Annual Report of the Board of Regents of the Smithsonian InstitutionThe Institution, 1921 |
З цієї книги
Результати 1-3 із 26
Сторінка 140
... tube could slide , thus allowing for the change of azimuth . The tube of the astrographic telescope was circular in section , and could rest in any position in the V's ; for convenience it was adjusted so that the directions of right ...
... tube could slide , thus allowing for the change of azimuth . The tube of the astrographic telescope was circular in section , and could rest in any position in the V's ; for convenience it was adjusted so that the directions of right ...
Сторінка 179
... tube used in properly designed circuits . Although the vacuum tube was invented in 1906 , its development into a sufficiently practical form to be useful for wireless telephony was comparatively slow . This development was greatly ...
... tube used in properly designed circuits . Although the vacuum tube was invented in 1906 , its development into a sufficiently practical form to be useful for wireless telephony was comparatively slow . This development was greatly ...
Сторінка 184
... tube which has been designated as a regulator tube . At the lower limit of the operating speed range , namely , 4,000 revolutions per minute , the filament of this regulator tube operates at a temperature which gives practically no ...
... tube which has been designated as a regulator tube . At the lower limit of the operating speed range , namely , 4,000 revolutions per minute , the filament of this regulator tube operates at a temperature which gives practically no ...
Зміст
Bureau of American Ethnology | 17 |
Report on the United States National Museum | 25 |
EXECUTIVE COMMITTEE AND REGENTS | 100 |
28 інших розділів не відображаються
Інші видання - Показати все
Загальні терміни та фрази
acromegaly actinium agriculture airplane American appears areas astrographic atom birds blueberry body Bohemia Bureau Calama cent chilling cicada collection color crops culture dormant early eclipse eggs elephants entomologists expedition feet field forest gases geographic geological survey glands glass Government growth Guatemala helium important increase Indians insects interest investigations irrigation J. J. Thomson June 30 land mammoth Manchuria material ment method milpa National Museum natural nebulae Observatory observed obtained opal oxide park period photographs plants plates present production publications pupa radiation radium Ramsay Rathbun recent reclamation region right ascension River scientific Secretary shown Smithsonian Institution Smithsonian Report Sobral solar solar constant South species specimens spiral nebulae spirals stars supply temperature tion trees tropical tube United vacuum tube Valley vitreous volumes Washington wireless telephone