Back MatterSource: The Scientific Monthly, Vol. 48, No. 6 (Jun., 1939), pp. v-viPublished by: American Association for the Advancement of ScienceStable URL: http://www.jstor.org/stable/16698 .

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THE SCIENTIFIC MONTHLY-ADVERTISEMENTS v

...BERMUDA *..THE FURNESS VOYAGE ..

*~~~~~~

Xn a rainbowu sea"

Cool Breeze-swept Bermuda! Words can merely suggest its charm. And so it is with the Furness voyage. Not until you've walked aboard the "Monarch" or "Queen" explored sunny play decks . . . enjoyed a swim in the spa- cious pool . . . can you appreciate the lavish scale on which these ships were built. Trans-Atlantic liners, they were planned for pleasure and Bermuda travel alone.

Wit:h kindred delights they prepare you for the disarming Brit:ish atmosphere-the easy-going tenor of glorious Ber- muda life. You'll enjoy the Furness voyage as you'll enjoy the Island itself !

Frequent sailings from New York

R 0 U N D T R IP $60 up including Private Bath on the Monarch of Bermuda and Queen of Bermuda. Also low all-expense rates including accommodations at a leading Bermuda hotel.

A'pp/y to your own TRAVEL AGENT or Furness Bermuda Line, 34 WVhitehall Street, or 6341 Fifth Avenue, New York, N. Y'.

U flRNXIE s 7?/t M ut4e7

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vi THE SCIENTIFIC MONTHLY-ADVERTISEMENTS

Ad,venture Shop of Anthony Fiala Complete Equipment for

Explorers, Scientists, Engineers, Hunters and Travelers

We Have Equipped Many Expeditions from the Poles to the Equator

Some of these exploring parties we equipped with practically everything they needed from engineering instruments to rifles, ammunition and food. Our tents, made of Equatorial Water- proof Cloth, have stood the sun of the tropics and the freezing blasts of the Polar regions.

Let us furnish estimates-write us your wants.

The Paulin System Altimeter The Paulin system is the first real improvement in instruments

of this type in over seventy years With a Paulin altimeter accurate surveys of elevations can be made with the minimum of

expense as to apparatus and labor. The Paulin method is particularly valuable for recon- naissance surveys. For example; an engineer who specializes in the placing of sewers makes his preliminary survey now by Paulin altimeter. Previously he used to send a man with an axe, another with a rod, and an instrument man with a level to make these surveys. Now he sends one man with a Paulin altimeter and has a recording barograph in his office or at the station from where his survey starts, to take care of variations of atmospheric pressure. By this method he can put in a bid in one-third the time and at one-ninth the cost of any other engineer using the level and rod method.

Two Army engineers made a survey of over one-thousand miles, each one using a Paulin altimeter. The method used was for one of the men to stay at the station and after comparing watches the other officer started on his hike for a new station fifteen or twenty miles away. Every half hour he would stop and observe his altimeter, knowing that his comrade at station

#1 was doing the same. When he arrived at station #2 he would make a final observation and stay over night. The following day he made observations of his altimeter every half hour. His comrade at station #1 would leave that station and march toward station #2 making his half hour observations during the march as his comrade had done the day before. On arriving at station #2 the two men would stay together over night. In the morning the first officer would start out again for station #3 and so the march would continue, each man alternately marching and stopping at the station until the work was completed. By this method one checked the other and the variation in barometric pressure was taken care of. It is needless to say that they made an excellent and accurate survey.

EASTERN REPRESENTATIVE: The Paulin Altimeter

the most accurate aneroid used for leveling by engineers and geologists.

FIALA OUTFITS, Inc. ANTHONY FIALA, Pres.

10 Warren Street, New York City TELEPHONE CORTLANDT 7-4725 CABLE "AFIALA" NEW YORK

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-WlRATTENS LIGHIIT 1F ILTERS

for Photography, Photomierography, Speetroscopy, Photometryg Astronomy

W TRATTEN LIGHT FILTERS are uni-

versally used in widely separated

fields of scientific research.

The Wratten list includes filters for use

with all types of color-sensitive films and

plates. More than one hundred different fil-

ters are available.

Complete spectrophotometric data are

given in the Eastman publication, Wratten

Light Filters; the price of this 96-page book-

let is 50 cents. A price list of filters will be

f'urnished free on request.

Be sure to visit the Kodak Building at the New York World's Fair-One Hundred

Years of Photography . .. Cavalcade of Color . .. Kodak in Science, Medicine,

Education. Photographic experts to assist you. A genuinely worth-while exhibit.

EASTMAN KODAK COMPANY Researeh Laboratories ROCHESTER, N. Y.

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__ INTRODUCTORY __ CO LLEGE CHEMISTRYX X By Harry N. Holmes

_____ Third Edition, to be published May 23rd. $3.50 (probable)

A little shorter and less difficult than the author's "General Chemistry," this text is particularly well suited to the needs of students who have had no previous training in chemistry. It is notably clear and simple in exposition, and contains a wealth of helpful illustrative material. The present revised edition keeps pace with the rapid changes, both in theory and in application, which have been taking place in modern chemistry.

g THE DEVELOPMENT OF __

__ THE MINKOWSKI GEOME- g X~zz TRY OF NUMBERS:X

By Harris Hancock To be published this summer. $12.00 (probable) O

In his previous two-volume work, "Foundations of the Theory of Algebraic Numbers," Professor Hancock made a major contri- bution to the extension of the fields of arithmetic and algebra. The present work is a sequel to those volumes. By making use of the concepts of geometry, the author broadens the substruc- tures of the generalized realms that are founded on algebra, num- bers and geometry, and ascertains further the teleological nature of such realms.

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