. Cyclopedia of farm crops. Farm produce; Agriculture. Pig. 657. A good Fig. 658. The heater. Heater (Fig. 658).—This is a deep tubular pan, with sap all around the tubes. It is set at the chimney end of the arch and the flames must all pass through the tubes. The idea is to utilize more of the heat. But it is hard to clean, the sap must be carried by a tube to the front end of the evap- orator, and altogether it gives so much trouble that it is less used now than formerly, most farmers prctferring to utilize the heat by means of a longer evaporator. Iiiterehangeahle paiu.—Two of thes
. Cyclopedia of farm crops. Farm produce; Agriculture. Pig. 657. A good Fig. 658. The heater. Heater (Fig. 658).—This is a deep tubular pan, with sap all around the tubes. It is set at the chimney end of the arch and the flames must all pass through the tubes. The idea is to utilize more of the heat. But it is hard to clean, the sap must be carried by a tube to the front end of the evap- orator, and altogether it gives so much trouble that it is less used now than formerly, most farmers prctferring to utilize the heat by means of a longer evaporator. Iiiterehangeahle paiu.—Two of these, each with two compartments, are shown at the chimney end of the evaporator (Fig. 652). The "niter" settles and hardens on the bottom of the rear section, or, at the most, the last two sections. When it reaches the eleven-pound syrup it is held only in suspension and slowly settles on the bottom of any pan where such syrup is boiling. There it burns or hardens on, retards the boiling and, if left on too long, gives the syrup a burnt or sort of caramel flavor and color. It is hard, and is removed with chisels, which injure the pan. This takes time, and the boiling must stop. But, if the fire is slackened a little, the siphons can be removed and in a moment two men can interchange the last two pans (four sections). Then the boiling at once proceeds and the thinner, sappy syrup soon removes the sedi- ment. This interchangeable feature seems to be valuable for this reason. The rear pans are not corrugated, as flat bottoms are better for syrup, which boils with fire, and they are more easily cleaned of their hardened sediment. Boiling.—The cold sap enters immediately over the fire from the store-troughs, through an inch rubber hose or tube. Its rapidity of flow is adjusted to any rate of boiling, no matter how variable, by an automatic float-regulator, a little device that sits in the sap at the front corner of the evaporator and never fails to do it
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