10
THE CHINA MAIL,
THURSDAY, AUGUST 9, 1928.
EN THE MOTORISTS' PAGES
COMFORT
POWER and SPEED
with SILENCE,
SAFETY and ECONOMY.
THAT'S
B. S. A. MOTOR CYCLES
THE MOST RELIABLE OF ALL MACHINES;
COME & SEE THE MODELS IN STOCK.
THE SINCERE CO., LTD.
SOLE AGENTS.
AUTO-TOTAL
AGENTS:-
THE MOST EFFECTIVE FIRE EXTINGUISHER FOR
MOTOR CARS
NO PERIODIC REFILLING.
Contents Never Deteriorate. Harmless to Upholstering, Machinery,
Or Rotative Parts. Contains no Grinding Properties.
KELLER, KERN & CO., LTD., 16/19, Connaught Road G.
BUYERS GUIDE
MOTOR CARS.
ARMSTRONG SIDDELEY.-Hongkong Hotel Garage, Queen's
Road. C.4759.
BUICK-The Dragon Motor Car Co., Ltd., 83 Wong Nel Chung
Road, Happy Valley. C.1247... CADILLAC.-Hongkong Hotel Garage, Queen's Road. C.4759. CHEVROLET.-Hongkong Hotel Garage, Queen's Road: C.4759. CHRYSLER A. Lung & Co., 19, Queen's Road, C. Tel. C. 1219. HANOMAG. Wai On Tseung, Ltd., 243 Des Voeux Road, C.
Tel. C. 711.
MORRIS Hongkong Hotel Garage, Queen's Road. C4759. OAKLAND.-Lane, Crawford, Ltd.
OLDSMOBILE-The Dragon Motor Car Co., Ltd., 33. Wong Nei
Chung Road, Happy Valley. C.1247.
PACKARD. The Dragon Motor Car Co., Ltd., 88 Wong Net Chung
Road, Happy Valley. C.1247. PONTIAC-Lane, Crawford, Ltd.
ROLLS-ROYCE-Hongkong Hotel Garage, Queen's Road. 0.4759, SINGER--Gilman & Co., 4a, Des Voeux Road Central. STUDEBAKER.-Hongkong Hotel Garage, Queen's Road. C.4759. VAUXHALL-Lane, Crawford, Ltd. WHIPPET.-Gilman & Co., 4a, Des Voeux Rd., C. ^ WILLYS-KNIGHT.-Gilman & Co., 4a, Des Vinx Rord Central.
MOTOR TRUCKS AND TRACTORS. CHEVROLET-Hongkong Hotel Garage, Queen's Road. C.4769. - G.M.C.-The Dragon Motor Car Co., Ltd., 38 Wong Nel Chung Road,
Happy Valley. C.1247.
GUY-A: Lung & Co., 19, Queen's Rd., C. Tel. C. 1219, MORRIS-Hongkong Hotel Garage, Queen's Road. C.4759, STUDEBAKER—Hongkong Hotel Garage, Queen's Road. C.4759, WILLYS KNIGHT TRUCKS.-Gilman & Co., Ltd., Des Voeux Rd, C.
· MOTOR CYCLES.
B. S. A The Sincere Co., Ltd., Des Voeux Road: C:1067. ROYAL ENFIELD-The Dragon Motor Car Co., Ltd., 85, Weng Nei
Chung Road, Happy Valley. 0.1247.
TYRES AND ACCESSORIES.
ACCESSORIES-Hong Kong Hotel Garage, Queen's Road, C.4759. ACCESSORIES.-The Duro Motor Co., Nathan Road, Kowloon, K.228. AUTO-TOTAL FIRE EXTINGUISHERS Keller, Kern & Co., Ltd.,
18-19, Connaught Road, Central.-
COLUMBIA BATTERIES-The Dragon Motor Car Co., Ltd., 88,
Wong Nel Chung Bond, Happy Valley. 0:1247. FIRESTONE TYRES The Dragon Motor Car Co., Ltd., 88, Wong
Not Chung Road, Happy Valley. C.1847.
MILLER ACCESSORIES, A. Lung & Co 19, Queen's Ed., C
Tel C.1219,-)
MILLER TYRESA Lung & Co., 19, Queen's Rd., C. Tel C.1219. PRESTOLITE BATTERIES-Hongkong Hotel Garage, Quee
Road. CATREAM W
WHY FLATS OCCUR.
THE PROBLEM OF THE SOLID TYRE.
NEW SOLUTION.
A problem which has beset many an owner of solid tyred commercial fleet In the motors, whether
TYRES NOT TO BLAME.
To discuss briefly some of the at- tempts at the solution. of the pro- blem, we believe we are right in saying that, when a tyre wears into Dats, that is no evidence that it is defective. With modern methods of manufacture, a solid tyre could not have soft places, and to produce a tyra which is not uniform is, now- adays, quite impossible.
As to the accidental presence of
or in the single vehicle a spongy place or of a large air bub
ble, whilst neither of these is Im- category, has been the occurrence
possible. of occurrence, neither is of flats at practically regular inter-very probable, and, if it should oc vals on the treads of the tyres on cur, it could easily be recognized.
There would, moat likely, be the front wheels.
burst through the side of the tyre long before a marked flat could be produced.
5
Again, no difficulty is found in diagnosing the trouble when a fiat occurs in a region where the base of the tyre is damaged, as by the deep embedment of a stone or piece of metal, or a tyre may be undercut and partially detached from its base; but all of these things occur
If there were any defects in the
The flats are always of much the same shape on a given tyre, explain Dunlop Company experts, but, as between one tyre and another, and as between the tyres on one vehicle and the tyres on another (even when the vehicles are of the same make and type), the shapes of the flattened portions vary ma-in use, and the causes are obvious. terially. In some сдвев they are liver-shaped, disposed across manufacture of a tyre, at any rate, it is inconceivable that they could the surface of the tyre, spreading occur at the regular intervals at acarcely any wider as the tyre be- which the flats usually appear; and comes worn; in other cases, the flats when cracks are found in the sides will take a diagonal direction across of a tyre close to flats, they are no the tyre, sloping first in one direc-doubt due to abnormal distortion tion and then in the other. A cross-of the rubber, beyond its breaking section taken of a tyre, in the strain, when the lower portion of middle of a flatted portion. will the fat hits the road. often show that one side of the tyre has become worn down more than the other, producing a pronounced As to the defective wheel theory, lip on the lesser worn side.
however untrue wheels might be, Invariably, however, the flatted and it is doubtful if they are un- portions are practically symmetri-true, series of 8 or 10 equal and cal, and are equidistant around the equidistant flats could not, due to periphery of the tyre.
this cause, occur so. consistently. Again, experiment has shown that the flats do not tally with spoke For a long time it seemed impos-heads, and tests have proved that sible to discover how and in what tyre bands are seldom out of cir- circumstances these flats occurred. cularity when they are received for At first, the tyres themselves were retreading.
-DEFECTS.
WHEEL DEFECTS.
suspected. It was imagined by Impact tests have been made on the users that there was some phase tyres, but, whilst slight sets have of the manufacture of tyres where heen produced, no flat has ever been unevenneas could occur. Air holes detected, and it would seem that at- and porosity in the rubber were attrition must be present. This at tributed as the causes, and then it trition, however, can certainly oc- was contended that a tyre must cur when there is any backlash in become separated from its volcanite the steering, and the clue to the base, perhaps to an infinitesimal problem can be found by watching extent, but sufficient to allow it to the front wheels of a steam waggon, deform under load and during rota- having central pivot steering con. trolled by worm and segment
tion.
It was pointed out by those who through chaine. An observer, sta- favoured the "defective tyre" solu- tioned to obtain a good view of an
*SLACKNESS.
1
Haven't you always wanted a car where the comfort of an arm chair was maintained mile after mile, throughout a day of rapid travel, over roads both good and bad ?
In the New Oldsmobile. Six there is room to stretch your legs, the seats are moulded to the form of your back. Springs are long and wide, and the hydraulic shock absorbers remove even the small jars.
Here you have comfort and riding qualities built right into the car. They will not vary as you flash; care-free, past thou- sands and thousands of milestones.
Touring Roadster Sedan (2-door). Sedan (4-door)
M$2,500.00
.M$2,500.00
.M$2,600.00
.M$2,800.00
THE DRAGON MOTOR CAR CO., LTD.
Telephone Central 1246 Telephone Centrel 8500
33 Wong Nei Chung Road. 13 Des Voeux Road Central.
YOU CAN BUY A NIGGER CAR BUT NOT A BETTER ONE.
Con-
tion to the problem that cracks were approaching waggon, will see the to divide regularly into the new cir to be discovered on the side waile of wheels turn in and out, the slack of cumference. Then, Instead of tyres in the region of the flats. one chain being taken up, and at the general (but rapid) wear, there is
Then arose a school of thought limit of slackness, a jerk being localized wear of flatting. which favoured defective road con-given to the wheel, so that it turns versely, as a tyre wears, flatting ditions as being the prime cause. the other way and takes up the will cause (flats will disappear) and Wave lines on the road were demon-slack of the other chain, after general wear take place instead. atrated to set up excessive wear.on which the operation is repeated. Sometimes a change of tyre will the tyres at certain points of con-Action and re-action are thus set result in a cessation of flat produc- tact.
Then pot-holes were placed up, and the result is a constant and tion. This is explainable by the in the pillory, and, again, to the regular side twist or slide of the fact that a tyre, perhaps a little variation in road surface conditions wheel, which must cause attrition softer or harder or of different -being wet and dry alternately-of the tyre.
shape, placed on that wheel may was ascribed the fault.
destroy the regular periodicity of But, throughout the whole of 1,c discussions centring about these! In the case of the Kirkstall or the impulses. There is a known theories, the simple facts remained American type of steering, the near-case where the substitution of a (1) that the flats did not occur on side wheel is more firmly held than tyre of the fire-engine type for a tyres in use on rear wheels; (2) the other and the tyre on the off- tyre of standard section altogether they would not appear when tyres alde wheel often, shows signs of cured the tendency to produce flats. were used on some vehicles, and more wear. With the Ackerman would occur at once if the tyres steering, släckness can develop in
Let us now examine the possible were changed over to other. vehl the joints, and there will be caused a cles; and (9) moet mysterious of variation, or a series of variations, Causes. They are (taking both ail, a series of flats appearing upon in the direction and nature of the front and rear wheels into consi
deration) a tyre would commence to disappear rotational, impulse received by‚a
(1) Loose wheel bearings; (2) tyre. An impulse variation may be as the tyres wore down...
Another curious fact was noticed, up and down, or from side to side, untrue wheels (eccentric or wob- namely, that grooves would develop or a combination of both, but it is bly); (8) weak and springy fel- on the surface of tyres of a section certain that it is there.loes; (4) play in steeering gear, and The affect of this, variation is steering pivote; (5) worn shackle of 180 mm. Then pits would form across the grooves, at more or either to spread the tyre at the pins (6) Jodse spring attachment leas regular intervals, round the moment of Impulse or actually to to axles; (7) axles not parallel; (8) slide it on the ground. If the tyre unequal chain tensions (in chain- tyre,
POSSIBLE CAUSES..
EVERYONE ADMIRES THE 1928
RALEIGH
VALUE
COMFORT AND
The wheels themselves now began be merely spread, the surface at driven vehicles); (9) eccentric to be suspected, and it was urged that point tende to wear more rapid brake drums, resulting in uneven that, in those of larger diameters, ly, and, if it occurs in one place, a grip of brakes; (10) one brake act- it was most likely that they were single flat is slowly produced. This ing before the other; (11) in tyre not truly circular, or that the fel-fat will introduce another impulse Afting the use of packing in one or loes of them were weak, allowing varlation (or jump), which may two spots fnstead of a uniform
layer. them to spring between the spoke cause another flat, or on the other henda, men de hand, the jump may so alter the first To all of these points special-at- Naturally, alignment of wheels impulse that it no longer occurs at tention should be directed whenever was suspected, and slackness of the the original place, and the first flat hats are found to occur or tyre bearings, or their misalignment, may, with the general wear of the wear appears to be excessive-for was pointed to as a possible cause, tyre, disappear, only to reappear in the latter must be regarded as equal
to a large number of flats, all of woo but a theory disturbing fact was another place to
QUALITY
SPEED
THAT'S ALL YOU NEED
Illustrated catalogue Free.
RIDE AS YOU PAY !
ON VIEW
A LUNG & CO.
19, Queen's Road, Central. Tel. C. 1219,
THE CHRYSLER,
AERIAL PROCESSION FROM
-- FOLKESTONE.
CAPE TO CAIRO.
were met by the Union High Com misaloner and later entertained to dinner at the Criterion. The pro Cession was filmed and the film is how in South Africa awaiting, re- lease, MD ENN
* Upon arrival In England, the car She was examined at Kow and wALS
It is Writing from London, Mr. O. C. found to be in good condition.
the Infinitely greater frequency When series of impulses is them arising from attr
to remember that Clow tolls an interesting story of cylinder head, to use Mr. with which the defects occurred on received during one wheel revolu also important
time
ervals, the
from one the arrival thare of the Sunday Clow's own expres ouble may arise, front, wheel tyres. When fate oc flon, and
of the causes est
bove, but Times and Rand, Dally curred on rear tyres they could serien of flats may be
does from a combination nearly always be traced to admitted if the defects in the mechanism or mode not divi
will: the
of driving. Harsh brake applica tlom by locking the wheels would result in tyre abrasion, and the flat thus cau would Wheel to
bound-and-
the
Faccurately
Cape to Cairo
tyres, The
picture, showing and the valves and
tion The only parts affected
one rear wheel bes
опе
the
which
Londo