1923-09-22 — Page 9

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THE HONGKONG TELEGRAPH.

WIRELESS. NOTES AND NEWS.

Details of Radio Typewriter.

In many telegraph offices theer will be found an instrument called the Mokrun talotypo. This in- strunient which at first glance may easily be mistaken for an ordinary typewriter is for au tomatically transmitting and receiving messages over the telegraph line, and has been in, use for a number of years, says Mr. G.IL. Daly writing in Popular Wireless Weekly.

The Morkrum teletypo has a keyboard containing the letters of the alphabet, numerals, and pune- tuition marks exactly similar, to the standard typewriter keyboard, and in order to send a massare to a distant station by means of this machins it is merely necess- ary for the operator to strike the various letters "on the keyboard., justas if he wore typing a" letter In this case, however, the fact the operátor striking the key Causes the message to be automa tically printed on a moving of paper at the distant receiving station within an extremely short space of time.

SATURDAY, SEPTEMBER 22, 1923,

BASEBALL POINTS.

م

Intep elation of "Ruls; The umpire is never supposed typwriter is a typo wheel conto interfere with a play.

There are times, despite eveny taing letters, numerals, and

MATKA, exactly effort to get out of the way that punctuation similar to the keyboard of the the umpire butts in.

Ta minor leazus game these transmitting radio typewriter.

On the receipt of a certain twn plays came an, the umpire combination of impulsos. by ouch time beint the central figure. There is a runner on first Ho the receiving antenna this type

to rotate by starts to steal second. The un- wheel is "made means of a delicato and selective pire working back of the catcher. mechanism-and print the letter is standing close. As the catch- which that particular combinationer starts to throw, his arm comes of impulses represents, upon into contact with the umpire's The throw is bad and moving slip of paper. Therefore protector. the latter which was depressed on the runner goes to third.

A few innings later, with a the keyboard at the transmiting station is automatically printed runner on fit, the batsman upon this moving slip of paper singles to right field. The run- nor on first elects to try for third," at the receiving station.

is

As it was impossible to operate The throw to that hase hits the the teletype with the internation-base umpire and the hall

l Morse code the inventors delected into the outfield. The hund it necessary to evolve a runner on first scores, while the code of their own. In this code batsman reaches third.

What was the proper ruling in such letter of the alphabet is ellotted five units or impulses, each play? the difference between each let-1 ter, etc.,, being that the five units] are differently arranged in each

"Cas0.

The Interpretation. The two plays are interpreted differently.

In the first play in which the ampire interfere with tha catcher, who was makinta taraw,

hase,

theball

For instance, the five units allotted to the letter "A" may be said to consist of two dots and three spaces, as it were.. The second lotter B consists of ons dot, immediately becomes dead and nɔ two spaces, and two dots. "C" is made up of on: space and three per who went to third should dots, followed by a space--and have been seat back to first. so on with each letter of the alphabet.

"

baso can be un.

The run-

It was only natural that sooner or later the idea would appeal to someone of using this ingenious teletye for wireless work, and this someone appears to have been a Mr. JH. Brady. The perfected radio typewriter, how over, which embodies the Mork rumi teletype, is the work of the U.S. Navy Department and the

One obvious advantage of this Murkrum Company of Chicaso, and with this ralio typewriter code is from the point of view of it is possible for any secrecy, for the actual arrange

wireless ment of the cole can be altered typist to message in the same way as it will. he or she would type a letter-

TESTING THE STRAIN. i.c., by depressing the necessary

The Intest scientific instrumenti letter kays. At. the receiving station the message is automati. W. H. Derriman Aerials. For to be introducat in America is a cally printed on to a moving slip directional transmission

send

B.

A

Recent Inventions"

J. Robinson. H. L. Crowther. &!

only

In the other play where the field, umpire was hit by a throw from the outfield, the hall is con- sidered in play and the manner on first who scored and the batsman why reached third were so entitl- ed to advance.

ar

1.

raure by means of which the of paper by means of another vertical portions of the antennae strains pradural in concrete roats by trafic natsing over their sur- raido typewriter. For it should, are used, the idea" being that be understood. that

Ono test each in-radiations from horizontal por face can he measured. dividual radio typewriter consists tions produce errors dus to ro-revealed the fact that a 5-ton of a complete transmitting and flection in the upper atmosphere. track stressad the wond surface un receiving apparatus in itself. A Two aerials having horizontal

to nearly half of its breaking strength. very important point about this and vertical portions may be machine is that it entails no employed, the horizontal portions knowledge of the Morse," or any lying paralled and close together, other code, un the part of the land thus mutually neutralising, radio typist.

"

"

and the vertical portions being at least one must be very thin. In When a particular, key of theplaced as far as possible apart, os form, a tain bronze band keyboard is depressed, such as, the serial then being practically presses a mica shost against

vulcanito drum baif sheathed in for instance, the letter "A," the H-shaped. controlling circuit of the wireless A. W. Knight.-Inductances.-brass, the capacity being varied transmitter-to which the radio Three flat circular coils are by rotating the drum which may typewriter isconnected- is closed mounted upon ebonile stands, be parafin lubricated.

British Thomsonhouston Ltd.-- and a series of electrical impulses the centre one of which is fixed. are radiated into the ether. This the other ones being attached to Valves.--The electrodes for low- is accomplished by the mechani- ja rod passing through the fixed canacity amplifying valves are cul action of certain cams and stand and to a concentric sleeve arranged in aspacial manner, and The stands are are then seiled into the bulb so leavers working in conjunction respectively. with an electric motor and select-adjusted by means of knobs upon that the anode 13ading-in wire ing device which are brought into the ends of the rod and the sleeve, enters at the opposite end to the action by the depression of the and are prossed together by a grid lead-in. The valve is ultim key, the whole being contained in spring which pressed together by ately, clipped into supports which a compact cabinet behind the a sprint which presses the sleeve engage the leading-in wires. keyboard.

and rod in opposite directions... Marconi's. Wireless Telezraph Now each letter köy on the Capitol. Phanolier Corp Co., Ltd.-Valve Genrators.

oscillations keyboard is allotted a different Receivers.-A receiving set is Short combination of electrical im-incorporated in an omamental gen rated by a

wave

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being depresed causes the wire- an inverted loud-speaker horn wiras leading to the grid uni Jess transmitter to radiate one ant capacity earth, and is fitted filament, the grid leat being con- particular combination of im- with a delector. Umbrella and nected to, the H.T. positive and pulses into space,

loop aerials are formed in the top being separated from the filament in Bathing Caps-and are offering same at very moderate prices. These impulses on being picked and sides of the shade which is lead by a condenser. A negative up by the aerial at the receivin-hinzed for; adjustment, and a charged metal cylinder may sur- station are amplified by a two-fringe conceals the valves, etc., round the valve if only two'

11. Queen's Road, Central. stare amplifier, and in this con-placed at the centre, and also the electrodes are used, and the dition actuate an automatic relay lamps which are supported in wave-length generated is adjusted

by altering the length of the Tel. Central No. 1877. recorder, which in turn operates reflectors around the sides. the printing portion of the radio. Dr. G. Soibt.-Condensers.-A parallel leads,

W. Dubilier.-Condensers.- typewriter of the receiving variable condenser is formed from station.

metal coatings separated by very The plates are secured together The principal unit of the thin sheet mica. The metal coat- by two or more tuhes passing receiving portion of the radio ings are relatively movable, and through the stack and "riveted

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Tel. Central 236

:

over at their ends. Terminal THE HUMAN ZOO members may be placed over the the end before rivetin", and the end plates may be of fibre, etc., in which case the condenser may! constitute a grid leak if a pencil) line be drawn across the plates !from one terminal to the other. A ¡number of condensers may be clamped torether by bolts passed throu-h the tubes.

Marconi's wireless teletraph Co., Ltd.,-Broadcasting-In or der to render broadcast signals unintelligible to unauthorised re-. ceivers, the carrier wave, in addi- tion to havingz the desired signals, is modulated by confusing tones and signals such as tones outside the speech range, music, or combinations of tones, which may be change'l from time to Linie. The interferonces are eliminated for authorised receiv ors by supplyin filter circuits, etc.. the coils of which may be set! in cement to prevent duplication. AJR Streadwick.-Gramo- phones.For controllin: the sound of a gramophone, etc., an aperturad diaphragm is provided | in the sound passage and carrice puides in. which slides an aper turad shutter whereby the volumis of sound emitted may be adjusted. J. Timms. Battories. Wood pulp boards used as separators in storage batteries are protected from the action of acid by impro- gnating with paraffin wax

EVOLUTION

Tel, Central No. 1877,

Copyright 1833 by

Fablis Ledger Of