1932-04-06 — Page 6

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THE DIAL SWITCH IN OUR TELEPHONES.

MR. J. P. SHERRY'S ADDRESS AT THE ROTARY CLUB HOW AUTOMATIC CONNECTIONS ARE MADE.

HÓNG KONG'S REPRESENTATIVE AT THE INTERNATIONAL ROTARY CONVENTION,

As yesterday's meeting of the Rotary Club, Mr. J. P. Sherry gave an interesting account of the functions of the dial switch in automatic telephones. A full report of his address appears below.

It was announced during the meeting that Mr., T. B. Wilson will be representing the Hong Kung Rotary Club at the Internu- tional Rotary Convehtion in Beattle. The greeted with applause.

announcement WB

ANNUAL MEETING NEXT MONTH.

CORRESPONDENCE.

[All lettore, intended for publi sation, must be naoumpanied by the name and address of the writer, not for publication, unlear to denrad, but as evidence of good frith --ED..)

NUDISM.

TO THE EDITOR OF "THE" **RONG FONO: DAILY PIEAR."]

St-As an article has appeared Lin your to-day's issue" purporting to give the decision of the Govern. ment to the application of the Hong Kong Nudist Society, for an. ialand. in Hong Kong, waters, to, the effect, that no facilities whatsoever

The Chairman welcomed the fol- ledge of the operation of the dial will be afforded by the Govern lowing visiters-Rotarian Ben F. switch and its function in positionment. I shall thank you to kindly Thorpe, of Corina, California ing the various selector switches in give space to this our official state. U.S.A., Rotarian Dr. B. K. Wong, the automatic exchange during thement, that negative reply of any Shanghai, Rotarian W. Vinson Lee, establishment of a connection.

kind has been received by the Hong Shanghai. Mr. R. E. Farrell, Hong With this end in view, I have had Kong Nudist Socisty from the Kong, Mr., D. O de Silva, Hong a number of dial switches distribut Hong Kong Government, in reply Kong. Mr. W. J. Twiss and Mr. Ied amongst the various tables so to their applications for an island, Lankamp of Dutch East Indies, Mr. that my remarks will be more easily and that we have no indications. W. E. Williams, Hong Kong, Mr. J. I

whatsoever that · we shall not be J. Ferris of New York City and.

granted the lease of the island, Pay Lieut. J. S. S. Smith, 3.N.,

The article in your to-day's istuc is H.MLS. Devonshire.

therefore not supported by evidence. in our heads. Needless to hdd that we are confident of our complete success.

At the request of the Chairman, Mr. Thorpe mudo a brief addrem in which he conveyed the greetings of his Club in California and expreas ed his pleasure at being present at a Hong Kong meating.

followed,

The dial switel is perhaps the simplest of the many peces of equip. ment which go to the making of a complete automatic unit but, in ita present form, it represents the out- come af much research work

on the part of telephone, engineers to de- sign a dial which could be manu factured at a reasonpble cost, and, The Chairman panoqneed that, on at the same time, combine with this behalf of the Club b had accepted the qualities of accuracy and reliabi- an invitation for members to lunchlity in operation. Laboratory tests on board the President Hoover have demonstrated that the average next Tuesday. (Applause). The dial switch is capable of performing lunch, be added, would be free.upwards of 5,000,000 operations

Laughter and applause.)

Seattle Ocnvention.

without failure,

Defuition of Bystem.

Last week it was reported, to

The B.ESA. definition of an au mc, continued the Chairman, the tomate telephone system is Rotarian T. Wilson is going on system in which the calling party furlough earlier than firat expected is enabled without the aid of an and that he will be available to re-operator to complete a call through prosent us at the International switches "remotely controlled," Rotary Convention in Seattle. I felt sure that I should be anticipat ing your wishes in designating him quit, delegate and would ask you to confrm that action by show of Hunde,

"It has been brought to my at. tention that Article 4 of the Club Bye-lawe provides that the annual meeting of this Club shall be held. during the first work in May, End Article T requires that at the re gular meeting one month prior to the annual meeting the presiding officer shall ask for nominations by members of the Club with a view to Sling the various offices. suggest, however, that it will be moro satisfactory to appoint a Nominating Committee in order that we may put before you the nemos of members who are actually willing to take office. I would in- vite a motion that a Nominating Committee be appointed.

་་

Thanking you, 1 am, Yours etc.,

HERBERT E. LANEPART, President,

Hong Kong Nudist Society. Hong Kong, April 5, 1932.

Mr. Lanepart can rest assured that if the Government has not yet formally turned down his applika before it takes that step. There is tion it is only matter of time

"not a hope" for his movement, inthia Colony-Editor, H.K. Daily) Press

in order to ensure that the switches in the exchange will be ready to receive the impulses transmitted.

The relationship between tho It follows, therefore, that means make and break periods of an im must be provided on the telephone pulse--that is to say, the periods instruments to effect this remote during which the impulse contacts control and it will be apparent are closed and opened is import- that the correct functioning of the ant because the magnet responsible automatic system is directly de- for operating the mechanical shaft Pendent on the dial switch which on the switch in the exchange re- transmits the impulses to the exceives current during the break change equipment.

portion of an impulse whereas an The main parts of the dial which other piece of the electro magnetic. can be seen on inspection consist of equipment receives current during the finger plate which winds up the make period. clock spring on being pulled round; If the break partion is shorten- the number plate; the "impulseed, the current will be prevented wheel; the governor which controls from rising to its full value and, if the speed of the dial, and two sets the make period is unduly shorten. of spring contacts. The smaller seted, the piece of apparatus which de- consists of the impulse springs and pends on the current transmitted the burger is required for ensuring during this period for its continued the correct electrical association of operation will release. In either the impulsing contacts with the recase, the connection would not be mainder of the telephone circuit so satisfactorily established.

eliminate objectionable

1.44

08 to

clicks in the receiver during

Standard Ration of Break.

dialling, and to arrange the ayail. The effects of the condition of the On the proposal of Mr. P. S. able apparatus in the telephone dir-line connecting the telephone with Cassidy, seconded by Mr. W. Huit so that the best impulse form the exchange plao result in distor Ball, it was agreed that the is transmitted.

In effect, the re-tion of the impulse form and, in Nominating Committee should conceiver and transmitter are short order to allow for reasonable varia sist of the President, Treasurer, circuited and a condenser-which is tions in the mike and break periods, Sceretaries and Rotarian Me

ted in the telephone for another a standard ratio of break to make Pherson.

ppose is temporarily connected for impulses bae been laid down. The Chalmann said: "It only recres the impulse contacts to pre-This specifies that an impulse shall mains for me to remind you that bevent the induced voltage reaching a have a break to make ratio of 68.6% fore the next meeting our esteemed sufficiently high figure to break to 23:3% of the impulse period, the friend and director Mr. B. Wylie

will have left us for Lánkumdaddie. down the insulation. When the normal speed of delivery of im- I am sure all members of the Club front sircular plate with the 10 pulses being specified as 10 per will join with me in wishing Kruger-holes is rotated in a clock. Wylie's very pleasant foare. Terwise direction until the finger-stop second, Thus, at standard speed, a pect before long to bear that he has sched, it winds up a clock single impulse occupies 1/10th of a founded a Rotary Club in his native spring so that when the fuger is second of which 9/3rds is perapied place, which. I will not aga plate returns to its normal position by the break and 1/3rd by the ex- withdrawn from the finger hole, the (Laughter.) Anyway whatever he does, we under the control of the speed change switches even under adverse thank him on behalf of the Club governor. During the return of the line conditions. for all he has done for us and we Plate, the impulss springs open and the decimal value of the digit diall cioas a number of times equal to

tempt to pronounes.

ما

has been placed after a figure It will be noticed that the cyphor

wish him a very pleasant, and happy leave and a speedy return to us with renewed, health and vigour, so that if, say, the digit """ on the number plate because, (Appinuse)

MI SHERRY'S ADDRESS.

is dialled 6 impulses are trans- mitted

when the figure "O" is diallock, ten impulses are transmitted. This The Mechanism.

is to enable uniformity to he oli Mr. J. P. Sherry's speech was 68 Looking at the back of the dial served between the number of im-] "follows:-" There are innumerable you will observe & alipping cam, pulser sent and the number of zubjects under the main heading of with a long projecting pics, which steps taken by the apparatus which telephony on which one could speak in hold in intimate contact with the 1

but the difficulty in in choosing one impulse wheel the latter being the they control, thus tending to sim- which will permit of non-technical toothed wheel underneath-undplication.

(treatment and, at the same time, moves with it on rotation of the I will now describe briefly what,

retain it intereste rundfinger plate until it encounters the

Onlifting the telephone receivor and before dielling commandes, an slentro-manguet, termed a "relay

In Galecting the dial switch, for forked top. When the finger plate happens during the setting up of [my talk today, I had in mind that is relcsend", the cam returns with a call..

it is perhaps tho only part of the the impulse wheel and, until it re automatic equipment with which | sumes its normal position, it screens the average tel phone user comes the tenth of the wheel so that until into contact, and it occurred to me this position is reached no impulses that, as all" Rotarians here are un can be, transmitted. This delays in operated" which, in turn, actuates doubtedly telephone more, it might 1 the frenmission of impulses for a self-driving switch individual to be both interesting and useful if I period approximately equal to that each telephone number. "This awitch cozidisconvey to them some know- of two impulses, mail-in recessary (Continued on. Haga 11)

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