e. Plan and section of a spherical valve and seat. (the scale.)

f. Section of the cylinder and slide valves of a locomotive. (Double the scale.)

g. The two excentrics on the axle of the driving-wheel of a locomotive with the link for reversing the motion. The link to be shown at the right distance from centre of axle. (Scale, or 1 inch to the foot.)

When a plan, elevation, or profile of the same part are given, the candidate may omit one if he pleases, but that only which is marked with an (*), and he must understand that such omission will diminish the credit materially.

Honours Examination.

INSTRUCTIONS.

By well considering the question he is about to construct, the candidate will be able to get all his work, without any crowding or confusion, on the four pages of the paper given out to him, for he must understand that no second sheet will be allowed him.

The candidate may answer as many of the following questions as time will admit of; his answers to consist, generally of illustrative sketches of the subject of the questions, with so much writing only in addition as is necessary to explain the sketch, or to complete the answer. The sketches must be in tolerably correct proportion, but need not be to scale, nor show any detail of construction.

In all cases the letter distinguishing the question must be placed before the answer on the worked paper.

Four hours allowed for this examination.

p1. Show the general principle of a wind-mill, explaining the self-acting mechanism by which the vanes are brought to face the wind as it varies in direction.

p2. Explain the distinction between-1. an over-shot; 2. an under-shot and a breast water wheel.

p3. Explain the mode of applying steam to produce the motion of a piston.

1. In the old atmospheric engine (Newcomen's).
2. In the double-acting condensing engine.

3. In the non-condensing high-pressure engine.

q. By what arrangement is the steam admitted alternately to the two ends of the cylinder so as to act on the piston, as—

1. In a common slide valve, as of a locomotive.

2. In a balanced valve.

3. In an oscillating engine.
4. In a rotatory engine.
5. In a four-way cock.

r 1. Explain the principle of―

1. Watt's parallel motion.

2. The modification used in marine beam engines.
3. The grasshopper used in marine engines generally.

2. How is the use of a parallel motion dispensed with? 1. In Penn's trunk engine.

2. In ordinary stationary high-pressure engines.

3. In the common single-acting pumping engine.

s. Explain how the alternating right-line motion of the piston rod causes a continuous circular motion of a fly wheel.

1. By the crank and rod.

2. By the Sun and planet wheel.

s2. How does the fly wheel produce an alternating motion of the slide valve?

t. By what contrivance is a "tool" of any kind stopped without stopping the engine which drives it, and how is the action reverse 1 under the same circumstances?

u. Explain how a return motion with a greater velocity is produced by means of

1. Toothed sectors acting on racks.

2. Pinions so acting.

v. Explain the construction and principle of

1. The common governor.
2. Garret's ring governor.

3. The differential governor.

w. Explain the principle of a coupling.

1. When the connexion in the shaft can be made, or broken without stopping the engine.

2. When the direction of rotation is to be reversed by means of the coupling as in a nut screwing machine.

x. Explain the mode of governing the feed of the tool in Whitworth's drilling or slotting machines.

y. Explain how a very gradual change of velocity is produced by means of conical whorves in spinning machinery.

This portion of the paper the candidate is to work at home. The drawings, &c. are to be returned to the Secretary, Science and Art Department, by the 22nd May. They need not be prepaid.

The candidate is expected to give, from the following description, a design, consisting of a plan and elevation, with detached figures of details, for a hand turning lathe for wood, ivory, or metal.

The frame to consist of two standards of cast iron held together about four feet apart by three ties, one of which is to serve as the axle of the driving wheel, another as that of the treddle, the third is to form the bed plate of the lathe; these to be designed so as to answer their respective purposes, as well as to render the whole rigid; a puppet carrying the axle of the pulley and mandril to be bolted to the bed plate, the other puppet to be moveable along the bed plate in a slot, and to be clamped in any position by a hand wheel and screw on the under side, the axle for holding the work to be capable of nicer adjustment for distance by another screw working in proper collars, and acted on by a hand wheel at the end.

The driving wheel and pulley to have four V grooves of the usual construction for a catgut band. The wheel to be driven by a crank on

its axle, and crank rod. The slide rest to admit of adjustment to a ny angle for face work, and to be made so as to carry a fixed tool moved by a handle and screw for metal turning.

A rack for tools and other purposes to be bolted at the back of the frame, and the whole machine to be designed without reference to expense, as to the finish of the work; and all the details of collars, brasses, bushes, nuts, &c. of the axles, puppets, and rests to be shown in detached figures.

The following voucher must be signed and returned with the worked drawings:

I,

hereby certify on my honour that the drawings sent in by me for the Honours Examination in Machine Construction and Drawing have been done wholly by me, and without assistance from any person.

(Signed)

SUBJECT III. BUILDING CONSTRUCTION.
EXAMINER, PROFESSOR T. BRADLEY.

First Stage or Elementary Examination.

INSTRUCTIONS.

The candidate is expected to prove his knowledge of construction, as well as his power of drawing neatly to scale; he is therefore to supply all details omitted or misrepresented (intentionally) in the sketches.

The detached figures marked A, B, C, are intended to show details of construction which the smallness of the scale did not admit of; but these figures are not to be drawn separated from the subjects they illustrate.

A little consideration will enable the candidate to arrange the figures the time will admit of his drawing, without crowding or confusion, on the one sheet of paper first given out to him, for no second one will be allowed him.

In all cases the number of the question must be placed before the answer on the worked paper.

Four hours are allowed for this examination.

ELEMENTARY COURSE.

1. Front elevation of a wall three bricks thick, with brick_quoins in English bond, and flint facing; scale, that of sketch, and a plan of two courses to be added.