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SA Supplements Vol 43 Issue 1103supp

SA Supplements

Volume 43, Issue 1103supp

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Features

The Elevated Tracks of the New York Central Railroad in New York City

The Hardie Compressed Air Motors

Herman Haupt

Rock Dredging on the Rhine

The Curves described by the Pedals of a Bicycle

A. Gillard

Know your Machines

Measurement of Time by Clepsydras

How to Test the Relative Hardness of Metals

New Cock for Compressed or Liquefied Gas Receptacles

Amber, Ancient and Modern

Test of a Compressed Air Reservoir taken from a Hardie Motor after having been in use Two Years

Herman Haupt

Selected Formulæ

Electrical Notes

Engineering Notes

Miscellaneous Notes

The Restoration of the Venus De Milo

Electricity on Farms

Electrification of Air by Roentgen Rays

A Quarter of a Century's Work on Respiration

C. F. Townsend

Ants as Property Holders

O. W. Oestlund

Horticulture and Health

Common Freaks of Nature

Patents!