No. M IM. 



Reading Microscopes, Longitudinal Dividing Engines. 



227 



51478. 1:8. 



51 480. 1 : 7. 



51.476. Reading Device for Thermometers, Burettes, etc. from 6 20 mm diameter, Figs. A 

 and B, comprising stand with locking frame, mirror inserted for mirror readings 

 and glow lamp inserted for illuminating 



The glow lamp is supplied for 2, 4 or 6 volts; if voltage is not stated when ordering, a 4 volt 

 lamp is supplied. 



51.477. Magnifying Glass with Cross Wires, for high magnification (cf. Fig. 51,476 B) . . 



51.478. Dividing Engine for lengths to 500 mm, carefully and massively constructed, 

 Figure, with screw of 1 mm pitch, arrangement on the drawing mechanism for 

 drawing the 5 ths and 10 lh8 longer, and with reading microscope 



The illustration does not now represent the drawing mechanism, this having been considerably 

 improved. 



51.479. - - idem, without reading microscope 



51.480. Longitudinal Dividing Engine for fine and coarse graduation, Figure, for lengths 

 to 350 mm, total length of machine 850 mm (Fr. phys. Techn. I, 1, Fig. 1963) . . 



This machine divides accurately to l / la> mm by means of a dividing wheel and a screw with milli- 

 metre pitch; the drawing mechanism rests firmly on the powerful cheeks and permits of the mechanical 

 drawing of graduations of various lengths. For reading microscope for this engine, see No. 51,481. 



51.481. Reading Microscope with adjustable wires, on a slider fitting the machine . Each 



s. d. 

 0.13.0 



0. 8.0 

 25. 0.0 



22.10.0 

 32.10.0 



7.10.0 



Cl. 3773, 

 3623. 



15" 



