ERROR UPON ERROR.

The great inducement to Mr. Babbage, some years since, to attempt

the construction of a machine by which astronomical tables could be

calculated and even printed by mechanical means, and with entire

accuracy, was the errors in the requisite tables. Nineteen such

errors, in point of fact, were discovered in an edition of Taylor’s

_Logarithms_ printed in 1796; some of which might have led to the

most dangerous results in calculating a ship’s place. These nineteen

errors (of which one only was an error of the press) were pointed out

in the _Nautical Almanac_ for 1832. In one of these _errata_, the seat

of the error was stated to be in cosine of 14° 18′ 3″. Subsequent

examination showed that there was an error of one second in this

correction, and accordingly, in the _Nautical Almanac_ of the next

year a new correction was necessary. But in making the new correction

of one second, a new error was committed of ten degrees, making it

still necessary, in some future edition of the _Nautical Almanac_,

to insert an _erratum_ in an _erratum_ of the _errata_ in Taylor’s

_Logarithms_.--_Edinburgh Review_, vol. 59.

Phenomena of Heat.

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