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1887 Amer. Naturalist 21 297 The embryoscope devised by Hartnack represents an improved form of the drawing apparatus introduced by Professor His.

1898 Tit-Bits 23 Apr. 69/1 It was discovered by a German physiologist by the use of an embryoscope, or egg-glass, that the shells of eggs were of very unequal thickness.

1995 J. C. Anderson in R. J. Trent Handbk. Prenatal Diagnosis iv. 76 Advances in fibre optics have made the visualization of the first-trimester fetus possible using ‘embryoscopes’ as small as 1.7 mm in diameter.

2012 Liverpool Echo 17 Sept. 9 Three years ago, the embryoscope was developed which took a series of pictures every 20 minutes of the way the embryo was developing, but it still needed humans to decide which embryo was best for implant.