Page:Carroll - Notes by an Oxford Chiel.djvu/57

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"Again, it is often impossible to carry on accurate Physical experiments in close contiguity to one another, owing to their mutual interference; and consequently different processes need different rooms, in which these delicate instruments, which are always required in a particular branch of science, have to be carefully and permanently fixed."


"It may be sufficient, in order to give an idea of the number of rooms required, to enumerate the chief branches of Physics which require special accommodation, owing to their mutual interference.

(1) Weighing and measuring.
(2) Heat.
(3) Radiant Heat.
(4) Dispersion of Light. Spectrum Analysis, &c.
(5) General optics.
(6) Statical electricity.
(7) Dynamical electricity.
(8) Magnetism.
(9) Acoustics.

Of these, (5) requires one large room or three smaller rooms, and these, together with those devoted to (3) and (4), should have a south aspect. Besides the fixed instruments, there is a large quantity of moveable apparatus, which is either used with them or employed in illustrating lectures; and this must be carefully preserved from causes of deterioration when not in use; for this purpose a large room fitted with glass cases is required. A store-room for chemicals and other materials used is also necessary."


"As Photography is now very much employed in multiplying results of observation, in constructing diagrams for lectures, &c., and as it is in fact a branch of Physics, a small Photographic room is necessary, both for general use and for studying the subject itself."