THE AUTOMATIC TEMPERATURE CONTROLLER
A still more recent and valuable improvement is the automatic temperature controller, a thermostatic valve which operates automatically to keep the temperature in the glue chamber between 145° F. and 150° F., or at any temperature for which it is set.
Not only overheating of the glue is prevented, but expense of supervision is reduced. The heater does not need to be constantly watched for fear glue will not be kept at correct temperature.
This particular heater is also provided with a brass agitator (hand or power) for keeping glue thoroughly mixed while melting, and with a special faucet by means of which the melted glue is drawn off without dripping or clogging. It is made in sizes from 2 gallons to 500 gallons liquid capacity, and for use with any heating agent—gas, electricity, or steam.
An apparatus of this kind not only facilitates economical melting of glue, by preventing evaporation, waste, formation of scum, sour and dirty glue, but it also insures uniform “spread.” Furthermore, it is a great incentive to accuracy and cleanliness on the part of workmen, encouraging them to good work by providing them with a neat and clean glue-melting appliance, in contrast with the old-fashioned, unsightly and ill-smelling “glue-pot;” and providing them also with glue that has been properly prepared.