ARE SO POPULAR.

The _American Steam Engineer_ of New York, which is the official organ

of the rapidly growing American Order of Steam Engineers, says in its

issue of March 1, 1888:

“The peculiar hold which the Grimshaw ‘Practical Catechisms’ have on

the constituency for which they are intended is due to these facts:

They answer at once any question about any kind of a pump or a steam

engine that the author could think of or had ever had asked him; are

absolutely scientifically correct; practically useful; written in a

clear, plain, popular style; up to date; free from hard words and

mathematical formulas. Each question is asked by itself and answered

in full by itself, thus saving the reader the necessity of wading

through a whole book when he only wants to know one thing, but wants

to know that right away. The books are plainly printed, liberally

illustrated, of a convenient size for the pocket, bound strongly to

stand use, and in dark cloth not to show the dirt; are on hard paper

to stand thumbing; handy for instant reference; liberally indexed

and cross indexed; and explanations are concise, yet very complete.

Their author is a favorite writer for the scientific papers; is known

to be careful, competent, original, practical, abreast of the times,

and able to tell what he knows. They can be drawn on for examination

questions by examining engineers who are handling candidates for

license, and by examination committees testing candidates for

admission to engineering societies. They can be used to coach for

examinations by those about to be examined for license, or for

admission to engineering societies. They enable competent engineers

to improve themselves; help green men out of scrapes without

mortification or exposure; prevent accidents and hasten repairs;

enable an employer to test a candidate for a job, thus preventing

his being imposed upon; and can be used to settle disputes between

engineers, as to the topics of which they treat. They describe the

construction and operation of every kind of pump; tell how to set

up, connect, adjust and start every principal pump in the market,

supposing all the parts to have been separated and laid on the floor.

Most of the matter is copyrighted, and can be found nowhere else.

In case of any trouble, they save delay in sending for, or writing

to, the maker or agent of the engine or pump. They are marvelously

cheap and have long been needed. If there are any practical questions

in the lines of which they treat which is not answered in the

latest editions, the author answers such questions free by mail,

and embodies such question and answer in subsequent editions or

volumes. The advantages of this feature, which is original with the

author of these popular books, and (up to date) exclusive, cannot be

overestimated.”

Fifty years hence: or, What may be in 1943 A prophecy supposed to be based on scientific deductions by an improved graphical method · 第 13 / 18 题