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The following classifications, which include most landmarks, are defined and ac- 

 companied by remarks to standardize their use. They shall be so used so far as 

 practicable. 



BUILDING.— (See House.) 



CHIMNEY. — That projecting part of a building for conveying smoke, etc., to the outer air. 

 This term is to be used only where the building is the prominent feature and the charting of some 

 specific part of it is desirable; for example, the chimney of a large factory. 



CUPOLA. — A small turret or dome-shaped tower rising from a building, in cases where the 

 building is the prominent object and where the cupola is small as compared to the building. 



DOME.- — A large cupola of rounded hemispherical form, or a roof of the same shape, whether 

 it is actually rounded or many-sided. 



FLAGPOLE. — A single staff flagpole rising from the ground and not attached to a building. 



FLAGSTAFF. — A single staff flagpole rising from a building. This is not desirable as a land- 

 mark, due to its nonpermanence. Although it is desirable that the most definite part of a building 

 (such as the flagstaff) be pointed at in making observations, this is not necessarily the most impor- 

 tant part for charting purposes. Wherever possible give, for use on the chart, that part of the build- 

 ing from which the flagstaff rises, as TOWER, CUPOLA, DOME, etc. 



FLAG TOWER. — Any scaffold-like tower on which flags are hoisted, such as a Coast Guard 

 skeleton steel flagpole or a Weather Bureau signal tower. Do not use Signal Tower. 



GAS TANK or OIL TANK.^Since these differ in shape and size from a water tank, the com- 

 pound name will be used. 



HOUSE or BUILDING.— Although it is desirable to locate a house or building by observations 

 on a specific point, as the west gable or the flagstaff, such terms are not desirable for charting pur- 

 poses, where it is the structure itself which is the landmark. Use HOUSE or BUILDING followed 

 by a description of the point in either capitals or lower-case letters, according to whether it should be 

 used on the chart or not. Where the outline of the buflding should be shown on the chart, the following 

 notation — -"chart outlme" — should be made on Form 567. 



LOOKOUT TOWER — Any tower surmounted by a small house in which a watch is habitually 

 kept, such as a Coast Guard lookout tower or a fire lookout tower. Do not use this term in describing 

 an observation tower, or a part of a building in which no watch is kept. 



MONUMENT. — Do not use Obelisk or other terms. 



OIL TANK.— (See Gas Tank.) 



RADIO MAST. — A general term to include any tower, pole, or structure for elevating antennas. 



SPIRE. — In general, any slender pointed structure surmounting a building. The spire is rarely 

 less than two-thirds of the entire height and its lines are rarely broken by stages or other features. 

 Do not use Steeple. Spire is not applicable to a short pyramid-shaped structure rising from a tower 

 or belfry. 



STACK — Any tall smokestack or chimney, regardless of color, shape, or material, if the stack 

 is more prominent, as a landmark, than any buildings in connection with it. Do not use Chimney. 



STAND PIPE. — A tall cylindrical structure, in a waterworks system, whose height is several 

 times greater than its diameter. 



TANK. — A tank for holding water, when its base rests on the ground or other foundation, and 

 its height is not much greater than its diameter. 



TANK (ELEVATED). — A tank for holding water, where such tank is elevated high above the 

 ground or other foundation by a tall skeleton framework. 



TOWER. — (a) A part of a structure higher than the rest, but having vertical sides for the greater 

 part of its height. 



(b) An isolated structure with vertical sides (not otherwise classified), high in proportion to 

 the size of its base, and of simple form. 



(c) The top of a skyscraper, high in proportion to its horizontal size and rising above its 

 surroundings. 



(d) Any structure, whether its sides are vertical or not, with base on the ground and high in 

 proportion to its base. Its sides may be open framework, such as a Bilby steel tower. 



TREE. — Do not use Lone tree or Conspicuous lone tree. This is assumed, otherwise the tree 

 would not serve as a landmark. 



