147

Robt. W. Paul, New Southgate, London, N., and 33, Leicester

Square, London, W.C.

Unipivot Galvanometers and Measuring Instruments.

A series of moving coil portable instruments of unique design, by which a sensitivity is attained exceeding by some hundreds of times that of similar instruments of ordinary construction. They are characterised by the use of only one pivot, which supports the moving system (Fig. 1).

FIG. 1.

The spherical iron core between the poles of the permanent magnet has a hole down to its centre, at which is a jewelled cup in which the pivot, fixed on a short vertical axis, rests. The moving part is thus supported at its centre of gravity, so that the levelling is of little importance.

The use of only one pivot reduces the friction so much that portable instruments reading to less than one-millionth of an ampere are available.

A working model, four times the actual size of the instruments, is shown.

A number of these instruments are shown adapted for special purposes, their unusual sensitivity enabling measurements to be made with a portable instrument which were previously impossible.

K 2

---

Le texte affiché peut comporter un certain nombre d'erreurs. En effet, le mode texte de ce document a été généré de façon automatique par un programme de reconnaissance optique de caractères (OCR). Le taux de reconnaissance estimé pour cette page est de 99,74 %.

La langue de reconnaissance de l'OCR est l'Anglais.

---