The National Geographic Magazine, Volume 50National Geographic Society, 1927 - Geography Indexes kept up to date with supplements. |
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... pole borer ( Parandra brunnea ) : Male and female beetles . Fig . 2. - The chestnut telephone - pole borer : Young larvæ , dorsal and lateral views . Fig . 3. - Damage to an untreated chestnut telegraph pole near surface of ground by ...
... pole borer ( Parandra brunnea ) : Male and female beetles . Fig . 2. - The chestnut telephone - pole borer : Young larvæ , dorsal and lateral views . Fig . 3. - Damage to an untreated chestnut telegraph pole near surface of ground by ...
Page 8
... pole indicated creosote retentions of 3.5 , 5.8 , and 2.5 pounds per cubic foot ( 56 , 93 , and 40 kg / m3 ) . All five poles were light brown . One pole had abundant , short , cross - grained breaks in the wood on the exterior surface ...
... pole indicated creosote retentions of 3.5 , 5.8 , and 2.5 pounds per cubic foot ( 56 , 93 , and 40 kg / m3 ) . All five poles were light brown . One pole had abundant , short , cross - grained breaks in the wood on the exterior surface ...
Page 9
... poles . During the loading of the poles , particularly in the earlier tests , the poles moved at the groundline . An approximation of the amount of movement of the pole in the ground may be noted in table 3 and figure 7 by comparing the ...
... poles . During the loading of the poles , particularly in the earlier tests , the poles moved at the groundline . An approximation of the amount of movement of the pole in the ground may be noted in table 3 and figure 7 by comparing the ...
Page 5
... pole to be treated . A lead pipe runs from the elevated storage tank to a general supply pipe running the length of ... pole . In order to force the fluid fram one end of the pole to the other it is necessary to use an inexpensive device ...
... pole to be treated . A lead pipe runs from the elevated storage tank to a general supply pipe running the length of ... pole . In order to force the fluid fram one end of the pole to the other it is necessary to use an inexpensive device ...
Page 22
Marcia Amidon Lusted. PERCH. POLE. These high-flying circus acts aren't over yet! Two performers enter the center stage. One holds a tall pole. The second performer, a flier, climbs to the top. The first performer steadies the pole. He ...
Marcia Amidon Lusted. PERCH. POLE. These high-flying circus acts aren't over yet! Two performers enter the center stage. One holds a tall pole. The second performer, a flier, climbs to the top. The first performer steadies the pole. He ...
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