No. 54 673. 



Technical Polarisation Apparatus. 



561 



54 670, 54 684. 1 : 6. 



54 672. 1 = 6. 



diffraction experiments under No. 54,540; s. d. 

 the set there mentioned comprises a com- 

 plete and independent bench. As to the 

 employment of device No. 54,668 with a 

 small Paalzow Bench, see remark under 

 No. 54,635. 



54.523. Interference Mirror after Fresnel, 

 Fig: 54,523, p. 545, with parallel micro- 

 meter motion, micrometer screw with 

 drum and graduation, on stand, carefully 

 constructed 7. 0. 



54.524. i d e in, without parallel micro- 

 meter motion 4. 16. 



54,669. Complete Installation for setting up the 



Diffraction Chromoscope on the Paalzow s. d. 



Optical Bench, fitting the large Optical 



Bench No. 54,634 or the small bench 



No. 54,635 with extension. Given in are 



6 image plates with, grating images after 



Wood, size of images about 6.5 cm . . 8. 0. 



The outfit comprises 1 screening fold- 

 ing box with one simple gap, 1 photo holder 

 with change frame, 1 bi-convex lens, 1 gap 

 adjustable as regards height and width 

 and 1 achromatic objective with up-and- 

 down adjustment. 



Further details as to the Diffraction Chromoscope given 

 on p. 185, No. 51,066. 



Polarisation Apparatus for Technical Purposes. 



(Polariscopes.) 



54,670. Polarisation Apparatus with Divided Circle, after Mitscherlich, Figure, with 

 Laurent Polariser, for urine analyses, reading accurately to 0.1, with observing tube 

 1.4 inni and one tube 94.7 mm long, without sodium lamp ........ ... 



s. d. 



8. 5,0 



By using the 189.4 mm long tube the angle of rotation in degrees gives direct the amount in 

 grammes of dextrose contained in 100 com of the urine investigated. With rotations of more than 

 5 the sodium light must be purified by a light filter filled with potassium bicliromate solution (see 

 next item). For gas sodium lamp see No. 54 684. 







.54.<i71. Absorption Vessel for Potassium Bichromate Solution, for screwing in the end of the apparatus opposite 

 the source of light ...................................... 



54.672. Simple Polarisation Apparatus with Divided Circle, after Lippich, Figure, mounted 

 on pillar with tripod, with two verniers and magnifiers; also with Lippich Polariser in 

 two parts and absorption vessel and containing box ; for tubes to 220 mm length, without 

 observing tubes (see Nos. 54,677/81) ...................... 



54.673. idem, for tubes to 400 mm length, without observing tubes (see Nos. 54,677/82) 



If specially desired, apparatus Nos. 54,672 and 54,673 can also be fitted with a second graduation 

 in Ventzke degrees, this graduation rendering it possible to read the percentage dextrose direct. Fill inn 

 this second graduation costs ................................. 



If a Lippich Polariser with tripartite field of view is desired in these apparatus, the price of the 

 latter is increased by ..................................... 



The half-shadow can be varied within the limits 20 and read off on a small scale. 



Cl. 1632. 1633. 



0. 10. 



23. 5.0 



26. 10.0 



2. 19. 



5. 10. 



36 



