ON LIGHTHOUSE CHARACTERISTICS. 413 



west end of Plymouth Breakwater, into eclipsing 

 lights, and that a similar improvement has been 

 promised for five more of the fixed lights under 

 their charge (Mucking, Lowestoft, Chapman, 

 Flatholm, and Evan) within the official year 

 1 880- 1. 



III. OCCULTING OR ECLIPSING LIGHTS. 



The 22 eclipsing lights at present existing in the 

 British Islands are described in the preceding Table 

 (see page 412), extracted from the Admiralty List 

 of Lights for iSSi. 1 



To these is to be added the Cardross Light on the 

 Clyde, at present a red light, but which, before the 

 end of next month, is to be converted into a white 

 eclipsing light of the same character as the Craig- 

 more light in Rothesay Bay, long-short-long-short. 

 It was judged by the Trustees of the Clyde 



1 Since the publication of this List, it has been announced that 

 the Chapman Light, on the Thames, is to be '''occulting, twice in 

 quick succession every half-minute" which is the same as Garvel 

 Point, on the Clyde, except that the period is half -a- minute, instead 

 of the eight seconds period of Garvel Point. 



