KXI'KDITION TO POINT HARROW, ALASKA. Q 



3, At sea, ;i daih -record \\ill In- Lepl, by dead reckoning mid astronomical ob, nations, of 

 the latitude and longitude of tin- vessel, b\ which the positions al the I imes of mcteoiol, ,^j,-.d 

 Observations will be deduced, and on arriving at I lie /><,, lt /ni, <il si a I ion the local lime and longitude, 

 will be immediately determined, whence the Washington and Gottingen times will be found by 

 applying the rorreclion for longitude. 



4. All meteorological and tidal observations will be made at exact hours of Washington civil 

 time. (The longitude, of Washington Observatory is r>'> S" lii\(M west of Greenwich.) The regular 

 magnetic observations will be made at even hours and minutes Of Gdttingen mean time, Mloliin 



is 0'- :;!'" 4G S . 24 east of Greenwich, or 5 1 ' 47'" 5S S .: cast of Washington; whence U noon \Va>h- 

 ington time is simultaneous with 5' 1 47'" 5S".33 p. in. Gottiiigen time, or (i ; !i" ]-.<>! a. in. Wash- 

 ington time is simultaneous with ID noon at Gottiugen.) 



I hourly meteorological observations of all these phenomena cannot be taken, then, if possible, 

 take bi-hourly observations at the hours 1, 3, 5, 7, !, 11 a. in. and p. in., or at Irnxt six observa- 

 tions at 3, 7, and 11 a. in. and p. in. On no account will the meteorological observation at 7 a. in., 

 Washington time', be omitted. 



">. Upon arrival at the permanent station the local time and longitude will be determined at 

 once, without waiting for the erection of permanent shelters which will be built for the meteorolog- 

 ical, magnetic, and astronomical instruments, according to the plans and material as specified. 



The meteorological and astronomical observatories will be located conveniently near to the 

 dwelling of the observers, but that of the magnetic observatory will be determined by the con- 

 sideration that these instruments must be removed from all danger of being afl'ectcd by the 

 presence of steel or iron, including galvani/.ed and tinned iron. If needed to keep oft' intruders, 

 a guard or fence should surround the magnetic observatory. 



(i. The observation of tides will be made as complete! a.s possible in summer by a gauge on the 

 shore, and in winter through an opening in the ice, according to the instructions furnished 1>\ the 

 Superintendent of the United States Coast and Geodetic Survey. Tho necessity for observing the 

 tides will suggest that the dwelling-house 1 should be located as near the sea as is safe and con- 

 venient. 



7. In addition to the ship's log and the official journal of the party, to be kept by the com- 

 manding officer, and the official record of observations, to be kept by the meteorological, magnetic, 

 tidal, and astronomical observers, each member of the party will be furnished with a diary, in 

 which he will record all such incidents as specially interest him. This diary will not be open to 

 inspection until delivered to the chief Signal Oflicer for his sole, use in compiling the full record 

 of the expedition. 



8. Accurate representations, cither by the photographic process or sketching, will be made of 

 all phenomena of an unusual character, or of whatever is characteristic of the country . 



y. Carefully prepared topographical maps will be made of as much of the surrounding country 

 as is practicable. 



II. DETAILED INSTRUCTIONS CONCERNING OHSKKVATIONS, INSTRI-.MEMS, AND TIME, r,v THE 



INTERNATIONAL POLAR CONFERENCE, HAMItl'lKJ, 1879, OCTOBKK 1 TO 5. 



[TrmiNlati-d ;it the ollice ol'tlir chief Sinmi] Ol'ti<-ei-. with uddi-d notes in li;-;n-'i-is. ] 

 1. OULHiATOKY OBSERVATIONS IN THE DOMAIN Ol-' -MKTEORi >M >< i Y 



No. 17. T<-tiipti-iit>r of tin ttir. The mercurial thermometers should be graduated to two- 

 tenths degrees Centigrade, and the alcohol thermometers to \\hole degrees, and both verified at a 

 central meteorological .station to within one-tenth degree Centigrade. 



i The thermometers furnished are graduated to Fahrenheit : they have been compared with the 

 Signal Service standard, and are provided with correction cards, j 



No. 18. The instruments should be placed at an altitude <:!' between 1..". and L'.O meters t ."> to G 

 feet), and it is recommended that they be exposed in a double shelter of lattice work, according to 

 II. Kx. 44 U 



