TIME-RECKONING. 



129 



tical men. Simply to illustrate one mode, Figures 6 and 7 are 

 supplied. 



Fig. 6. Fio. 7. 



The object is to indicate cosmopolitan and local time by the same 

 watch. Fig. 6 shows the watch case open, with the dial for cosmo- 

 politan time exposed. Fig. 7 shows the watch case closed, with the 

 local time numerals engraved on the face of the case, the latter being 

 pierced in order that the hands may be seen. The local time disc 

 is designed to be adjustable for any one of the 24 lettered meridians. 

 By this arrangement only the local hours would vary ; there would 

 be a complete coincidence in the minutes of cosmopolitan and local 

 time at every station. The application of double dials to a watch 

 may be effected in another manner. The watch may have two faces 

 back to back; one for for cosmopolitan time, the reverse for local 

 time, the hands in both instances being moved by the same wheel- 

 work, and those for local time supplied with the means of adjustment 

 for change of longitude. 



The latter plan has advantages peculiar to itself. Other methods 

 of construction may be proposed, but it is unnecessary ; the present 

 object is simply to show that there is no practical difficulty in the 

 way of carrying the scheme of time reckoning set forth in the accom- 

 panying paper into the practice of daily life. 

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