On the History of Gunter's Scale and the Slide Rule During the Seventeenth CenturyCajori, Florian
History
On the History of Gunter's Scale and the Slide Rule During the Seventeenth Century
Cajori, Florian
Slide-rule
“Shortly after my gift to Elias Allen, I chanced to meet with Richard
Delamain in the street (it was at Alhallontide) and as we walked together
I told him what an Instrument I had given to Master Allen, both of the
Logarithmes projected into circles, which being lesse then one foot
diameter would performe as much as one of Master Gunters Rulers of sixe
feet long: and also of the Prostaphaereses of the Plannets and second
motions. Such an invention have I said he: for now his intentions (that
is his ambition) beganne to worke: . . . But he saith, Then after my
comming home I sent him a sight of my projection drawne in past-board.
See how notoriously he jugleth without an Instrument. Then after: how
long after? a sight of my projection: of how much? More then seven weekes
after on December 23, he sent to mee the line of numbers onely set upon a
circle: . . . and so much onely he presented to his Majesty: but as for
Sine or tangent of his, there was not the least shew of any. Neither
could he give to Master Allen any direction for the composure of the
circles of his Ring, or for the division of them: as upon his oath Master
Allen will testify how hee misled him, and made him labour in vain above
three weeks together, until Master Allen himselfe found out his ignorance
and mistaking, which is more cleare then is possible with any impudence
to be outfaced.”
Oughtred makes a further statement (Epistle, p. (24)) as follows:
Delamain hearing that Brown with his Serpentine had another line by which
he could worke to minutes in the 90 degree of sines . . . gave the [his]
booke to Browne: who in thankfulnesse could not but gratify Delamain with
his Lines also: and teach him the use of them, but especially of the
great Line: with this caution on both sides, that one should not meddle
with the others invention. Two dayes after Delamain . . . because he had
found some things to be altered therin, . . . asked for the booke . . .
but as soone as he had got it in his hands he rent out all the middle
part with the two Schemes & put them up in his pocket & went his way . .
. and . . . laboureth to recall all the bookes he had given forth . . .
And shortly after this he got a new Printer (who was ignorant of his
former Schemes) to print him new: giving him an especiall charge of the
outermost line newly graven in the Plate, which indeed is Brownes very
line: and then altering his book . . .
Public-domain text, read in full here on John Shaqi.
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