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Scientific American Supplement, No. 384, May 12, 1883   By:

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[Illustration]

SCIENTIFIC AMERICAN SUPPLEMENT NO. 384

NEW YORK, MAY 12, 1883

Scientific American Supplement. Vol. XV., No. 384.

Scientific American established 1845

Scientific American Supplement, $5 a year.

Scientific American and Supplement, $7 a year.

TABLE OF CONTENTS.

I. ENGINEERING. Locomotive for St. Gothard Railway. Several figures.

The Mersey Railway Tunnel.

Dam Across the Ottawa River, and New Canal at Carillon, Quebec. Several figures and map.

II. ARCHITECTURE. Dwelling Houses. Hints on building. By WILLIAM HENNAN. Considerations necessary in order to have­ thoroughly sweet homes. Experiment illustrating the necessity of damp courses. How to make dry walls and roofs. Methods of heating. Artificial lighting. Refuse. Cesspools. Drainage

House at Heaton. Illustration.

A Mansard Roof Dwelling. 2 figures.

III. ELECTRICITY. The History of the Electric Telegraph. Documents relating to the magnetic telegraph. Apparatus of Comus and Alexandre. Origin of the electric telegraph. Apparatus of Lesage, Lemond, Reveroni, Saint Cyr, and others. Several figures.

Electrical Transmission and Storage. By DR. C. WM. SIEMENS.

III. MEDICINE AND HYGIENE. Malaria. By Dr. JAMES SALISBURY. VII. Report on the cause of ague. Studies of ague plants in their natural and unnatural habitats. List of objects found in the Croton water. Synopsis of the families of ague plants. Several figures.

Ichthyol.

Autopsy Table. 1 figure.

The Exciting Properties of Oats.

Filaria Disease.

IV. CHEMISTRY. Preparation of Hydrogen Sulphide from Coal Gas. By J. TAYLOR. 1 figure.

Setting of Gypsum.

V. TECHNOLOGY. On the Preparation of Gelatine Plates. By E. HOWARD FARMER.

Pictures on Glass.

VI. NATURAL HISTORY. Survey of the Black Canon.

The Ancient Mississippi and its Tributaries. By J. W. SPENCER.

VII. AGRICULTURE. The Spectral Masdevallia. Illustration.

LOCOMOTIVE FOR ST. GOTHARD RAILWAY.

We give engravings of one of a type of eight coupled locomotives constructed for service on the St. Gothard Railway by Herr T.A. Maffei, of Munich. As will be seen from our illustrations, the engine has outside cylinders, these being 20.48 in. in diameter, with 24 in. stroke, and as the diameter of the coupled wheels is 3 ft. 10 in., the tractive force which the engine is capable of exerting amounts to (20.48² x 24) / 46 = 218.4 lb. for each pound of effective pressure per square inch on the pistons. This is an enormous tractive force, as it would require but a mean effective pressure of 102½ lb. per square inch on the pistons to exert a pull of 10 tons. Inasmuch, however, as the engine weighs 44 tons empty and 51 tons in working order, and as all this weight is available for adhesion, this great cylinder power can be utilized. The cylinders are 6 ft. 10 in. apart from center to center, and they are well secured to the frames, as shown in Fig. 4. The frames are deep and heavy, being 1 3/8 in. thick, and they are stayed by a substantial box framing at the smokebox end, by a cast iron footplate at the rear end, and by the intermediate plate stays shown. The axle box guides are all fitted with adjusting wedges. The axle bearings are all alike, all being 7.87 in. in diameter by 9.45 in. long. The axles are spaced at equal distances of 4 ft. 3.1 in. apart, the total wheel base being thus 12 ft. 9.3 in. In the case of the 1st, 2d, and 3d axles, the springs are arranged above the axle boxes in the ordinary way, those of the 2d and 3d axles being coupled by compensating beams. In the case of the trailing axle, however, a special arrangement is adopted. Thus, as will be seen on reference to the longitudinal section and plan (Figs... Continue reading book >>


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