50 



The Ottawa Naturalist. 



[June-July 



neither locks or hinges are necessary, and all can be constructed 

 by an ordinary carpenter without special joinery skill. 



Glass. 



To be the sizes shown and of as good quaUty as procurable 

 tinder the circumstances. The principal faults to be looked for 

 being color, waves, bubbles or flaws. 



Diaphragm 

 SECTlOri A-A 



Diapbragmi 



^ 





Section p-p 

 Scale: it" 1' 



ii.LE:V>Oriort 



SczJe . 4" 



m 



r 



Plan of corner 



OF- A CASE WHtRC, 

 SlJiaS tMO IS OESlRtD. 



Section c-c 



Scale 



Section B-B 



A CHEAP case: rOR MU5E:UM5 



OESISMEX) BY HARUAN 1. SMITH 

 WITH 

 PLAN UNO SPECiriCATlOH . BY P. A . TAVtRNtR 



GEOLOGICAL SURVEY. CANADA 



