36 
The Australasian Book of Poultry. 
!■ ig. 30 gives a longitudinal section of the machine, and a glance will explain matters fully. ^ is a 
section of the top rod of the regulator ; B is the damper ; C is the inlet for filling the tank ; D is the outlet 
for emptying the tank ; £ £ is the diaphragm, which, it will be noticed, extends to within a short distance of 
the end of tank opposite the boiler, and the use of which will be explained later ; H is the outer shell or 
jacket of the boiler ; / is the boiler, circular in shape ; AT is a section of the bottom rod of the regulator ; L 
shows dish of the bottom of the egg-drawer ; M is where the evaporating-pans stand ; N is the lamp. Here 
again the double wood of the sides up to boiler level of casing is shown, also the sawdust packing round 
tank. The boiler is packed in cowhair, well rammed, as it is better than sawdust for the purpose. 
Fig. 31 shows a detail of the regulator and fittings which explains itself. A A are hinges, and may be 
made by cutting a notch in top and bottom rods, and forming the ends of upright rods mto hooks. The 
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Fig. 29. — Plan of Bottom, showing Ventilators 
bottom rod should be pivoted at bearing or fulcrum, about an inch and a half from the turned-down end 
which rests on capsule. The top rod is pivoted the same. In the front or vertical rod of the regulator the 
^ top half Tias the end screwed with a fine thread ; the lower half, which passes through the bottom of set 
screw, has the top riveted so as to allow the set screw to turn round. The damper may be suspended by a 
wire hook or loop, and may or may not have an adjustable thumb-screw. The top and bottom rod may be 
of square iron, a quarter of an inch thick ; the front rod may be made out of two pieces of bicycle spoke-wire. 
The bearings, as shown in Fig. 32, should be strong and not set too closely together, or else you will get a side 
motion of regulator. The whole must be true and nicely-fitting. The rods, complete for any size machine, 
can be obtained in Adelaide. 
Fig. 30.— Longitudinal Section, middle of Machine 
In fitting the tank into a machine, it should rest just slightly on the top of the double casing, and should 
be supported by two cradle-bars of dimensions according to size of the machine ; for the large machines 
these cradle-bars must be heated, and fitted exactly to the doming of the tank. For the outlet a tap may be 
used, or a small dead-end, which is obtainable at any ironmonger's. The boiler consists of the cylindrical 
inner boiler, which is full of water — / in Fig. 30 — and the outer shell or jacket, H, which has a small chimney 
to carry off fumes of lamp. The object of the jacket is that the heat of the lamp, after striking the bottom 
of the boiler, passes between it and the jacket and out at the top, so that all the boiler is a heating surface. 
They act very well, and are the best. Looking at Fig. 30, it will be noticed that when the tank is full the 
boiler is also full ; the heat of the lamp causes the heated water to rise and pass through the pipe, G, into 
the top compaitment of the tank, and as long as the heat continues the water must circulate. It goes along 
the top compartment till it gets to the space at the end farthest from the boiler, when it descends into the 
lower compartment and goes back to the boiler to supply the water which the heat, by expansion, etc., is 
