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of the imperial yard, for the Toise employed by M. Bessel, the general size of the apparatus would be reduced to a more con venient dimension, and the diminished length of the longer pendulum would cause the coincidences with it to be observed. with greater facility and increased accuracy.

"

Were this the proper occasion, some other modifications which have suggested themselves in M. Bessel's apparatus might be pointed out; but, by so doing, this paper would be extended to an inconvenient length. I shall confine myself, therefore, to noticing that the vacuum apparatus will probably prove a useful auxiliary in M. Bessel's method, as well as in Captain Kater's; by furnishing, in the most satisfactory manner, for the experimental pendulums of that apparatus, the amount of the retardation occasioned by the medium in which the vibration takes place.

EDWARD SABINE,

nommen On a New Mode of Secret Writing. DRICHARD PENN, Esq.

62

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of the imperial yard,' for the Toise employed by M. Bessel, the general size of the apparatus would be reduced to a more con venient dimension, and the diminished length of the longer pendulum would cause the coincidences with it to be observed with greater facility and increased accuracy.

Were this the proper occasion, some other modifications which have suggested themselves in M, Bessel's apparatus might be pointed out; but, by so doing, this paper would be extended to an inconvenient length. I shall confine myself, therefore, to noticing that the vacuum apparatus will probably prove a useful auxiliary in M. Bessel's method, as well as in Captain Kater's; by furnishing, in the most satisfactory manner, for the experimental pendulums of that apparatus, the amount of the retardation occasioned by the medium in which the vibration takes place.

EDWARD SABINE,

On a New Mode of Secret Writing.
By RICHARD PEnn, Esq.

THE articles on the subject of Secret Writing which appeared some years ago in the Quarterly Journal of Science, induced me at that time to complete the arrangement of a cipher, founded on a principle which I had long before intended to apply to that object.

As the talent and perseverance of the decipherer have very frequently overcome all the difficulties which skill and ingenuity have opposed to the success of his labours, it may seem presumptuous that I should venture to challenge any person to unravel the intricacies which are supposed by me to belong to a cipher of my own construction. There are, however, many observations in the articles above referred to, which make me less diffident than I should otherwise have been as to the merits of the present plan, and confidently persuade me that it will be found to possess many advantages which do not appear to have been hitherto combined.

* Vol. x. p. 89, 90, 91, 101.-Vol. xii. p. 21, 29, 292, 293.

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of the imperial yard, for the Toise employed by M. Bessel, the general size of the apparatus would be reduced to a more con venient dimension, and the diminished length of the longer pendulum would cause the coincidences with it to be observed with greater facility and increased accuracy.

Were this the proper occasion, some other modifications which have suggested themselves in M, Bessel's apparatus might be pointed out; but, by so doing, this paper would be extended to an inconvenient length. I shall confine myself,

therefore, to noticing that the vacuum apparatus will probably prove a useful auxiliary in M. Bessel's method, as well as in Captain Kater's; by furnishing, in the most satisfactory manner, for the experimental pendulums of that apparatus, the amount of the retardation occasioned by the medium in which the vibration takes place.

EDWARD SABINE,

On a New Mode of Secret Writing.
By RICHARD PENN, Esq.

THE articles on the subject of Secret Writing which appeared some years ago in the Quarterly Journal of Science, induced me at that time to complete the arrangement of a cipher, founded on a principle which I had long before intended to apply to that object.

As the talent and perseverance of the decipherer have very frequently overcome all the difficulties which skill and ingenuity have opposed to the success of his labours, it may seem presumptuous that I should venture to challenge any person to unravel the intricacies which are supposed by me to belong to a cipher of my own construction. There are, however, many observations in the articles above referred to, which make me less diffident than I should otherwise have been as to the merits of the present plan, and confidently persuade me that it will be found to possess many advantages which do not appear to have been hitherto combined.

* Vol. x. p. 89, 90, 91, 101.-Vol. xii. p. 21, 29, 292, 293.

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