110 



CONSTRUCTION 



and 48 inches long. The smaller one measures 9 inches high, 24 inches 

 wide and 32 inches in length. For the larger size 1^4 -inch lumber is used, 

 which is about \y% inches when dressed. Here a board 16 inches wide 

 is used, avoiding seams in any of the sides, there being but one in the 

 bottom. The side and bottom boards are rabbeted to }4-inch depth and 



Fig. 88. Wooden Tank 



V/ 2 inches from edge to receive the ends. Bottom boards are tongued 

 and grooved. All joints should receive a preliminary coating of white 

 lead paint. After this is dried, a thicker coat should be applied just 

 before putting joints together. The tank is then clamped and 1^4 -inch 

 screws inserted through the sides into the bottom and ends, and through 

 the bottom into the ends. Cleats 3 inches wide are placed across centre 

 of bottom and all the way around the ends. Through the top of latter 

 is passed an iron rod J4 mcn thick, then secured and tightened with washer 

 and nut at ends. The smaller tank is constructed in the same manner, 

 except that cleat across centre bottom, and the iron rods are omitted. 



While painting the outside improves the appearance, it has more of 

 a tendency to rot a tank than preserve it, as the paint prevents the 

 evaporation of the moisture naturally gathered from the inside. Leaks 

 will usually correct themselves in a few days, but should they not do so, 



