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The rivalry between Savery and Papin appears to have stimulated attention to the question of fuel saving. Dr. John Allen, in 1730, called attention to the fact that owing to the short length of time of the contact between the gases and the heating surfaces of the boiler, nearly half of the heat of the fire was lost. With a view to overcoming this loss at least partially, he used an internal furnace with a smoke flue winding through the water in the form of a worm in a still. In order that the length of passage of the gases might not act as a damper on the fire, Dr. Allen recommended the use of a pair of bellows for forcing the sluggish vapor through the flue. This is probably the first suggested use of forced draft. In forming an estimate of the quantity of fuel lost up the stack, Dr. Allen probably made the first boiler test.

The water of the stream was of a dirty yellow, and very turbulent owing to the strong wind that was blowing and the violent current. Proceeding up stream, we then came to a hill 300 ft. high on the right, which ended abruptly in an almost vertical red and yellow cliff plunging into the water. On the opposite side of the river, along the narrow neck, were lowlands, quite open and scantily wooded, over which rose great columns of black smoke, caused by the natives burning down the forest in order to prepare the land for their plantations. It was at this point that the entire volume of the Amazon could be gauged at a glance. As you looked up stream a long bluish line of low forest could be perceived over the gradually expanding deep yellow river. Dozens upon dozens of columns of smoke were visible. When night came the effects of those forest fires, with the reflection of the light upon the low clouds and in the water, were very weird and beautiful.

• Nicholas Bredimus
• Nicholas Bredimus
• Nicholas Bredimus
• Nicholas Bredimus
• Nicholas Bredimus

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