Design as many of the details of the boiler as you can, but amongst the drawings you must include one showing, to a large scale, the circumferential and longitudinal seams of the boiler fully dimensioned, and one showing the staying of the furnace crown.

The material of the boiler barrel is to be mild steel with an ultimate tenacity of 30 tons per square inch and 20 per cent. elongation on 10 inches, and the rivets are to be of steel whose ultimate shearing strength is 24 tons per square inch.

2. Design the coupling rod of a six-coupled locomotive from the following data:-

Distance from centre of leading axle to centre of driving axle, 8 feet;

Distance from centre of driving axle to centre of trailing axle, 9 feet;

Size of crank pin journals in each wheel, 4 inches diameter, 5 inches long;

Radius of cranks, 10 inches;

Diameter of wheels, 5 feet.

The coupling-rod section is to be designed so that at a speed of 60 miles per hour the maximum stress due to the inertia forces alone does not exceed 5.5 tons per square inch.

Amongst the drawings you make include one showing the crank pin in the driving-wheel fully dimensioned, taking the width of the hub as 7 inches face to face.

Draw the details of the rod to a large scale, and in particular show clearly the method you propose to use for the lubrication of the journals.

You may assume the section of the rod to be rectangular. The density of the material is to be taken at 480 lbs. per cubic foot.

You need only make calculations regarding the inertia stress for the length of the rod, which is 8 feet centre to centre. The other length may be of the same section.

3. A hydraulic crane is required to lift 1 ton through a vertical height of 24 feet. The hydraulic cylinder provided is placed horizontally on a concrete foundation, and the stroke of the ram is 4 feet. The working pressure of water in the supply mains is 700 lbs. per square inch. Design the cylinder complete, with the chain pulleys attached to the cylinder and the ram. Show the cylinder in section and bolted down to the horizontal concrete foundation. You are not required to show any of the details of the crane itself. The controlling valve must be shown in section, and the way the ram is brought back after a lift must be clearly indicated.

SUBJECT III. BUILDING CONSTRUCTION

AND

DRAWING.

INSTRUCTIONS.

Read the General Instructions on page 3.

The questions may be answered in any order, but each answer must be clearly marked with the number of the question to which it refers.

Drawings must be made on the single sheet of drawing paper supplied, beginning on the side marked with your distinguishing number, which must face you at the right-hand top corner. Sketches may be made by hand on the squared paper attached to the drawing paper. Where the instruction in the question is "sketch," the sketch may either be in pencil or the pencil sketch may be gone over with the ordinary writing pen and ink to make the lines clearer. Additional foolscap will, if necessary, be supplied to you by the Superintendents.

The tracing is to be drawn on the piece of tracing paper attached to the drawing paper.

Answers in writing must be as short and clearly stated as possible, and the references to drawings and sketches must be made absolutely clear by letters or numbers.

The questions marked (*) have accompanying diagrams.

Stage 1.

You must not attempt more than seven questions in all, and of these No. 1 must be one; that is to say, you are allowed to take not more than six questions in addition to No. 1.

The examination in this subject lasts for four hours.

*1. Make a neat tracing in ink of the drawing given, with the writing and figures: the lines should be firm and solid and should finish exactly at the proper points.

(15)

2. What are the special characteristics of the following woods, and for what purposes would you use each :-- Pitch piue, oak, teak, white deal, elm? (15) 3. What is the meaning of the following terms:-Struck joint, closer, splayed heading, cantilever, tilting fillet, rebate? Illustrate your answer by rough sketches. (12)

4. A gable wall of common rubble stone has a wrought stone coping with a pitch of 45 degrees. Draw to a scale of in. to a foot sufficient of the elevation to show a skewcorbel; a kneeler; the intermediate coping with its joints; and a portion of the rubble work.

(14)

5. The woodwork for a lead flat is described as being "firred to fall 1 inches in 10 ft." What does this mean, and how is the operation carried out? Draw half full size a section through the drip in such a flat. (12) 6. Draw to a scale of 1 in. to a foot a plan of a chimney breast 2 ft. 8 ins. wide between jambs, projecting 14 ins. from a 14-in. wall, with two flues from rooms under on one side of the breast, and one flue on the other. (14) 7. Draw half full size a horizontal plan through one side of a deal-cased frame with 2-in. double hung sashes, showing all details. (12) 8. Sketch on your squared paper the full size section of a bar of angle iron 4 in. by 4 in. by in., and calculate its sectional (12) 9. Give a dimensioned sketch of a bricklayer's hod, and state how many bricks it will hold. (12) *10. In the diagram (Fig. 10) A represents the plan of a valley between two roof planes: describe how the slates are cut and fixed and how the water is prevented from soaking through the roof.

area.

(14)

11. A gauged brick camber arch has a span of 4 ft. and a rise of 6 ins., and is 12 ins. wide on face. Draw the elevation of the arch to a scale of 1 in. to a foot. (14) 12. Describe the lathing and plastering of a stud partition, and give the composition of each coat in three-coat work prepared for papering.

(14)

Stage 2, Stage 3, and Honours.

You may take Stage 2, or Stage 3, or, if eligible, Honours, but you must confine yourself to one of them.

A table of logarithms and functions of angles and useful constants (see pages 286 to 291) is supplied for each candidate on whose behalf application has been made for a paper in Stage 3, or in Honours.

The examination in this subject lasts for four hours.

Stage 2.

You must not attempt more than seven questions in all, and of these No. 21 must be one; that is to say, you are allowed to take not more than six questions in addition to No. 21.