EXPERIMENT STATION BULLETINS. 205 



PAINT. 



All the parts of the system not galvanized were painted with 

 aluminum paint. If at any time the barn is repainted, it would do 

 no harm to paint the cables also. 



GENERAL DESCRIPTION OP PUTTING UP THE LIGHTNING RODS — NUMBER AND 



LOCATION OP GROUNDS USED. 



Figure 3 gives the relative size and location of the various barns, 

 which have the following number of points and grounds. 



Barn. Points. Grounds. 



Tool barn 6 (one on chimney) 3 



Pure bred herds barn 8 4 



Grade barn 5 3 



Sheep barn 5 3 



Bull barn 5 3 



Horse barn 2 2 



This aggregates 31 points and 18 grounds, less than two points for 

 each ground. About 2,000 feet of cable was used on the six barns. 



RODDING ON GRADE BARN. 



Let us now consider one of the barns as an example and discuss the 

 general method of putting up the rods. Figure 4 shows a west elevation 

 of the grade barn. The silos are on the east side. On the west side 

 are a series of small cattle yards. At the northeast corner is a door 

 which is the most frequently used of any in the barn. The water 

 drains off the roof on each side at about the center. Clearly we do 

 not want our ''grounds" any nearer than necessary to cattle that might 

 be in the small yards adjacent to the west side of the barn, nor do 

 we want a ''ground" at the northeast corner because of the close 

 proximity of the door. We do want a "ground" where the water from 

 the eaves runs into the ground because the earth there will always 

 be wet. If the water from the roof drained off any of the corners of 

 the barn we would put one of our "grounds" there at once; but if 

 manure will be regularly piled near one of those corners we would not 

 put a "ground" at that corner as the liquid from the manure has a 

 corrosive action on metals. These are some of the things considered 

 in locating the "ground" connections. We finally decided on our 

 "grounds" as shown in Figure 4. 



The next question is as to the location of the points. The cupolas, 

 being the highest points on the barn, should be protected as should the 

 ends of the barn where the track is supported. We decide then on 

 five points which should be as nearly equidistant as possible. The 

 cupolas are not an equal distance apart owing to the fact thnt the 

 south end of the barn was an addition to the original. Therefore 

 we planned to put points on the right ends of cupolas 1 and 2 and 

 on the left end of cupola 3. (See Figure 4.) 



