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BAROGRAPHS AND THERMOGRAPHS.
These Instruments, as shown in the illustrations, are most interesting to those who take note of atmospheric variations, as a complete record is given by a pen upon a printed chart for an entire week, and by its form the exact barometric reading can be seen at any moment, as well as the varying line traced by the pen for the time preceding. The charts also, which are changed at the commencement of each week, can be retained as a record for the entire year. Full descriptions and directions for use are supplied with each instrument.
No. J O 6143.
Plain Sheet Glass Cover, Fumed Oak or Polished Mahogany Frame, complete with supply of charts for one year, as illustration. Price £3 3 0
No. J O 6144. THERMOGRAPH.
This instrument is arranged and constructed for recording on a chart the maximum, minimum and varying changes of temperature which continually take place wherever it may be located. In Copper Case. Price £5 0 0
