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the centre of the table on which it rests ; at its base it rests on two rollers, 
and its apex swings on a vertical pivot. When, therefore, the microscope 
and lamp are placed on this u rotating table ” and adjusted to each other, 
the two may be sent round from one observer to another, as in a roulette- 
board. The pivot being movable, the rotating table can be made of any 
radius, and can then be adapted to the size of the loo-table on which it is 
placed. Amateur microscopists will do well to provide themselves with 
this little addition to the list of microscope accessories. 
A Telescopic Lamp . — A microscope lamp, which may be found convenient, 
has been constructed by Messrs. Murray and Heath, of Jermyn Street. In 
the form of the lamp itself there is little new ; but the stand is peculiar. 
It consists of three telescopic sliding tubes, the innermost of which is the 
cylinder which contains the oil. The object of this arrangement is that, 
without the ordinary contrivances, the light may be elevated or depressed. 
The tubes are provided with a screw-thread which prevents the lamp from 
descending from the point at which it is fixed. 
