3 cos ([theta] / 3) = 1 + [root](4 - sin^2[theta])

which is certainly false.[34]

{14}

In 1852 I examined a terrific construction, at the request of the late Dr.

Wallich,[35] who was anxious to persuade a poor countryman of his, that

trisection of the angle was waste of time. One of the principles was, that

"magnitude and direction determine each other." The construction was

equivalent to the assertion that, [theta] being any angle, the cosine of

its third part is

sin 3[theta] . cos(5[theta]/2) + sin^2 [theta] sin (5[theta]/2)

divided by the square root of

sin^2 3[theta] . cos^2 (5[theta]/2) + sin^4 [theta] + sin 3[theta] . sin

5[theta] . sin^2 [theta].

This is from my rough notes, and I believe it is correct.[36] It is so

nearly true, unless the angle be very obtuse, that common drawing, applied

to the construction, will not detect the error. There are many formulae of

this kind: and I have several times found a speculator who has discovered

the corresponding construction, has seen the approximate success of his

drawing--often as great as absolute truth could give in graphical

practice,--and has then set about his demonstration, in which he always

succeeds to his own content.

There is a trisection of which I have lost both cutting and reference: I

think it is in the _United Service Journal_. I could not detect any error

in it, though certain there must {15} be one. At least I discovered that

two parts of the diagram were incompatible unless a certain point lay in

line with two others, by which the angle to be trisected--and which was

trisected--was bound to be either 0 deg. or 180 deg..

Aug. 22, 1866. Mr. Upton sticks to his subject. He has just published "The

Uptonian Trisection. Respectfully dedicated to the schoolmasters of the

United Kingdom." It seems to be a new attempt. He takes no notice of the

sentence I have put in italics: nor does he mention my notice of him,

unless he means to include me among those by whom he has been "ridiculed

and sneered at" or "branded as a brainless heretic." I did neither one nor

the other: I thought Mr. Upton a paradoxer to whom it was likely to be

worth while to propound the definite assertion now in italics; and Mr.

Upton does not find it convenient to take issue on the point. He prefers

general assertions about algebra. So long as he cannot meet algebra on the

above question, he may issue as many "respectful challenges" to the

mathematicians as he can find paper to write: he will meet with no

attention.

There is one trisection which is of more importance than that of the angle.

It is easy to get half the paper on which you write for margin; or a

quarter; but very troublesome to get a third. Show us how, easily and

certainly, to fold the paper into three, and you will be a real benefactor

to society.

Early in the century there was a Turkish trisector of the angle, Hussein

Effendi, who published two methods. He was the father of Ameen Bey, who was

well known in England thirty years ago as a most amiable and cultivated

gentleman and an excellent mathematician. He was then a student at

Cambridge; and he died, years ago, in command of the army in Syria. Hussein

Effendi was instructed in mathematics by Ingliz Selim Effendi, who

translated a work {16} of Bonnycastle[37] into Turkish.[38] This Englishman

was Richard Baily, brother of Francis Baily[39] the astronomer, who

emigrated to Turkey in his youth, and adopted the manners of the Turks, but

whether their religion also I never heard, though I should suppose he did.

I now give the letters from the agricultural laborer and his friend,

described on page 12, Vol. I. They are curiosities; and the history of the

quadrature can never be well written without some specimens of this kind:

"Doctor Morgan, Sir. Permit me to address you

"Brute Creation may perhaps enjoy the faculty of beholding visible things

with a more penitrating eye than ourselves. But Spiritual objects are as

far out of their reach as though they had no being

"Nearest therefore to the brute Creation are those men who Suppose

themselves to be so far governed by external objects as to believe nothing

but what they See and feel And Can accomedate to their Shallow

understanding and Imaginations

"My Dear Sir Let us all Consult ourselves by the wise proverb.

"I believe that evry man^s merit & ability aught to be appreciated and

valued In proportion to its worth & utility

"In whatever State or Circumstances they may fortunately or unfortunately

be placed

"And happy it is for evry man to know his worth and place

"When a Gentleman of your Standing in Society Clad with those honors Can

not understand or Solve a problem That is explicitly explained by words and

Letters and {17} mathematically operated by figuers He had best consult the

wise proverd

"Do that which thou Canst understand and Comprehend for thy good.

"I would recommend that Such Gentleman Change his business

"And appropriate his time and attention to a Sunday School to Learn what he

Could and keep the Litle Children form durting their Close

"With Sincere feelings of Gratitude for your weakness and Inability I am

"Sir your Superior in Mathematics ----"

"1849 June th29."

"Dor Morgin Sir

"I wrote and Sent my work to Professor ---- of ---- State of ---- United

States

"I am now in the possession of the facts that he highly approves of my

work. And Says he will Insure me Reward in the States

"I write this that you may understand that I have knowledge of the unfair

way that I am treated In my own nati County

"I am told and have reasons to believe that it is the Clergy that treat me

so unjust.

"I am not Desirous of heaping Disonors upon my own nation. But if I have to

Leave this kingdom without my Just dues. The world Shall know how I am and

have been treated.

"I am Sir Desirous of my

"Just dues ----"

"1849 July 3."

"July 7th, 1849.

"Sir, I have been given to understand that a friend of mine one whom I

shall never be ashamed to acknowledge as {18} such tho' lowly his origine;

nay not only not ashamed but proud of doing so for I am one of those who

esteem and respect a man according to his ability and probity, deeming with

Dr. Watts 'that the mind is the standard of the man,'[40] has laid before

you and asked your opinion of his extraordinary performance, viz. the

quadrature of the circle, he did this with the firmest belief that you

would not only treat the matter in a straightforward manner but with the

conviction that from your known or supposed knowledge of mathematicks would

have given an upright and honorable decision upon the subject; but the

question is have you done so? Could I say yes I would with the greatest of

pleasure and have congratulated you upon your decision whatever it might

have been but I am sorry to say that I cannot your letter is a paltry

evasion, you say 'that it is a great pity that you (Mr. ----) should have

attempted this (the quadrature of the circle) for your mathematical

knowledge is not sufficient to make you know in what the problem consists,'

you don't say in what it does consist _according to your ideas_, oh! no

nothing of the sort, you enter into no disquisition upon the subject in

order to show where you think Mr. ---- is wrong and why you have not is

simply--_because you cannot_--you know that he has done it and what is if I

am not wrongly informed _you have been heard to say so_. He has done what

you nor any other mathematician as those who call themselves such have

done. And what is the reason that you will not candidly acknowledge to him

as you have to others that he has squared the circle shall I tell you? it

is because he has performed the feat to obtain the glory of which

mathematicians have battled from time immemorial that they might encircle

their brows with a wreath of laurels far more glorious than ever conqueror

won it is simply this that it is a poor man a {19} humble artisan who has

gained that victory that you don't like to acknowledge it you don't like to

be beaten and worse to acknowledge that you have miscalculated, you have in

short too small a soul to acknowledge that he is right.

"I was asked my opinion and _I_ gave it unhesitatingly in the affirmative

and I am backed in my opinion not only by Mr. ---- a mathematician and

watchmaker residing in the boro of Southwark but by no less an authority

than the Professor of mathematics of ---- College ---- ---- United States

Mr. ---- and I presume that he at least is your equal as an authority and

Mr. ---- says that the government of the U.S. will recompense M. D. for the

discovery he has made if so what a reflection upon Old england the boasted

land of freedom the nursery of arts and sciences that her sons are obliged

to go to a foreign country to obtain that recompense to which they are

justly entitled

"In conclusion I had to contradict an assertion you made to the effect that

'there is not nor ever was any reward offered by the government of this

country for the discovery of the quadrature of the circle.' I beg to inform

you that there _was_ but that it having been deemed an impossibility the

government has withdrawn it. I do this upon no less an authority than the

Marquis of Northampton.[41]

"I am, sir, yours ----"

"Dr. Morgan."

A Budget of Paradoxes, Volume II · 第 16 / 123 题