Reprinted from The Florists’ Review, February 23, 1950 
THE ONLY POS/T/VE METHOD OF APPLYING LIQUID FERTILIZER 
24 ins. wide, 24 ins. high, 64 ins. long. 
18 ins. wide, 24 ins. high, 54 ins. long. : 
5-gal. Delta Dispenser mounted on wheelbarrow mount- 15-gal. Delta Dispenser mounted on wheelbarrow 
ing for greenhouse use. mounting for greenhouse use. 
$137.50 $215.00 
The DELTA DISPENSER and Proportioner is a mechanical unit designed and built for the application of 
liquid fertilizers, to be used in the business of growing plant material. It is not a syphon or a venturi but 
operates on the auto injection principle. Auto injection means that the water through the hose operates 
the Delta Unit, causing it to inject concentrated fertilizer into the hose in a direct ratio to the amount of 
water flowing through that hose. 
Control of the proportions is at the will of the operator. Eight settings are found on a stainless steel dial. 
These settings are made up to give from 1 part to 12.5 parts of water up to 1 part to 400 parts of water. 
By merely turning this dial you select the proportion desired to conform to the mixture placed into the 
Delta as a heavy concentrate. 
A membrane of thin rubber is used to separate the water from the concentrate within the sphere of the 
Delta. This membrane is never on a stretch or strain but merely acts as a separator. The water, which is 
metered into the sphere, pushes against the concentrate separated from it by this membrane, displacing 
it into the hose line, where it mixes with the water. Attached to this membrane or separator is a brass 
rod which projects to the outside of the sphere. This rod travels with the membrane and acts as an 
indicator to tell the operator when the unit is emptied and should be refilled. 
All openings through which the fertilizer passes are !/ inch in size and capable of passing any undis- 
solved particles in the concentrate. 
Brass and bronze fittings are used throughout. One of them, the Binks pressure stopcock, is made of 
the best brass obtainable. They are spring tightened and remain in adjustment. Aluminum is used in 
casting the sphere, for it is resistant to the action of the acids which are used in most fertilizers. It is 
3/g in. thick and is designed to tolerate up to 125 lbs.’ water pressure. 
Any solid material which will mix with water to make a concentrate which will stay in suspension can 
be used in the Delta Units. If it is possible to do so, the mixture should be heavy enough to use the 
lower settings on the unit down to 1-400, since this will produce more gallons of mixture through the 
hose for each gallon of concentrate and make filling less frequent. 
The delivery of concentrate from the Delta Unit may be stopped and 
started by merely shutting off a stopcock in the concentrate line. In 
this way it is possible to obtain clear water without disconnecting 
the hose from the unit. 
Using a setting of 1-400, a one-gallon Delta Unit will furnish 400 gal- 
lons of properly mixed fertilizer, the five-gallon will furnish 2000 
gallons and the fifteen-gallon unit will deliver 6000 gallons. Obviously 
this is the way to apply liquid fertilizers. You do not need a special 
fertilizer line from a tank; this eliminates the upkeep on such an in- 
stallation. You can use the pressure of the water mains and not 
depend upon the drop from a tank, which often does not give ade- 
quate volume. With a Delta you can change from one type of nutrient 
to another in a few minutes, since the mixture is in a concentrated 
form and may be placed into a container and saved for another time. 
Order from 
MITSCH NURSERY 
Q AURORA, OREGON 
12 ins. wide, 17 ins. high, 14 ins. long. DELTA DISPENSER MANUFACTURING CO. 
One-gallon Delta Dispenser portable by hand. 
$75.00 SmaI 37 GOV 
THE ONLY LIQUID FERTILIZER DISPENSER MAINTAINING FULL VOLUME Flow! 
COME SEE IT DEMONSTRATED AT MITSCH NURSERY, AURORA, ORE.(CLOSED SUNDAYS) 
PRICES F.O.B. FACTORY, DOWNEY, CALIF. 
