1931-04-09 — Page 11

THURSDAY, APRIL 9, 1931.

THE MAGNETO.

t other elge touches four other terminals (in the case of a four- From ylinder engine) in turn.

THE CHINA MAIL.

8,000 MILES.

Lecture to Automobile each of these terminals a heavily Epic Journey by Two

***

ot

Club.

wires

The Armature.

-sume

the and they are wound

is known ai amatore."

The

placed between

011

were

Safety Spark Gap.

insulated top

con-

two

an ab.

Lady Drivers.

that

was

It is interesting to nole everything in the expedition British, from the 710 x 90 Dunlop tyres to the Shell petrol and used throughout the trip,

of i

oil

The route chosen was via Johan- nesburg, Abercorn, Nairobi, Juba,

Wadi-Halfa, Khartoum,

Aawan, Alexandria, and then, after a trip the Mediterranean, acroas Europe to Calais and 40 to the Cowley Works. which, of course, are close to Abingdon, Miss Bel-

her's destination.

on

of

The Karroo,, 200 miles out Cape Town, gave the drivers the

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THE

DRAGON MOTOR CAR CO., LTD.

Telephone 30228.

33, WONG NEI CHUNG ROAD, HAPPY VALLEY.

lasulated wire is taken, one to the centre 'electrode of each plug, and

A journey which not only testi- Lecturing on "The Magnets" at us the frame of the plug is screw- the Royal Automobile Club, Perth,, fnto the frame of the car we fles in no uncertain manter to the W.A., Mr. Mason, the club techni- have a complete secondary circalt prowess, courage and powers

between endurance of the fair sex, but is the cul adviser, said that it had been broken only by the gap explained at a previous lecture he plug points. Let us now con- also a standing tribute to that if a bar of hard steel were siger both circuits together. The quality of materials and all-round bent into the shape of a horse-shoe Primary circuit was broken due to reliability of Morris cars, was re- and then magnetised, it would be-points of the make and break cently accomplished by the Misses being separated. The current in Belcher and Budgell, who have re- come a permanent horseshoe mag-the circuit dropped to zero, cently arrived in Britain, from the net, and there would exist between

set the poles of that magnet a "fielding a collapse of the Beld of Cape of Good Hope. of force." It was also stated that free cutting the secondary circuit, These two intrepid women

a 1924 second-hand-onе one of the methods of producing a with the result that a high tension at in

which and Morria-Oxford,

already enrrest of electricity was to cause rent was set up at that moment might easily say very second-hand a wire (that wire being part of a the secondary elreuit, circuit) to eat through a field of travelling that cireuit jumped the had twenty-five thousand miles to fores It should be remembered p at the plug points in the form ita credit under arduous conditions at the Cape, to journey to Abing- that these induced currents will spark.

on, in Berkshire. only be set up when the wire is

The safety spark gap consists of The fact that no mechanical at- 1:11 route. cutting across the path of the lines of force, If the wire is moved in a little chamber formed on top of tention was necessary

that occasioned by the field and parallel to the lines the armature cover plate with a other thun

Into purely accidental circumstances, is of force there would he no result. top of insulating material.

im the top and bottom of this cham- striking testimony to the quality of He requested his audience to

The the workmanship and the materials agine that two wires be made to her, spark terminals are set. rut the field of force at the same spark terminal in the bottom is, of used of six years ago, since when

that in Morris cars have steadily been get time, one up and one down, and course, grounded and

ling better. that the two wires were part of

All British. A current would neeted with the high-tension con- The game circuit.

connector. how around the loop, but the cur-tact brush by a strin rent would exist only during that other words, the safety gap is shunted across the secondary cir time in which the

ruit. The gap between the moving.

terminals a longer than the gap between the spark plug points, and In the magneto there are a large ordinarily no spark will pass be But if. aber of these loops of wire (all tween these terminals.

no circuit)ving to unusual conditions,

what spark can pass at the spark plug #shuttle type and the electromotive force in the

is secondary winding attains armature the

of normal value, a discharge will oc pales the marnet and carried at either cur at the safety spark gap, there- non hall bearings, whilst a by preventing the secondary cur- hat onerts 2 to the engine of rent from rising sufficiently high the As the engine is to jump the insulation, of turned over the armature is made secondary winding. The width of to revolve and the wires cut across gap should be 5-16 of an inch to the Beld of force. One end of this 3-8 of an inch, and, of course, is

treacherous sand, were among the wire tknown as the primary wind-always more than the width of the -bridged dongas, boulders and difficulties they encountered, ing) is attached to the armature of spark plug gap, otherwise the the magneto and a carbon brush spark intended for the plug would

which, on arriving in the Tan- reating on the armature continues occur at the safety gap. The purganyika Territory, became steadily! the eircuit to the frame of the pose of the safety spark gap worac. angneto. The other end of the that it is practically a safety valve lf. winding is connected to long for the high-tension current. serew which connects with one; for example, a wire became de- contact of the make and break. Lached from the sparking plug or Balors Flats-low bush country the When the points of the make and from the distributor so that the surrounded by hills-held up break are closed, connection exists' ordinary path of high-tension eur- expedition for seven weeks, since to the base plate of the make and rent was barred, there would be heavy and late rains had trans- break via the bell crank arm, and considerable danger of the current formed the district into what was through a carbon brush which is forcing a circuit through the in virtually an inland lake.

Even after the Flats had dried mounted behind this plate to the 'sulation of the armature, and thus frame of the magneto. Thus we doing very considerable damage, sufficiently to enable the car to pro-wo facts combined to tip "Bohun- easier ceed, it was found that the road in kus" head first into the stream, we have a complete primary eir were it not ruit.

escape. In order to protect the in- places had been completely wash-from which, however, he (or is a worso willing natives very little In the actual magneto the por sulation of the armature and all, ed away. Often the car was axle-car "cho"?) was dragged forth by tion of the primary circuit which other parts from injury due to ex-deep in mud.

owner cessive voltage, a safety-spark gap In this neighbourhood, too, lions for the immersion.

Another thrilling incident which may be repaired by the driver, and which is frequently the, is provided to permit the passage were encountered for the first time, cause of magnete failure, is the of the current to ground without and the couple were destined to bade fair to put an end to the ex- "make and break assembly" or injury, The current will pass make their closer acquaintance in pedition occurred In the Soudan, when a back-fire, the intense heat, at They crept around "circuit breaker," and for this across the safety-spark gap in case Kenyn. reason the lecturer dealt with it a high-tension cable is disconnect- night, growling us they prowled, and carelessly filled tank, cóm- in detail.

Fortunately, as most people know. It consists of aed, if the spark plug is too great, frequently coming close up to the bined to set "Bohunkus" on fire. sand is the most conspicuous stationery insulated contact point, or if for any other. reason

feature of the Soudan, and a very little suffleed to smother the flames, although time was lost in subsequently getting rid of it and ensuring that none had penetrated Where Pharaohs Dwelt. From the Soudan onwards the

indeed, this stretch of the journey journey was without incident and,

relics redolent with

of the Pharaohs was one of the happiest of the trip.

Across France and onwards

the color car.

3

Kiven Bome

magneto from

cover

is

first taste of some of the conditions

that lay before them. Roada little better than corrugated cart racks,

Delayed By The Rains. Further ០, the well-known

sank

a

made with pro-

to the sump.

the car to discover what was in the (A) and a movable contact point spark-plug gap or distributor eir- lean-to tent in which the drivers slept, or rather, where they lay B) on one arm of the bell crank cult is open.

i C).

anxiously awake. Both of these parts are.

Ignition Switch. mounted on brass disp (D).; It is necessary to be able to stop After negotiating these treacher- which is securely fastened to the the

producing ous Flats, n cloud-barst was en- armature shaft and rotates with sparks when it is desired to stop countered in the mountains, trang- it. The stationary contact (A) is the engine. To this end a strip of forming the road, such as it wae, insulated from the supporting disc, metal is taken from a terminal set into a quagmire. The car

of the circuit-axle-deep; and the more they dug (D). whilst the movable contact into the (B) is in metallic connection with breaker and made to reat on the the deeper "Bohunkus" went. The it, and the disc (D) is grounded to screw which connects the primary kit had to be unloaded while the frame of the magneto by a car, winding to the circuit breaker. "corduroy" road was bon brush fixed behind, the disc. From the same terminal a wire is poles cut from the bush, a The circuit-breaker is surrounded; Laken. to the switch, and when the redure eutailing hours of work by: a band of natives which had to be by a cylindrical housing (F) to the engine is running this switch la

which

able to show a clean pair of heels interior surface of

are open, and the primary current recruited from the neighbourhood. from Calais. "Bohunkus" was still

Frequently only twenty-five or secured steel cam blocks (G and parses through the make and break

long and gruelling journey and G1). Ordinarily the two contact points. When it is desired to atop thirty miles would be accomplish to many larger cars, despite its points (A and B) are kept in con, the engine the switch is put into ed in the day, and the twain, worn the little attention it had been pos- tact by a spring (H). As the dise the "off" position and the awitch out with twelve hours' continuous

oiling and greasing. (D) retates, the outer arm of the becomes closed, so that the centre exertion, would fall asleep after gible to bestow even, apart from As Sir William remarked when bell crank (C) comes in contact contact of the make and break is their evening meal, heedless of the

he received the Misses Belcher and with the cam blocks (G), whereby now. connected to earth and even imminent danger from wild beasts the contact points (A and B) are though the points open, the cur-and natives alike.

Once in Kenya the road improv- Budgell, the doughty pilote, there separated momentarily, so break rent does not collapse in the! ing the primary circuit. Immedi- primary winding because an alter-ed considerably, and for timid is a saying in England that the a second-hand one. "Bohunkus" ately the primary circuit is broken, native circuit exists.. It may there- companions the expedition had next best thing to a new Morris is

zebra, wilde-beeste and

has undoubtedly borne out this as- the current in that circuit drops fore be said that the switch when buck,

2 shy to zero, causing a collapse of the in the "off" position maintains a giraffe und occasionally Iines of force thrown out by that continuous primary circuit so pre- jelephant. Uganda too, although a Bertion to the full-The Morris

any native protectorate, provided the curront. As in coil ignition a con- venting, the setting up of

Mr. Mason party with some of the best roads denser is connected across, the secondary current. points of the make and broak te then went on to explain what to throughout the trip, making a

of a The enthusiastic prevent arcing at the points. look for if a spark should not occur hundred miles a day possible with-

out fatigue. at the plug points.

It is Interesting to learn that, 1928 Morris-Cowley model-Mr. K. Over the primary winding of the armature is wound a secondaryį

generally speaking, the natives H. Bailey, of N'Kana, Northern were frienilly and courteous. In- Rhodesia has written as follows winding. This is made up of a

deed, on one occasion a local chief to Mesare. Fath & Co., Morris Dis- very large number of turns of fine

was so perturbed at seeing two tributors for Bulawayo and dis-

trict .wire. The beginning of the

The driver of a Thornycroft two white women, alone that he sum- secondary winding in connected to the end of the primary winding, ton van in the employ of Messrs. moned five of his warriors and "You will perhaps be pleased to and since one end of the primary Allen-Liversidge, Ltd., the well-posted them as guards outside the hear that this car has now com. the pleted over 12,000 miles and bes Under winding in earthed the secondary known lighting engineers of Liver-hat he had given them for

given every satisfaction. pool, was given orders to convey a night. la also earthed through the

It was in Uganda that trying conditions it has primary. The end of the second-load to an out of the way village

“Bohunkus" fell off a rough pon-averaged 30-m.p.h, and during a ary, winding leads to an insulated in North Wales.

Nearing his destination, and in- toen into the river. The approach run from Kapiri Mposhi to Maza- contact ring which is fastened to the armature. This is called the quiring his road, he was misdirect- was very steep and the pontoon and buka, 210 miles, took me at an "collector ring" or "slip ring." ed along a lane which became nar gangway old and rotten. Resting on that ring is a carbon rower and steeper as he proceeded brush. This is fitted Into a ter- until it deteriorated into a rough

Secondary Circuit.

i

OVER THE TOP WITH A THORNYCROFT.

minal, which is rigidly fixed, to the single track, leading eventually in-

Overseas Mail.

IN RHODESIA.

owner

These average of 20 m.p.h., including

istops.

In the whole time I have owned the car the engine has never

I have no faltered, and repairs have been doubt that for the motorist who quite inconsiderable.

economy An upkeep and running Comfort

frame of the magnets (though into the famous Bont Newydd Hill. in first gear, and made a non-stop sulated from (t), and from the Having arrived so for the driver climb right over the top with its upper end of this terminal connee had no alternative but to tackle load of approximately 35 cwts. tion is taken to the centre of the this mountain track, which has a The driver had the satisfaction domands distributor panel by means of a wide reputation as an official test of learning he was the frat to and Fod of metal known as a "pencil." hill for motor cycle and car re- climb this Boat Newydd Hill on a freedom from the necessity of Hebility trials, and a sinister, one commercial vehicle, and sent the visiting a specially equipped Inside the distributor panel a cars at that for weeding out the units, manufacturers a most appreciative garage for all minor adjustments, bon brust is made to revolve, being The hill has two rute bends with letter certified by the signature of the economy, reliability and acces fixed to a toothed wheel, which is in mesh with another toothed wheel ditches ou either side, and a a witness who was present, to excessibility of this car will take a attached to the armature. As the gradient of 1 in 6, but the driver's press his appreciation and a lot of equalling brunk revolves one edge of it is in confidence in his Thornycroft was, tonishment at this outstanding per- "It is disentially a car for keeps,

of vihillested, for the formance. his Thornycroft not for exchange at the end of the completely cominnal contact with the centre plate of the distributer panel and vehicle set Its teeth so to speak, vedeles

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SOUTH CHINA MOTOR CAR CO. 33, Des Voeux Road Contral

Tel 25644.

Tel. 25644,