*>., Singapore* 
April 8th,1907. 
H.N.Ridley t Esq*P.R.S.etc. 
Botanic Gardens. 
Singapore* 
. 
# — 
Dear Ridley, ^ 
In making the follovring estimate of the c 
of running your proposed pumping plant,I assume that your 
* 
requirements per day,during sixty days of drought.in the 
* 
'* 
year,will be : - 
Supplied from high level tank ... * 5000 Gallons 
* 
Supplied from stand pipes.. 600 ' * 
After making ample allowance for obstructions in 
delivery piping and so forth I find that the pumping set 1 
recommended by Hovrarth,Srskino (which consists of a powers 
' V . , . f 
force pump goardd to a two horse—power oil engine) is easil 
capable of delivering 600 gallons an hour to the height you 
* * 
mentioned - 30 feet. The plant would therefore be running 
* 
for 360 hours only and the detailed cost per annum would be 
t t * t 
as fellows : - 
• , 
a. Tank Kerosins Oil,90 gallons at 37 cts. . . $34.30 
-** I 
b. Attendants wages at the rate of 30 cts 
■per diem . . . 12.00 
c. Waste,lubricating oil and sundries.10.00 
d» Repairs and renewals,say 5 por cent on the • • 
capital outlay of §2500 125.00 
A total of $171.30 a year . 
It is obvious that item "d* is absurdly over— estimated 
• * * 
for the number of hours running and I have no doubt that H 
Howarth,Srskine would be prepared to guarantee to 
# 
necessary renewals and keep the plant in thorough 
upply any 
working 
