1924-03-12 — Page 9

THE HONGKONG TELEGRAPH.

FACTS THAT SPEAK FOR THEMSELVES

WEDNESDAY, MARCH

RADIO NOTES AND NEWS.

OFFICIAL POLICE

Four wheel 10 m.ph. 92

ON DRY ROARS

BUICK PERFORMANCE

ON WET ROADS

10 m.ph took 3'11"

1924

Four wheel

BUICK PERFORMANCE

1924

BRAKING LIMITS (Test always cat- ried out éry reads)

15 mph. 20′ 8′′

++

brakes

20 mph. 27

10' 2' 16' 814

15 m.p.h.

11' 9'

"

20 m.p.h.

20' 8'

25 m.p.b. 38'

25 m.ph.

27' 16'

25 mph.

29' 9'

brakes

14

30 mph. 83′ 3′′

30 m.p.b.....

3389

30 m.ph.

¥29.

BUICKS

35 m.ph. 113'

35 m.p.h.

21

35 m.p.b. 41'36

59' 1

10 m.p.h. took 2

15 m.ph.

20 m.p.b.

(Speedometers were tested before and after the test and were found to be registered correctly.)

THE HONGKONG & KOWLOON TAXI-CAB

BUICKS

CO., LTD.

Antennae Stuck in the Ground.

-to

Dig hole in your back yard and place your radio “serial "in it, if you would be up to date!

.

The actual colour of a mineral is one of the characteristic properties of the material, and in That is, of course, granting is possessed by a mineral is also a smaller way, the lustre which that Dr. James Harris Rogers, the American inventor, characteristic of the substance, has proved bis theory. Some writes J. F. Corrigan in Popular Wireless. The difference between time ago be started, experiment.

mineral ing with underground antenna mineral colour and To-day Dr. Rogers, resuming his lustre, however, les in the fact work after a short illness, freely that the latter characteristic is predicts that underground tran-only a property which is posse55- smission will supersede aerial | ed by the mineral when it exists in the mass or lump form, transmission.

whereas its true colour stil Dr. Rogers-reveals that perfect persists, no matter how finely it communication was carried on his powdered. with points 200 miles away. dur-

ing experiments be conducted. The lustre of minerals is due to Interference. he declares, is the peculiar nature of their sur practically eliminated, difficulties faces, and it depends upon the of day reception are reduced to a way in which they absorb or minimum and the power required reflect the light which falls upon for transmission is considerably them. If, for instance, a mineral- less than for aerial antennae. reflects back most of the light One of Dr. Rogers' underground which falls upon its surface, it is sets consists of a loop antenna said to possess a high degree of let down into a metal-lined and lustre. If, however, most of the metal-covered well. He has practi- incident light is absorbed by the cally abandoned his high strung crystal or mineral, its lustre is aerial on the roof of his laboratory, referred to as being dull. nightly hearing foreign stations on his submerged set.

of all metala.

The lustre of minerals is usual- ly divided into two classes, viz., metallic and non-metallic. EASIER BROADCASTING?

Minerals which exhibit metallic Dr. Rogers believes underlustres have as the name implies, ground transmission to be an the peculiar/sbine which is so important development in radio characteristic science, and predicts it will make Galena, which under the guise of possible the concentration of some proprietary "ite" or other broadcasting at a group of power-glistens in the cystal receiving] ful stations.

sets, possess a metallic lustre to These stations." he believes, a high degree. "will be located at strategic points over the country. Reception will

Non-metallic lustres of miner-

be clear and strong in every wet, als are more complex to classify, interference from so many differ- and they can be divided up into different kinds A ent wavelengths being eliminated. | several The stations will operate some-diamond possess an adamantine thing like a telephone switch lustre because it has such a vary board, tuning in for the program- high power of scattering the rays mes they desire to rebroadcast in of light which fall on its surface, their vicinity.

Many of the heavier minerals

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A USEFUL TABLE

"Copyright. Harria & Ewing

Dr. James H. Rogers testing his underground antenná.

"Communication with trans-1 also possess this property_to Atlantic and trans-Pacific points some extent, and thus we find will be among the usual things. that the lustre of the rectifying But all of this will come only mineral, zincite, is described as through under-ground and sub- | being of a sub-adamantine pature. marine transmission," Dr. Rogers says.

While Dr. Rogers thus would

TYPES OF LUSTRE.

Vitreous lustre-i.s. the lustre

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of glass, need not be described at THE HUMAN ZOO

AERIAL PROBLEMS.

eliminate the weaknesses of radio

any length. Some of the common The accompanying table, shew-communication, ether inventore varieties of minerals exhibit this ing the lustre of various rectify are continning their attempts to type of lustre, quartz and calcite ing minerale used in wireless, perfect serial transmission. being especially good examples of may be useful to the amateur to One of the tasks before the the type. judge the kind of crystal be. Radio Division, Bureau of Stand-

Other sub-divisions of the possesses:

ards, is to eliminate "fading" Bornite

Sab-metallic and to derise means to con- nonmetallic lustre of rainerals and crystals are rexiuous Carborundum Adamantine.

fine broadcasting ́to its part- Copper Pyrites | Submetallic icular wave-length. Once this is greasy, pearly, silky, etc. These Corundum

done the aerial should enjoy as terms are, however, self-explana- Galena

clear and strong reception as Dr.tory, and therefore need not be Graphite

Rogers claims for the under-farther discussed. The peculiar Iron Pyrites

ground apparatus.

silky appearance of some mineral

Malachite"

substances is the result of their fibrous structure, and many kinds of asbestos exhibit this type of

Molybdenite Silicon Tellurium Zincite

Vitreous

Metallic

Dull-metallic Sub-metallic Vitreous-ada-"

mantine Sub-metallic Metallic

Metallic Adamantine

HOW PLEASANT!

lustre.

Radio fans will remember that Dr Rogers' first experiment with underground antennae played an important part during the war, when many enemy communica- The lustre of most of the differ- tions were heard on underground ent varieties of minerals which are wireless network.

LUSTRE OF CRYSTALS.

used for radio reception is usually of a metallic nature. Some of In wireless circles one some-them, however, exhibit other las- times hears some specimens of tres which will be seen from a Golfing in the Fiji Islands is crystals being referred to as glance at the accompanying table. ideal, according to Englishmen possessing metallic lustres, whilst The study of mineral lustre is of who have been there, for the others. may be said to have some importance, becausé by its reason that is almost impossible vitreous lustres,, and, so. on means many genuine minerals to lose a ball. Like most of the according to the particular nature may be distinguished from isked rest of the landscape, the golf of the surface which the crystal compositions without the neces links are largely covered with a possesses. The lustre of a crystal sity of having recourse sensitive plant which shrivels ata is a property which is entirely chemical analysis. It is often touch.-Having patted, sliced or distinct from its colour. It is very easy to imitate the colours topped his ball, the player merely really a term used to denote the of minerals, but to artificially has to follow it along the line of particular shine and appearance impart the peculiar lustre which ahrivelled plants to. Its resting which is exhibited by the mineral characterises the frue mineral is place.

or crystal.

very difficult-

to

Copyright, SHO Zubile Lodg

A LITTLE GIRL WHO KEPT ON PLAYING,