Page:Popular Science Monthly Volume 92.djvu/81

 Popular Science Mont Id y

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���A Giant Forging Hammer Which Weighs Six Hundred Tons

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��The Sugar Shortage Is a Blessing in Disguise

FROM the standpoint of hygiene and economy, changes in diet represent a positive gain. For instance, take sugar — a food which yields more calories per unit of cost than any other food, but which, on the other hand, gives us nothing but energy. It contains no protein and no mineral value, elements which are essential. So the present sugar shortage is a blessing in disguise, for we are obliged to substitute in its place vegetables and fruits, which are real body- building foods. Had we made this simple substitution many years ago we might have been a sturdier race to-day. A small electric heater arranged in the

water circulation system of an aquarium

Keeping the Fish in the Aquarium Comfortable in Winter

WHILE it is true that there is no heat provided for the fish in the rivers a blow of eight thousand tons was recently and lakes during the winter, it does not installed in an ordnance plant. It re- follow that the fish in the small glass quired fourteen railroad cars to ship the aquariums do not suffer when

hammer in sections to its destination. ^^.. the mercury in the thermometer

The main steam pipe, which admits a steam pressure of from one hundred to one hun- dred and fifty pounds into the giant cylinder, is ten inches in diameter. The ram is fifty- one inches wdde, sixty-six inches front to back and seventy-two inches high. The approximate weight of the die alone was ten tons. The whole superstruc- ture is mounted on four massive ped- estals. The main cylinder is lined with cast-iron bushing of special mixture. The cylinder proper is mounted between the two main frames and it is securely bolted with body-round bolts, the frames being shrunk to- gether with four large rods.

���This huge steel forging hammer is the largest of its kind ever built in the United States

��drops suddenly.

The accompanying pho- tograph shows how a New York artist provided for the comfort of his gold fish and kept the water in his aquarium at just the proper temperature all winter long. He arranged a small elec- tric heater in the water cir- culation system of the aquarium and regulat- ed it so that the water never varied from the temperature which has proved most agreeable to the fish. It was in- teresting to watch the fish swim madly about on one occasion when the heater did not keep the water at just the correct temperature. They noticed even the slight change al- most immediately.

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