Was
MOTORING
SUPPLEMENT
·LOCAL MOTOR NOTES & NEWS
In
evor
or and stones.
•
OF.
THE HONGKONG TELEGRAPH. SATURDAY, the 24th. May, 1924
(Being the Oficial Organ of the Hongkong Automobile Association),
ABOUT SKIDDING:
CONTINUATION OF LAST WEEK'S ARTICLE.
the force
thoroforo
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Hydraullo conorato-This typi for the condition as tikon from the highway showed a cosmolent of friction of 783; after being subjooted to the cleansing action Also with nine different kinds of water and allowed to dry, this
In or
(4) Heavy rain, (5) Dry after heavy rain.
:
of foreign material prosent Includ-type showed ing mud, clay, oil, etc.
4
AMPHIBIOUS TRACTOR.
A water-going tractor, that has a land spood of 30 miles an hour, in hore pictured showing how it dan paddle along with big guns.
tho rate of speed and force wat to cɔrraspɔnd to the condition nocossary to start the tyre sliding of daw, cɔnfansod fog, or mist, the across the surface was observed. co-offiiont of flotion was .059; This force represented the forcowhon wat during the heavy rain necessary to overcome the frie-foon fitios the co-oflent of fric- In last Saturday's Motoring tion botwoon the tyre and the tlon was .030...
Asphaltic Shoot Surface. -This Supplement wo published the first pavement. From this force the portion of an article supplied us co-officiont of friction was cal-typ for the conlition as taken by the Road Materials Labora-culatod. The co-efficiont of fric-from the highway showɔd a 00. In this issue will be found the new Handbook, which is other tory of the Standard Oil Company tion offers a convenient nieasure lont of friction of 743; afcor on the causes of skidding and of a pavomont's skid resisting being subjected to the cleansing concluding portion of an article wise ready for publication.
action of water and allowed to how it can be prevented. The qualition. on skidding and its causes and,1
In order to duplicate most of iry, this type showed a co-officient after very exhaustive investiga-
is ap-the possible conditions in which of friction of .975. tion, it has been established that Many members of the Associa romainder of the article, giving
highways aro apt to be found in When this type of pavement was dirt and foreign substance onton have expressed their appro- interesting conclusions,
The remaining feature to be practica, each typo of pavemont wat to correspond to the condi- roads are far more productive of elation of the monthly illustrated ponded:---
production Asiatic Motor, prosont- In view of the fact that our Publieed to each member of the Associa consid-rod is the friction batwoen used was tested under fourloontion of dow, confasoi fog, or skids. than anything elso.
Anid on the rolation of various
Under various weather condi-was .592; when wat during the Works Department has so oftention. We understand that the May tyro and pavement. Much has been different conditions, as follows: mist, the 935ziont of friction heavy rain condition the coofici. types of pavement to skidding, tiene.. had pointed out to it the danger issue, will shortly be distributed.
and some have been lod to bellovo (1) Dry as taken from bighway. Jont of friction was 832, of sand-spreading it is to be hoped
With such heavy rainfalls dur-that certain typos of highway (2) Dew, condensed fog, mist that our officials in chargo of
or shower," roads will read the article and ing the past few days, motorists surfaces are conducive to skidd-
(3) Light rain, лго consequently spite are advised to look out for landing and profit accordingly.
been slides during this season. Al dangerous to drive upon. of
that has all
should be approached der to definitely decide this lato, corners Hongkong of said in
Is sand-spreading
just-
na with care, for one can never toll point, it was determined to con-
coefficient of the gonoral tendoney of all types tested, asphaltic concrete, hy- it what the conditions are like round duct a series of exhaustive experi- provalent to-day as
friction of 1.051. When this type of pavement to have a higher draulic conorato, Topeka, and and if accidents occur the corner. It will be remembered ments and obtain accurate in-
The tests shown here wore of pavement was wet to corres-coufficient of friction after being Sheet Surfoon, are safe pavements
cloanod. This brings out the when clean. through skidding on these sanded that last year the Castle Peak road formation on this subject.
SUMMARY OF CON- In considering the forces at made on four samples of hydrau-pond to the condition of dow, stretchen our P.W.D. ough: to be was closed for many weeks owing
CLUSIONS. hold primarily responsiblo. to heavy landslides and, although work in skidding, it is, evidentlio coneroto, four samples of condensed fog or mist, the coaffic fact that when clean the pave-
A careful roview of the fore- many of the dangerous bits of that the force which tends to asphaltic conureté, contao, aggra-lient of friction was 579; when ment is most resistive to skidding. hillside appear to have become cause the car to slide is opposed gato typo, three samples of as-wet during the heavy rain con- The many little sand or grit. par- In the city, when a road is sufficiently overgrown as to be by
of friction phaltic conorato, fino aggrogate dition, the coefficient of friction ticlos, together with such foreign poing facts brings out the follow-
matter as oil, olay and dirt, Ing conclusions: under repair, it is usual to leave held more firmly, very heavy between
tyro and
pavement.(Topeka) type, and two samples was 947.
(1)--The actual number of auto follows that if of asphaltic abect surfaco. Tho An examination of these results which aro presont before a rain lampa at night indicating to rains are at all times liable to It
mako the pavement slippory, roality a very small percentage rood users the danger of pas-dislodge large quantities of earth we can measure the friation average co-offoient of friction for indicates the following facts: or before the street is cleaned accidents due to skidding is in
oither one Rico sing on
It is at this season that exists between an autom-cach typo was used in tabulating 1.In all osses tho condition
(2) Recant developments In the other. Notwithstanding the of the year especially when obile tyre and any given surface, the results. It is well to romem-of dry after cleaning showed the This brings out an exceedingly of the total accidents. fact that our country roads are not motorists should drive with cau- we will have a mousure of the ber that the co-officionts of fric-pavement less slippery than as important fact, namely, the im
tion reduce the danger of skid- lighted by streat lamps as are the tion.
non-skid qualitios of the surface tion will vary somewhat with the taken from the highway. This portance of the foreign mattor in automobile dosign and construc
individual pavement, but the shows that the dirt and foreign kidding. city roads, there is a lamontable
A study of the values obtained ding to a fraction of the previous abaonco of any warning lights on
Motorists are warned to look It was decided that the most average results obtained here mattor presont on the pavement
(3)-The true slipporiness of those portions of the road which out for a herd of cattle that is accurate measure of the non-skid show very definitely what may before cleaning are important shows that the lowest coefficient hazard, are in the hands of the repairers. continually roaming about the qualities of various types of pave- generally be expected from each factors in determining the slip obtained in testing the various
typos of pavement whon.. wet paved highway dopanda not on porinose of a streot surface. The road to Castle Peak quite highway, either on the hill before ment could be obtained by making type of pavement.
The results obtained by testing 2.-The condition of dew, con- during a heavy rain was 0.833, the type of pavement but upon excellent otherwise-has of late Deep Water Bay or between there the test on a section of pavement come in for attention and patches and Repulse Bay. We understand taken directly from service con- the different pavements under dansed-fog or mist, produces the whereas the presence of foreign the presence of dirt or foreign have been re-surfaced and others that the local Automobilo Associa-ditions. Sections of
various various weather conditions may most slippery condition on all of matter was found to reduce the matter on the surface.
coefficient of friction as low as We may therefore say that the different pavement types. 0.221. Those Agures show that the following are the best safe- are still in course of treatment. tion is taking this matter up, as types of pavement surfaces wore be described as follows:
Asphaltic Concreto (Coarso Slight moisture loosens and Sometimes half the road width is the cattlo, of which there about accordingly taken from stroots loft extromoly "rough and
ton in number, constitute a and highways in widely-separat Aggregate-Type). This type for moistens the surface coiting of when a pavement is dioan its guards against skidding. First, by approximately 275 per cent, of complicated forces which tend to dangerous at night and never a distinct dangor to care coming od districts throughout Call- the condition as taken from the foreign matter and produces the coefficient of friction is increased uso proper care in driving so that warning light is placed there as upon them suddenly roundfornia. The size of the sections highway showed a co-efficient of most slippery condition.
3.-As the amount of rain or its coefficient of friction when cause skidding are not built up an indication to drivers. Surely
ranged from 15 to 30 Inches in friction of 0,806; after being sub- it should be possible when a road
length, and from 10 to 30 inches jected to the cleansing action of washing continues, the foreign foreign matter is present, with a Second, use the latest improved has to be loft like that overnight
It is not very often one finds in width. and great care was water and allowed to dry this type matter is removed from the pave-orresponding increase in rosist devices which have been provod the ecefflcient of anoe to skidding. A careful study to reduce the danger of skida; of the results obtained shows that Third, provide pavements free -to place a lamp at each end of
cause to complain about the taken that the surfaces were inshowed a co-officient of friction of ment and the bad stretch?
manner in which our tramcars no way cleaned or washed before .997. When this type of pave-friction is increased with a cor- the true slipperiness of a paved from irregularities and conвe- handled, but it should the test was started. All of the mant was wat to correspond to responding increase in resistance road depends not upon the type quently non-retentive of foreign and Fourth; the skid mediums; of road, but rather upon oul that soma sections of pavement tested wore the condition of dow, condensed to skidding. The following now meinbers be pointed
the Hongkong of the drivers are not at all care taken directly under the wheels fog or mist, the co-efficient of 4-The coofficients of friction various skid mediums which are provide for the propor cleansing havo joinod
All of the of these pavement surfaces af apt to be present. Automobile Association since we ful in pulling up their care correct of traffic from roads that had friction was 665; when wet dur- of all typos of pavements when
lyat the stopping places. Cars are been in service for several years. Ing the heavy rain condition, the clean are very similar. published the last list:--
The difference between these different types of pavements froquent intervals. allowed to approach a stopping | To determine the friction- bo-co-officient of friction wae .890. H. O. Odoll
Asphaltic Concrete (Topeka coefficients of friction is, howover, | #99CCHDITT place so quickly that when the tween an automobile tyre and a brako is applied the cars travel pavement,
was Type). This type for the condi-not vory grost in oný case, and it an apparatus pist the post and come to roat constructed by means of which ation as taken from the highway cannot safely be said that any right across the entrance of a section of pavement could be showed a co-efficient of friction of one type of pavement has greator side street. Yesterday a car held firmly in place in a level.789; after being subjected to the non-skid qualities under
A section of auto-cleansing action of water and woather conditions than a05 Motor cyclists will be pleased travelling westward, and stop position. to learn that, in response to re-ping on the corner of Ice House mobilo tyro hoavily weighted allowed to dry this typo showed a other typo.
The theco-efficient of friction of 970. across
most significant fact presentations made by the Hong Street and Des Voeux Road, was was then drawn kong Automobilo Association, it not pulled up until it had travers-pavement surface at a uniform When this type of pavoment was brought out by those results is has boon officially notified thatod the width of the Ice House. the reduction of the licence fee Siret opening, thus blocking all for motor-cycles with sidecars to cross traffic until it had sot $16, ta place of the proposed $24 down its passengers and passed por annum, has been recommend-on. Strict injunctions should bo ed to the Government,
given to tramcar drivers, as such an offence might easily load to a serious accident.
MTA. Weill
M. A. Razack
Eung Kui-yin
+ •
corner.
aro
· •
It is sincerely to be hoped that the new Traffic Regulations will
Motor cyclists will be interested be passed as early possible, as at the present time motorists hardly to learn that the first shipment of know whom they aro. Few ma-the popular "Matchless" motor toriste, if any, have a copy of the cycles has been recolved by the prosent Regulations, and the local Motor Dept. of tho Hongkong Automobile Association is. still Hotel. Both combination and waiting for the Regulations in solo models are included and will order to incorporate thom in the bo on show over the week-end.
BUREAU STILL WORKING.
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ALL THE WAY DOWN, Pross the foot button which In spite of reports to the con- trary, the Bureau of Standards of connects the starting motor all America will continue its ox- the way down-nover in a half- Insufflalont collent work in determining the hearted mannor. most valuable factors in relation pressure will not only damage the and brake contacts of the starting switch, brako linings officionoy. The next move will but sometimes injures the start- bo to take up the relations of frig motor. steering gears to balloon tyros and four-wheel brakes. To con-.
to
KEEP OFF CLUTCH.. Motoriste are advised to koop tinue this work acceptably bathoir feet from the clutch pedal yond a 10-months period it to while driving. Constant pressure necessary that additional funds tends to wear away the throw- ba: voted for this purpose by out bearing, making adjustments Congress
necessary.
tosted.
A FLIVVER OF CIVIL WAR DAYS.
Henry Ford has a now flyver of the vintage of 1860. He's just Rogers locomotive in Savannah. But he isn't going to use it on his railroa put in his musoum of railway antiques in Now York..
all
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O
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