that instruments located at or above eye 

 level can be read more easily. In the last form, 

 the legs were widespread to increase stability. 

 In another model the height of the sides, 

 front, and back was increased to allow for 

 the use of higher instruments; the back was 

 15 inches high and the front 11 inches high. 

 General Description 



The shelter is constructed of Vs-inch 

 Tempered Masonite Presswood nailed to 

 pine, cedar, or cypress lx2-inch lumber. It 

 has a double roof, ventilated at the ends to 

 prevent warming in sunlight. The frame is 

 left open at the ends, and the sides of the 

 shelter are perforated with drilled Vi -inch- 

 diameter holes to allow free circulation of air 

 around the instruments in the shelter. 



Dimensions of the shelter are shown in 

 figure 2. The floor stands 18 inches above 

 the ground. Outside dimensions are 2 feet 

 long and 1 foot wide; the back side is 13 

 inches high, and the front 9 inches high. The 

 ( Continued on page 4 ) 



List, of Materials for One Shelter 



Tops and sides of the shelter are made of Tem- 

 pered Masonite Presswood, smooth two faces. The 

 difference in cost between the smooth one surface 

 and the smooth two surfaces is less than the cost 

 of the extra paint used on the rough surface. 



Masonite parts ( all pieces to be drawn on the 

 Presswood prior to sawing to prevent waste ) : 

 Top 16" x 27" 2 pieces 



Ends 12" x 9" 2 pieces 



Front 24" x 9" 1 piece 



Back 13" x 24" 1 piece 



Bottom 12"x22 1 / 2 " 1 piece 



Parts made from lx2-inch planed lumber: 

 Front legs 28" x 1" x 2" 2 pieces 



Back legs 31"xl"x2" 2 pieces 



Longitudinal braces 22 1 /2"xl"x2" 4 pieces 

 IOV2" x 1" x 2" 2 pieces 

 11%" x l"x2" 2 pieces 

 27" x 1" x 2" 2 pieces 

 6" x 1" x 2" 4 pieces 



Bottom end braces 

 Top end braces 

 Roof spacers 

 Blocks 



Hardware : 

 Hinges 



( brass butts ) 

 Hasp 

 Hasp loop 



%" x 2" 2 pieces 



1" x 3" 1 piece 



l"x Wz" 1 piece 

 V-i pound sixpenny, galvanized, adhesive-coated 



nails ( enough for 3 ) 

 1 pound 3 4-inch, flathead galvanized roofing nails 



( enough for 3 j 

 Screws for hinges, hasps, and hasp loop ( usually 

 provided ) 



For one shelter, 30 linear feet, allowing 5 feet 

 for trimming loss ( blocks are made from trim ), 

 of lx2-inch lumber is needed. Six shelters require 

 180 linear feet of lx2-inch lumber and 3 sheets of 

 4x8 Tempered Masonite Presswood. Five Sheets of 

 Presswood will make 12 shelters, with 360 linear 

 feet of 1 by 2. 



. * 



double roof. 



I"X2" roof . y 

 spacers"' 





■ 



k 



(I 



Figure 2. — Diagram of instrument shelter showing 

 construction details. 



