. The Philosophical magazine; a journal of theoretical, experimental and applied physics . is therefore suited for somewhat rough usage. Asregards the graduation of the instrument, the author observes thatwithin certain limits it may be rationally divided; and he has giventhe results of these investigations in the form of a table, and ex-plained it by a diagram. If the iron core is drawn to h or ^ of itswhole length within the spiral, one observation is sufficient for thegraduation within these limits, to deduce the other current-strengthsin respect of the pull they exert j for, according to t
. The Philosophical magazine; a journal of theoretical, experimental and applied physics . is therefore suited for somewhat rough usage. Asregards the graduation of the instrument, the author observes thatwithin certain limits it may be rationally divided; and he has giventhe results of these investigations in the form of a table, and ex-plained it by a diagram. If the iron core is drawn to h or ^ of itswhole length within the spiral, one observation is sufficient for thegraduation within these limits, to deduce the other current-strengthsin respect of the pull they exert j for, according to the above inves-tigation, the latter is proportional to the square of the current-strength, and moreover increases by about 2 per cent, for eachcentimetre of the rising or sinking core.—Cent,- ilblatt f. Electro-technik, v. p. 620; Beiblatter dor Physik, viii. p. 48. * In this reasoning there is not taken intoaeeount the fact that in thesevery constrained movements, as in solids or in very dense gases, besidethe vibrations of high there must also be those of low refrangibility. ?:.. Fig. •> Fi£. 3
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