1915] The Ottawa Naturalist. 49 



All exposed work may be in oak or other wood to match 

 fittings a,lready installed. 



Sash. 



To be IH inch thick of common stock pattern — rails and 

 styles 2 inch wide from glass to jamb, and of sizes as shown. 



Top and Sides. 



May be of ?^ stuff with H inch by IH rebate along sash 

 jamb or may be built up of two thicknesses of X inch stuff. The 

 inner lining being of matched stuff well cramped together and 

 blind nailed. 



Diaphragm to be supplied only where desired. 



To be of J4 inch stuff fastened together with flush end 

 styles well nailed to prevent warping. All should be covered, 

 both sides with burlap or other covering material, or paneled 

 according to decoration or other scheme of museum. Dia- 

 phragm to be held upright and in place by 1 inch by 1 inch by 

 }4 inch iron angles screwed to top and bottom of case on either 

 side of diaphragm. For three-foot cases there should be two 

 pairs of such angles, top and bottom, and for six-foot cases there 

 should be three such pairs. Diaphragms may be moved to any 

 situation in case by changing position of angles. 



Shelves. 



Shelves for light specimens may be supported by screw eyes 

 inserted in ends and diaphragm or mullions as indicated on 

 drawings, turning them flatways and allowing them to project 

 enough to engage shelves. For heavy specimens, iron brackets — 

 stock sizes, or Shrosbree specimen hangers may be used when- 

 ever needed. If a coarse burlap is used over diaphragm, screws 

 may be put in and removed as many times as necessary without 

 causing disfiguring scars on the surface. 



Base or Mopboard. 



To be stock 6 inch base of whatever design may be desired 

 and may be readily obtained at local lumber yard or mill. 



Sides. 



All sides of cases to present perfectly flush surface, so that 

 two or more cases may be butted together to appear as one case 

 without tmsightly or dust catching spaces between. 



Cases may be made in units of either 1 or 2 sash. A 1 

 sash case will then be just half the length of the 2 sash cases 

 and will line up with them in series. The sashes are to be fas- 

 tened in place by 2^ inch brass, round headed screws, driven 

 through the sash into the frame behind. With this method 



