The Daily Alaska empire., 1929-06-17
AIR MAPPING PLANES COME
 TO THIS CITY
Pliers Arrive from Peters
 burg Tender Gannett Is Due Tonight

To make their headquarters hero for the next few weeks, the four amphibian planes, under the com mand of Commander A. w. Rad ford, U. s. N., arrived in Gastineau Channel at $40 o'clock this morn ing from Petersburg which has been their base for the last three weeks while they completed the air map ping of that district, begun three years ago.
 The Gannet, 150 foot tender for the expedition, Lieut.. Thom S Macklin, Commanding Officer, is due to arrive tonight at 6:45 o'clock with the 120-foot barge which is equipped with a complete photo graphic laboratory, a motor over haul shop, dispensary, quarters for the aviation personnel, galley, mess room and office. It will tie up at the Government dock during the time the air-mapping expedi- IlOll DdotS at
 What Is To Be Done
 During the time they stay here, the air-mappers will photograph extensively in this vicinity, com pleting the photographing of Bar anof and Chichagof Islands, which was begun three years ago.
 The mapping of areas in Peters burg district has been completed according to R. H. Sargent, Topo- graphical Engineer of the Alaska Branch of the U. s. Geological Sur vey, who is in charge of the map ping for the U. S. Department of the Interior. In addition to the vertical photographs, used for map ping purposes, number of oblique photographs were taken, showing timber and water-power localities for the U. s. Forest Service.
 Oblioue photographs are taken with single lens camera which is held by the camera man over the side of the plane at an altitude which varies according to the amount of detail required, while mapping photographs are taken through a hole in the bottom of the plane, according to Lieut.. R. F Whitehead, pilot of plane no. in the expedition. When the plane takes off, the camera hatch is re- moved and the camera is mounted so as to take vertical photographs, he said. The altitude for map ping photographs is 1000 feet and successful photography requires per- fectly clear weather.
 The cameras used for mapping are T-2. four-lens cameras. Two planes are used for mapping pur- poses, one plane to stand by and the fourth plane is equipped with radio.
 fcrSOnncI on flaneS
 The personnel of the planes is: Plane number one, which has radio equipment, Commander Radford pilot; Hicks, chief radio mechanic; Cox, aviation chief mechanics mate.
 Plane number two: Lieut.. E. F. Burkett, pilot; MT. Sargent, and Johnson, aviation mechanics mate first class.
 Plane number three: Lieut.. R. F. Whitehead, pilot; Reneau, aviation mechanics mate first class, and Haase, chief photographer.
 Plane number four: Lieut.. c. F. Greber, pilot; Traitor, aviation me- chanic's mate first class, and Reed, aviation chief mechanics mate.
 On the Gannet are: Lieut.. Com mander H. B. Smith, of the Medi- cal Corps, U. s. N; Lieut.. E. F. Carr, Paymaster, and Lieut. L. P. Tawliaowski, aviator.
 The personnel of the Gannet is: Lieut.. Thomas Macklin, Command ing Officer; Click, Chief Boatswain; Dowd, boatswain nd machinist Hoey.
 The planes made the trip north from Petersburg in one hour and g minutes.
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