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Single-Phase Locomotives and Motor Cars in Bavaria and Sweden

By Frank C. Perkins

The uses of Natural Asphalt in the Arts

By Felix Lindenberg

Notes on Heat Insulation, Particularly with regard to Materials used in Furnace Construction


By R. S. Hutton and J. R. Beard

Reservoir, Fountain, and Stylographic Pens.—IV

Stylographic Pens of To-day

By James P. Maginnis

The Selection of Portland Cement for Concrete Blocks

By Richard K. Meade

Lightning and the Electricity of the Air—III

Erection of Rods—General Directions

By Alexander G. McAdie

Liquid Crystals

The Renovation of Worn-Out Soils

Experiments with a Lamp Chimney

The Mystery of Man's Capacity to Answer a Simple Question

The Flying and Soaring of Birds Explained by Well-Known Mechanical Principle

By H. LaV Twining

The Chemistry of Plant Assimilation

Contemporary Electrical Science

Science Notes

Trade Notes and Formulæ


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