Hand spectroscope

Dr. Caroline Emilie Bleeker, Bleeker, Zeist
Stainless steel hand spectroscope (length 11,5 cm) with an adjustable eyepiece on one side and an adjustable slit on the other side. On the block a drum with the wavelength scale on it with a division in intervals of 10nm, starting at 435 nm to 750 nm. By turning the knurled knob on the side of the instrument, the spectrum moves across the field of view while the bright line remains fixed. In its original box. Signed "BLEEKER” ZEIST HOLLAND | N° 63913", Ca. 1970.
Newer version of Nedoptifa, Utrecht model This spectroscope is equipped with a new prism, and setting the split is also made easier with the help of an extra transfer button. The spectroscope is 11.5 cm long, which is ½ cm more than the previous version and also weighs 60 grams more.

private collection