crescograph

plural crescographs

1. A device for measuring growth in plants.

   For the detection of variation of growth it was necessary to devise the extremely sensitive balanced crescograph.

   1920 February 28, Scientific American Monthly, page 120

   2 more examples

   The magnetic crescograph, invented by the famed Indian botanist, Sir Jagadish Chandra Bose, for this purpose, seems capable of magnifying the highest powers of the microscope a hundred thousand times.

   1920, Edward Jewitt Wheeler, “Are plant life and animal life essentially the same?”, in Current Opinion, volume 69, page 828

   His various "crescographs," or growth recorders, have steadily increased in sensitiveness, until in the latest, the magnetic crescograph, we have an instrument which magnifies the movement ten million times.

   1936, J.C. Squire, The London Mercury, volume 33, page 511