Ni>. S4 379. 



Camera obscura, Camera lucida. Magnifying Glasses. Microscope. Telescope. 



531 



54 374. 1 : 6. 



54 371. 1 = 4. 



54 372. 1 : 4. 



54 379. 1 : 8. 



54.366. Model of the Compound Microscope, Figure, constructed open, on wood base, the 8. d. 

 path of ray being indicated 0. 15. 



54.367. Model of the Galilean Telescope, Figure, constructed open 0. 8. 



54.368. Model of the Astronomical Telescope, Figure, constructed open 0. 10. 



54.369. Model of the Terrestrial Telescope, Figure, constructed open . 0. 16. 



54.370. Model of Newton's Reflecting Telescope, Figure 0.18.0 



54.371. Model of the Brachio-Telescope, Figure, constructed open 1. 0. 



54.372. Model of a Meridian Circle, of wood, Figure, with metal circle and indices, dia- 

 meter of circles 120 mm 2. 14. 



54.373. - - idem, of metal 5. 8. 



54.374. Small Weinhold Optical Bench, Figure, for Explaining the Microscope, the Astro- 

 nomical, Terrestrial and Galilean Telescopes, on pillar base; lenses 20 mm diameter, 

 objective 70 mm; all lenses mounted in metal (W. D. Fig. 317 [300]) 1. 6. 



Perforated Cylindrical Pillar: see Nos. 53,688 and 53,689; Gas Burner: see No. 53,681a; Paraffin Burner: see 

 No. 53,684a; Ligroin Lamps: see No. 54,375. 



">4. :;;.">. 3 Ligroin Lamps, arranged close together (W. D. p. 440), cf. Fig. 53,626 0. 6. 



54.376. Optical Bench as No. 54,374, without pillar, on two short legs 1. 2. 



54.377. --idem, on pillar base, but with larger lenses (40 mm) and an objective 120 mm 

 diameter 2. 0. 



54.378. Small Mirror on Stand and Total Reflection Prism on Sliding Blocks, for demonstrating the Herschel 

 Telescope and the Newton Reflecting Telescope; for use with Optical Bench No. 54,374 or 54,377 



(W. D. Fig. 320A and B [302A and B]) 0. 16. 



54,370. Small Optical Bench with Glass Box, Figure, for demonstrating the path of nivs 

 in. lenses, telescopes of different systems and in microscopes, with 11 lenses and 5 dia- 

 phragms 7. 0. 



Cl. 4528, 1522, 



1521, 5316. 34* 



