87 
No. 
57a 
*The same, ^Yith a set of diaphragms and an arrangement 
for placing and revolving the same above the objective, designed 
for objective aa 
58 
Bulls-eye Lens, lOO mm in diameter, on stand; in case 
Idem 80 mm 
Idem 60 mm 
59 Microscope Lamp. Gas lamp of special construction 
mounted on brass stand with vertical adjustment and combined 
with glass globe (No. 69") of about 1,50 mm (6") dia., which 
when filled with water or ammonio-cupric solution acts as a 
condenser. 
To obtain a proper illumination the gas flame should be about 
15 cm (6") behind the globe, and the mirror of the microscope the 
same distance in front of it with the most concentrated part of 
the cone of rays impinging on it. — The lamp gives an excellent 
bright and white light which almost completely supplies the place 
of good daylight 
59 
Glass Globe and wood-stand alone 
60 Hand Spectroscope (Pocket Spectroscope) after Browning, 
for observing the effect of absorption in larger objects — with 
adjustable slit and Amici prism of high dispersion. 
a) Without comparison prism 
b) With comparison prism 
