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THE NEW YORK
PUBLIC LIBRARY

41712A

ASTOR. LENOX AND
ILDEN FOUNDATIONS

102. L

COPYRIGHTED, 1921,

BY
THEO. AUDEL & CO.,

NEW YORK

Printed in the United States

NOTE

In planning this helpful series of Educators, it has been the aim of the author and publishers to present step by step a logical plan of study in General Engineering Practice, taking the middle ground in making the information readily available and showing by text, illustration, question and answer, and calculation, the theories, fundamentals and modern applications, including construction in an interesting and easily understandable form.

Where the question and answer form is used, the plan has been to give short, simple and direct answers, limited to one paragraph, thus simplifying the more complex matter.

In order to have adequate space for the presentation of the important matter and not to divert the attention of the reader, descriptions of machines have been excluded from the main text, being printed in smaller type under the illustrations.

Leonardo Da Vinci once said:

"Those who give themselves to ready and rapid practice before they have learned the theory, resemble sailors who go to sea in a vessel without a rudder"

-in other words, "a little knowledge is a dangerous thing." Accordingly the author has endeavored to give as much information as possible in the space allotted to each subject.

The author is indebted to the various manufacturers for their co-operation in furnishing cuts and information relating to their products.

These books will speak for themselves and will find their place in the great field of Engineering.

Contents of Guide No. 2

19. Multi-Stage Expansion Engines..... 603 to 642

Conditions for economy--one cylinder losses—condensation-effect of

clearance--compound engines: 1, direct expansion; 2 receiver types

-expansion with "drop"-cylinder ratio-variable load with: 1, varia-

ble cut off; and 2, throttling control-combined diagrams-diagrams
of the authors two cylinder transfer expansion oscillating engine---
triple expansion engines-operating conditions-sequence of cylin-
ders and cranks-diagrams-quadruple expansion engines-oper-
ating conditions.

27. Steam Hoists..

765 to 802

Introduction-glossary-classes of hoist—simple hoist-boiler-engine

--power transmission-drums—foot brakes-double drum boom

swinging hoist—logging engines and log skidding-mine hoists—cone
drum, and reel hoists-capacity-limit of depth in hoisting.

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