RECOMMENDATIONS,

From H. A. NEWTON,

Prof. of Mathematics, Yale College.

The METER-DIAGRAM of the Messrs. STANLEY exhibits in an
effective manner the whole Metric System, and especially the relation
of feet and inches to meters and millimeters. To school committees
and teachers I most heartily commend it, as most useful upon the
walls of the school room. Moreover, I know of no easier way by
which anybody desirous of learning the system can do it, than by
studying this little, and by keeping it in a place where he will
repeatedly see it.

H. A. NEWTON.

Yale College, Feb. 24, 1870.

SHEFFIELD SCIENTIFIC SCHOOL OF YALE
COLLEGE.

New Haven, Connecticut, March 7th, 1870.

I quite agree with Prof. Newton in his commendation of the
METER-DIAGRAM. No other comparative view of the Metric and
English systems that I have ever seen, is so complete and satisfactory.
With its yard and Meter scales side by side, so convenient to measure
with as well as study, and its tables of comparison, so indispensable
for reference, it must prove highly useful to all classes of people, and
aid materially in familiarizing them with a system of weights and
measures which is likely, at no distant day, to supplant that of
England and the United States, as it has already done, on its rapidly
doing, those of other countries.

C. S. LYMAN,

Prof. of Astronomy and Physics.

From Hon. B. G. NORTHROP,

Secretary of Board of Education, State of Conn.

Messrs. A. & T. W. STANLEY:
Your Metric Diagram will greatly facilitate the mastery of the
Metric System. Giving in one comparative view the exact relation
of the inch, foot, and yard, to the centimeter, decimeter, and meter,
it makes these linear measurements plain and simple even to young
pupils. I have long advocated the importance of placing the common
measures in the hands of pupils or placing them in the school room
for the eyes of all, and also urged that the rules thus used, whether
in favor of feet or of meters, should be metrically marked on one side
or the other, and in inches and feet on the other.
By the advance of civilization, and by the closer relations of growing
intercourse which commerce is creating throughout the world, the
Metric System is likely to become universal. Certainly after this
centennial year, and with the lessons learned at the international
exposition at Philadelphia, the youth of America ought no longer to
be ignorant of that system which is already in use by one-half the
cultivated nations of the world, and which, computing only by
decimals, is of all others the most simple and uniform. The cheapness
and excellence of your Meter-Diagram favor its general use. I
should be glad to see it in every school in Connecticut.

B. G. NORTHROP.

New Haven, March 7th, 1870.

The METER-DIAGRAM is the name of a device designed and published by Messrs. Augustus and T. W. Stanley of this city, and is of great interest and value. It consists of a yard measure, subdivided into feet, inches, and fractions, printed alongside of a Meter which is also subdivided into decimeters, centimeters, and millimeters. It affords a most effective manner of comparing our system of measure with the Metric System, and shows at a glance the relations of feet and inches to meters and fractions. The diagram has also all the tables of the Metric System, and valuable explanatory notes. It is printed on heavy card board, faced with linen. It is designed more particularly for use in schools, but will be found valuable to all who have curiosity or interest in the system of measures which is so fast growing into favor and practical use. It is highly commended by many scientific gentlemen who have seen it, and will soon be placed for sale with all the leading booksellers and stationers. - A. S. Prier.

From Prof. I. N. CARLETON,

Principal Conn. Nat. and Univ. Schs.

It is a demand of the times that every intelligent mechanic, and teacher should understand the "Metric System." The METER DIAGRAM of the Messrs. Stanley is just the aid needed by one who would learn the System thoroughly and quickly, and it seems to me to be a most ingenious device in the way of such instruction. The Diagram is excellent in every respect, and is entered at so low a price as to be within the reach of all.

I. N. CARLETON.

New Britain, March 10, 1876.

From Prof. WM. B. DWIGHT,

Associate Principal Conn. State Armid Sch.

For the purposes of instruction in the Metric System, the METER
DIAGRAM of Messrs. A. & T. W. Stanley has marked advantages of its
own. On a broad basis of the best end board invented on the
line, are printed with great neatness and accuracy the English Ordin,
linen, and the French Meter, with their respective subdivisions, sole in
the most convenient form for instant comparison at any point;
below these, are various tables of comparison, approximate equals
and rules for reduction from one system to the other.

As possessing the requisites for practical instruction on this subject,
in a more portable and accurate form than any thing else with which
I am acquainted, I heartily recommend its general use in our schools.

Wm. B. DWIGHT.

New Britain, Conn., March 11th, 1876.

From Prof. DAVID N. CAMP,

Principal, New Britain, Conn.

Messrs. A. & T. W. STANLEY:

Dear Sirs:-I have examined with great satisfaction the METER
DIAGRAM you publish. I find that it exhibits in a complete manner,
all the tables and denominations of the Metric System, and present
effectively to the eye the relation of feet and inches to meters and
pounds of meters. It will be a valuable auxiliary in teaching, of great
service both to teachers and pupils. -Yours respectively,
DAVID N. CAMP.

New Britain, March 10th, 1876.