The Alaska daily empire., 1920-09-01
NAVY TO ERECT PHOTOGRAPHERS 0C
 SETS IN NORTH
Department Plans Establish
 ment of Six Stations as < Aid to Navigation.
COLD BAY TO GET RADIO
War Invention. Adapted to
 Uses of Peace, WEI Be h. stalled Tn New Stations.

 of a number of compass radio sta : tions along the Alaskan coast. and ftbc erection of a radio telegraph sta tion tt Cold Bay, accordpg to F. E i Dunklee, radio engineer who arrived in Juneau yesterday. MT Dunklee is to get certain data for use in con | uccton with the establishment of the trropoeed stations daring his stay here.
 i Il will he Impossible to get mater 1 ial on the ground and do the work i this summer, according to MT. Dunk { Ice. who is inclined to believe that [ it will be next season before any i of the stations are erected How ! ever, ho stated. this is q matter foi Lieut.. Commander Luchel, District 1 Superintendent of Communication, to settle. The latter recently passed through Juneau enrOute to the West ward and will make a tour of the district, visiting the proposed sites in Southeastern Alaska points be fore returning to his headquarters iG Bremerton
 Locations Given
 The navys present plans call fol i the establishment of compass radio stations at Scotch Cap Light, at Uni mak; at the entrance to Cooks Inlet Cape Hinchinbrook; Cape St. Elias l Cape Spencer; the northeast poin: of Cape Afognak and one in South eastern Alaska south of Cape Spen cer, Tentative suggestions have i mentioned Cape Omanney, Cape Mu. 1on, and Cape Shakan as being de sirable. No definite locations, how ever, have been determined upon
 While no stated powered set has been announced for Cold Bay it will be of medium power and of sufficient ! capacity to communicate with other naval stations in Western and Cen tral Alaska. The compass stations will be equipped with the regular radio outfit of small size but strong enough to work with nearby stations ! and ships in range of approximately 90 miles.
 OutgroWth of the War "One of the most interesting devel opments of the radio art" says MT Dlnklee, brought out by the war was the radio direction finder, ol radio compass, as it is usually called. When the zeppelins were making their frequent raids over England, the keen necessity of know ing the whereabouts of these raid CTS was immediately felt, and the efforts of England's foremost scient- ists were directed toward the solu- tion of the problem.
 "The Zeppelins always reported their departure to their bases, and frequently used their radio sets while enroute to England. With this as a basis a radio direction finder was developed, which in it's essential parts consists of rectangular box like coil mounted on a shaft so as to rotate in horizontal plane throughout 360 degrees. The firsf direction finders were rather crude but offered means of locating the Ieppelins somewhere within cir cle of ten miles or so in diameter which accounts for the cessation Of these raids to great extent.
 Adapted For Commerce
 The direction finder has now been adapted for the needs of commerce and through it's agencies, vessels plying the seas are enabled to find their exact positions. To ascertain their exact positions, two or more stations are required, located from D to 90 miles apart. One station alone. can only indicate the direction ot vessel. that is. it can only des cribe single straight line, some where along which the vessel is To c3ted. Another station at a distance gives similar line. and at the point of intersection of the two lines. the vessel will he located.
 Unfortunately. the wireless waves which are utilized to ascertain the direction of a vessel. are obedient to the laws of reflection. refraction "h" apSol P'lou, Whlch curtdiiS the usefulness of the stations to con siderable extent Therefore. accur- ate results are obtained only when the wireless waves. are travelling in a straight line from their source.
 "lrregularitios in coast line. inter. vening islands or rocks. hills. trees and mineral deposits all exert a bending influence upon the waves some Of which effects may bc com pensated for as with a magnetic com pass on board ship: but in general. accurate results from station may be expected only when there is a straight stretch of water between the ship whose direction is desired. and the station itself A single com pass station might, therefore. be lik- ened to a lighthouse. which is visible my distance, and through fog, snow or any atmospheric conditions. 1ut which cannot be seen around a 'orner' any more than a lighthouse .ould be Seen.
 Will Increase Stations
 Thus, the establishment of such chain of stations which is now nro-