[CH. I optical bench is desirable. This consists of an arrangementby means of which a series of stands carrying various piecesof optical apparatus, such as a photometer disc, a lens or amirror, can be made to slide backwards and forwards in astraight line. In most experiments the distances… … . 11. A number of rectangular blocks of wood can slide on awooden bar some 2 or 3 metres in length. The section of thebar is like an inverted T; a scale of centimetres, or if desirableof millimetres, is fitted to the bar. Two pieces of brass platebent to an F shape are screwed on to the under side…
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