of, showing how it is supported by timber uprights. The centres to carry 4" x 2" laggings.

(16.)

31. Draw, to a scale of 5' to an inch, from the following details, an elevation of a roof truss for a 25′ span :

Tie beam

Principals
Struts
King rod

4" x 10"

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32. Give sections,full size, through-1st, a 2" roll joint in a lead gutter, the lead resting on 1" gutter boards, carried by 3′′ × 2′′ bearers; 2nd, a drip in the same gutter.

Honours Examination.

INSTRUCTIONS.

(18.)

Read the General Instructions at the head of the Elementary paper.

You are only permitted to attempt eight questions.

Of these, four must be selected from the first six questions, and four from the rest of the

paper.

SUBJECT IV. NAVAL ARCHITECTURE.

EXAMINERS, W. B. BASKCOMB, Esq., AND
J. H. MORRISON, Esq.

GENERAL INSTRUCTIONS.

If the rules are not attended to, the paper will be cancelled.

Sketches,

You may take the Elementary, or the Advanced, or the Honours paper, but you must confine yourself to one of them. required to be made to scale, must be inked in with drawing pen. Put the number of the question before your answer.

You are to confine your answers strictly to the questions proposed. Your name is not given to the Examiners, and you are forbidden to write to them about your answers.

The value attached to each question is shown in brackets after the question. But a fuli and correct answer to an easy question will in all cases secure a larger number of marks than an incomplete or inexact answer to a more difficult one.

The examination in this subject lasts for four hours.

First Stage or Elementary Examination.

INSTRUCTIONS.

You are only permitted to attempt ten questions.

You must attempt No. 21. Two of the remaining questions may be selected from the Calculations; and the rest from one, but not from both, of the sections of Practical Shipbuilding.

PRACTICAL SHIPBUILDING.-SECTION I.

Wood and Composite Ships.

1. Show by sketches how two pieces of keel are united, and explain where it is usual to place stopwaters. (8.) 2. How would you proceed to side a straight piece of timber, such as a piece of keelson? (8.) 3. What is the progressive mode of moulding a frame timber? State what is marked upon it from the mould, and how the bevellings are applied. (12.)

4. How would you take an account of a shutting-in plank, and how would you proceed to work it? (12.) 5. Name the different partners in a ship and the services they are intended to perform. Also explain what is meant by the term "housing" as applied to masts and bowsprit.

(8.)

6. To what smithery tests are the frame angle-irons subjected before using them, and why? (8.) 7. What is meant by the term intercostal keelson? Show by a sketch how it is connected to the floors and keel plate in a composite ship.

(12.) 8. Where the copper bolts pass through the wood keel and keel plate in a composite ship; what is done to prevent galvanic action being set up between the copper sheathing and the frame of the vessel? (8.) 9. What means are taken to prevent leakage between the two thicknesses of wood sheathing on the bottom of a composite ship? Describe some process of water testing the different compartments.

(8.) 10. Give a sketch in section showing how the bilge keel is fitted and fastened when two thicknesses of bottom planking are used in a composite ship. (10.)

PRACTICAL SHIPBUILDING.-SECTION II.

Iron Ships.

11. To what defects in manufacturing are iron plates liable? How are iron plates tested, and what strains are they expected to bear?

(12.) 12. What is the breadth of lap required by Lloyd's rules for single and double rivetting- respectively? Show how you would space the rivets in these laps. (8.) 13. What is meant by "tack" rivets? Where are they used? (8.) 14. How are the positions of the rivet holes transferred from the inside of a template to the inside of a plate of the bottom? (8.) 15. What rivet holes in the frame is it usual to leave unpunched until the ship is framed and the plate edges faired in? (4.) 16. What are the advantages and disadvantages of punching holes in iron plates as compared with drilling the holes? (10.)

17. What is meant by "lap joint" and "jump joint," and in what parts of a ship are these joints used? (8.) 18. Give sections of the different kinds of beams used in ships. (8.) 19. Show by a sketch in section the flat and vertical keel plates of a ship, with their connexions. (12.) 20. Show by a sketch the rivetting in the edges and butts of flat keel plates, giving diameter and pitches of rivets and sizes of plates.

DRAWING.

(12.)

21. Given a portion of the sections of a fore body plan of a vessel on a scale of inch to a foot, draw this to a scale of inch to a foot, and state what the lines crossing the sections represent, and explain their use. (14.)

CALCULATIONS.

22. Define the following terms-" area of section "centre of gravity"; and "displacement." The "half" ordinates of the midship section of a vessel are 12.8; 12.9; 13; 13; 13; 12.9; 12.6; 12; 105; 6; and 1.5 feet respectively; and the distance between each of them is 18 inches. Find the area of the section in square feet.

R 2264.

B

(8.)

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