1925-06-06 — Page 12

HONGKONG TELEGRAPH SATURDAY,

HOME LEAVE

If you are going on Home Leave next year register for accommodations now in order to secure the best space. Bookings made on all Steamship Lines tariff rates. Through tickets to Europe via United States and Canada, 1 omplete Information given as to Railways, " Eotels, sight-seeing, etc., en route.

Baggage and Accident Jasurance,

Shipments of all kinds handled to all parts of the World, Carry American Express Trävellers Chequës.

For complete information apply "THE AMERICAN EXPRESS CO., Inc. 4A, Des Voeux Road, Contral. Telephone C. 4625.

DUBARRY'S HIGH

CLASS PRODUCTS

Characterised by Daintiness and Charm, Bath Crystals, Soaps, Perfumes, Poudre, etc., etc. The Hall-mark of Quality. New Stocks constant- ly arriving.

THE COLONIAL DISPENSARY.

Telephone C. 1877.

14, Queen's Road, Central.

JUNE 6, 1925. (FEATURE SECTION.

Radio Notes & News.

How To Build A Short Wave Receiver.

(By David Dietz for the Hongkong Telegraph.)

This is the short wave receivor One grid leak and condenser with which you may be able to one to two megohms and 00025 keep in touch with the Maċ- mid. Millan Arotio expedition this

Bummor..

It is the sot Commander Donald B. McMillan will tako with him on the Bowdoin this June.

One shoke call.

Twolvs binding posts. One single-circuit phone jack.. Asst of baskot-weave tuning

It can be built at a small outlay coils. and with an evening's work

in both the hook-up and tho diagram of the panol lay out in- dicating the way in which the coils are connected.

The sot should be grounded in tho usual way, proferably to a water-pipo.ro

Either an outdoor or indoor [aerial consisting of a single wirs hung vertically and not horizon- tally should be used.

Total length of aerial and wiro should nr exceed 35 feet. It may be as short as eight feet.

If desired, a two-stage audio- frequency amplifier can be con- nocted to this set in the usual manner.

BIRDS' LOVE OF COLOUR. Some correspondence has been printed in the Times on the sub- Ject of birds' love of colour... The

The two variable condenserS The coming Arolio expedition are mounted across the centrer of is going to be perhaps the most the panel with the rheostat important trial short wave between them. broadcasting has ever undorgons. Eight binding posts are mount-Hospital, Horsham (the home of

For this

purpose, John Led across the top of the panel. Reinartz, famous radio amateur The phone jack is in the lower and inventor of the Reinartz [ leʻt-band corner. circuit on which construction of The tubo socket, grid-leak and

curious fact was mentioned that for five miles round Christ's

birds' nests are lined with the the Bluecoat Boys from London),

fluff and scraps of wool of the boys' yellow stockings.

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15, Queen's Road, Contral

Telephone C. 75

One of the most treasured possessions of friends far away is a photo of their dear ones overseas. The Ming Yuen Studio is fitted with the most modern photographic "equipment and will be pleased to show you specimens of

their work.

THE MING YUEN STUDIO

(Battery Path.)

Official Photographers to the "H. K. Telegraph."

TO WORK IN COMFORT DURING THE DAY. AND REST IN COMFORT DURING THE NIGHT.

USE

KETOCIDE

and quickly rid the Offico and Homo. of all

MOSQUITOES. FLIES. SANDFLIES, Etc., Etc.

SKETOCIDE kills all insects.

SKETOCIDE is pleasant in uas

SKETOCIDE is nonstaining

THE

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Building, 26 Queen's Road Central. Tel. 345.

The 20, 40, 80-meter Reinartz receiver, giving hook-up, at left, and panel details at right, upper views. Lower photo shows John L. Reinartz, left, Divid "Dietz, and E, F. McDonald, right, consulting on the details of the low wave tests.

this recoiver is based, will accom-condenser, and choke coil are pany the expedition. With mounted on the back of the panel. Reinartz and MacMillan, will go The remaining four binding Lieutenant Commander E. F. posta, which serve as "A" and McDonald, president of the Zenith "B" battery connections are also Radio Corporation.

mounted on the back of the panël.

It was Reinartz who, during, the lust eclipse, discovered that short waves travelled farther by day than they did by night and that they exceeded the best ac complishments

All apparatus ehould be crowd- od togther with as short leads as possible."

Five-plate condensers can be obtained by removing plates from

variable of long waves sta dard

condensers under the best conditions. The until only five remain. Mao Milian expedition will try to SHORT LEADS IMPORTANT: verify this discovery with further Either a UV201-Ajor a UV199 tests.

tube can be used.

. The UV201-A tubo requires Aix- obm rheostat 'and' a six-volt storage "A" battery.

Uso a 45-volt "B" battery in in either case.

WINDING THE COILS.

ACROSS THE GLOBE.. McDonald has arranged for tests with Lieutenant Frederick Schnell of the American Radio Relay League who is on a special short wave testing, mission on the U. S. S. Sonttia destined for The choke coil is made by. Tasmania. Thore, with a rewinding a layer of No. 30 DCO ceiver similar to that of Reinartz, wire for 100 turns ou

an in-" he will try to listen in for signale sulated tube one inch in diameter from the Arctic, 11,000 miles and a little more then three

inches long.

Away,

Ід between, broadcasting Tive basket-weave tuning coils station WJAZ, the Zenith station will be needed. They are ali at Chicago, will be on guard for wound of No. 19 DCO wire. such signals on 20, 40 and 80

For 20-meter work, the antenna meters wavelength and will coll should consist of five turns. relay them over the country. It The tuning coil of nine turns, will sund news, messages. and tapped at three and elx turas. concerts on the low wavelength For 40-motor work, the same for the benefit of the Arctic ex-antoana coil can be used. But &. plorare.

tuning coll consisting of 18 turas, tapped at six and twolve turns is hooded.

on

those

.M

low

Most signals from the Mas Millan will be sunt in codo. But attempts will be made to broad-

For 80-meter work, an antenna oast apooch

coll should consist of ton turos, wavelengths,

and the tuning coil of 36 turns, CONSTRUCTION DETAILS. tapped at 12 and 24 turns, To enable you to build this ro: These coils are wound f

and coivor, I have had Reinartz out of claven poge in a three-inch himself explain: its construction oirole. Tio the completed form in dotail.

with throad. T The following material is negd- od:

One panel, twelve inches by seven inches,

Two 'five-plate condensore. One tuba and sookat. Ono rheostat

OPERATION OF BET.

In using the, cat, conubot the coils for the necessary wavelength to the binding posts upon the front of the sot in the way shown in the diagram.

Corresponding lottors are used,

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