50 Jacob Merz, Miiuchen. 



The instrument is fitted with clock work (which may be correct- 

 ed for stellar and solar time). It is supplied with 7 astronomical 

 oculars (5 Huyghenian, 2 erecting) magnifying 26, 39, 88, 99, 132, 

 198, 330 times. The magnification is capable of increase beyond 

 these figures. Cross line micrometer with fine measuring screw and 

 position circle divided on silver in 1 / i degrees, reading to minutes, 

 with field and cross line illumination, supplied with 6 micrometer 

 oculars magnifying 66 to 330 times. With the instrument are sup- 

 plied a helioscope and an universal spectroscope. 



The instrument being adjustable for either hemisphere and being 

 very portable is adapted for scientific purposes. 



2. Equatorial (Refractor) having an objective of 5 inches 

 diameter and a focus of 70 inches', provided with a finder having an 

 objective of iVa inch diameter and 11 inches focus, with erecting 

 ocular, magnifying 8 l /2 times. The instrument rests upon an iron 

 tripod fitted w r ith levelling screws and wheels and is adapted for a 

 high or low position and has also adjustable polar altitude of to 

 60. Eectascension and declination circles with divisions on brass, 

 the former reading to 10 minutes and reading by verniers 1 minute; 

 the latter divided in Vi degrees and reading by verniers to 5 minutes. 

 The instrument is provided with all coarse and fine adjustments and 

 also with azimuth adjustment without circle. The instrument is sup- 

 plied with 1 terrestrial ocular, magnifying 80 times and 6 astrono- 

 mical oculars (5 Huyghenian and 1 erecting ocular) magnifying 41, 

 93, 105, 140, 210, 350 times and capable of higher magnifications. 



If desired the following may be added: Micrometer with double 

 and single steel ring, helioscope and spectroscope. 



3. The following ten Objectives: 



1 objective of 11 inches effective aperture and 120 inches focus. 



1 9V 2 * , H7 



1 , 7 98 



4 ,,6 91,83,76,66 



3 ,,5 64, 60, 59 



Refractors and objectives of larger dimensions than those named 

 are made in the most exact manner to order. Beside these the esta- 

 blishment produces various other optical instruments. It exports to 

 all parts of the globe. 



