Hudson's Strait and Bay. 



Instructions to Officers in Charge of Stations in Iltnsox'.s 

 Bay and Straits. 

 "As the primary object of the whole expedition is to ascertain for 

 w 1 1 : 1 1 period of the year the Straits arc navigable, all attention is to be 

 t«» the formation, breaking up, and movements of the ice. 

 "Each station is supplied with a sun dial and time piece, and 

 the clock is to be tested each dav when there is sunshine about 

 noon. A table of corrections is supplied for the reduction of appar- 

 ent time to local mean time, to this the difference of time will lie 

 applied to mtit meridian, all cnt ries being made in the time of this 

 meridian, and observations will be taken rcgnlarlv at the following 

 fTp * Ug the year ' viz - : 3h> Sm '> 7h - 8m -' llh - 8m '> A - M - 

 "Each morning the sums and means of the observations taken on the 

 previous da\ will be taken out and cheeked over, thev will then be 

 entered in the abstract hooks supplied f,,r the purpose. 



"After each observation during daylight, the observer on duty will 

 take the telescope and carefully examine the Straits, writing 'down 

 at the time all thai he sees, stating direction and ( when possible) veloc- 

 ity of tide, movement of ice. if anv. also describe the condition of the 

 tee. whether much broken up. solid field, etc.. etc. 



" Tidal tJwrn/tinHs. — Eiu-h day the time and height of high and low 

 water is to be carefully observed, and during the open season the char- 

 acter of the tide will be carefully noted for two d.-tvs before and three 

 days after the full and change of the moon. For this purpose a post 

 marked off 111 feet and fractions of a foot is to be placed in the water 

 at low water in some sheltered spot, if anv such be available, and the 

 height of the water noted every half hour during the rise and fall of 

 one tide on each of these days — the height to be noted net eaivfullv 

 every five^minutes during the hour of high water, and the same at low 



during the most rapid portion ,,f Hie rise. Special observations of baro- 



K\ cry possible precaution is to 

 iticipated that the temperature ca 



