THE GARDENERS' CHRONICLE OF AMERICA. 



211 



interfere at all with the lawn mowers, heing so laid thai 

 the blades pass over them. The spacing of the sprinklers 

 depends on the available volume of water and the pres- 

 sure and the nature of the top used. .\ circle whose 

 diameter is the diagonal of a 20-foot square seems in 

 practice to be the maximum area over which water can 

 be uniformly distributed from a single sprinkler top. 



Sprinkling sxstems with underground piping were in 

 use before the development of the Los Angeles system, 

 but all made use of the principle of hose sprinkling with 

 the constant diminution of pressure proportionate to the 

 length of hose and number of sprinklers. The Los 

 .Angeles system differs distinctly in this respect, and 

 therein lies the secret of its success over all earlier sys- 

 tems. The principle involved is merely that of the ap- 

 plication of pressure to a body of w-ater confined and 

 motionless. The feed pipe forming a complete circuit 

 is of sufficient capacity to furnish all sprinklers with their 

 maximum capacity, and so when the valve is opened and 

 pressure applied the pressure and distribution are the 

 same for each sprinkler. 



The first installation in Los .Xngeles was made in 

 Central Square and the single feed system was used. 

 There are eleven circuits in this park dnd each carries 

 36 half-inch \\'ilgus sprinklers covering an area of a\)- 

 proximately 17,000 square feet. The total area of Central 

 Square is 5 acres with 4.3 in lawn. An attendant waters 

 this park thoroughly with the automatic system in two 

 hours at a cost of about 70 cents. As it formerly required 

 two men the entire day to perform the same work at a 

 cost of $5, the saving effected is $4.30, or over 80 per cent. 

 Also the expense for the purchase of hose is eliminated. 

 This system has been in operation for over three years 

 and has given perfect satisfaction. The only danger is 

 that the workmen, unless carefulh' watched, will givc 



ihe lawns too nuich water. Within the last two years 

 some 40 acres of new lawn in Los Angeles parks have 

 been put in with this system. The Skinner system is 

 also employed on areas of such shape as this system is 

 best adapted to, and also on our flowering and herbaceous 

 liorders. All new lawn now put in by this department 

 is provided with one or the other of these systems, and 

 it is planned eventually to replace our present hose sys- 

 tems in use on the old lawns with these systems. 



Requests for the details of this system have been re- 

 ceived from many sources. The system is simplicity 

 itself, the only secret being not to overload the supply 

 pipe. In using this system in heavy soil, under drainage 

 should be provided, and in a section having frost in winter 

 a provision should be made for draining the system in 

 winter and the sprinkler tops should be plugged or re- 

 placed by caps. 



The cost of installation is from $400 to $800 per acre, 

 according to conditions. If galvanized or dipped pipe is 

 used, the life of the system should be fifteen or twenty 

 years. 



INTERNATIONAL 

 SPRING FLOWER SHOW 

 New York, March 15-23, 1915 

 under the auspices of 

 Horticultural Society of New York, 

 New York Florists' Club 

 Preliminarj/ Schedules may be obtained from 

 JOHN YOUNG, Secy., 

 53 W. 28th St.. New York. 



AtlTOMATIC LAWN SPRINKLING SYSTEMS 



N? 1 UNDERGROUND PIPE SYSTEMS 



0~— t— O O O O O O O O C 





;'yBje« tuje^t 



Single Teed System 



</l . 



Double: Teed System 





E=^I3=J. 





Standpipes Too. Both Systems 



IIC,.L..J.,.,, I„i.l„l 



Al]TOM.\TIC I/A^WN SPRINKLING SA'STEM 



N? 2 PERFORATED PIPE SYSTEM 



X ff^ otrfora^tj every }iit)l6'f 'i/ , 



'Hooe or iron hoxu m Kolk To conceal vn/vei J 



.^ 



Mai nftta pipCi 



ffaferrieii uni 



a iorayed i>y Tkis syi Tern 



GENERAL PLAN OF INSTALLATION 



Scale- 1 in • iojl. 



Handle To aaiuii aitale of spray -y 

 fciien-tecl~^Jiiiihl>U union —, 

 ? piae- per^eroTea every liitls'^-y 

 » ^ 



i of ..Ik 



I2_ 



I- elk ^"^ 

 r (fate valvi 



,_S^ Wood or iron dok in walk To 



conceal valve a f/Winas 



yr 



Mem feea piae ' 



detail elevation 



Scale- li in. I ft 



DETAIL PLAN 



I 3Cst -le^tu/c in'f-.fec^ ■ 



Illustrations and Diagrams Loaned by The American City. 



