& s. d. Codeword

No.

153.

154,

155.

156.

157.

158.

Micrometer Eyepiece with intermediate screw-fitting containing the micrometer scale. The eyelens is contained in a sliding mount and can be accurately adjusted to suit the observers’s sight...........................................0.10. 0 Mierolite

Any of the Huyghenian Eyepieces Nos. 0 to IV may be arranged for use as a micrometer eyepiece. In the absence of an expressly stated requirement to the contrary we invariably supply the micromter fitted to Eyepiece No II.

Step Micrometer Eyepiece*). In this mi-

Ernst Leitz crometer the intervals are arranged in groups Wetzlar. „ , , . ......

of ten, each group being indicated in an unmistakable manner by a black echelon rising from the first to the tenth interval. This arrangement possesses the great ad-L10 vantage that the divisions can always be seen distinctly whether the objects be light or comparatively dark.

The intervals of the scale, instead of being Vio or Yso mm wide, as is usually the case

100-B

in eye piece mircrometers, have a definite value of 0.06 mm. The object of this departure 00 is to obtain for each objective and for a |170 given tube length convenient, and in the majority of cases integral, micrometer values, which greatly facilitates the use of the instru-90 ment. The actual tube length differs in most 100 cases but little from the standard length.

Each Step Micrometer is supplied with a Table of Micrometer Constants and corresponding Tube Lengths computed for the meter No1Ci54.Huyghenian Eyepiece No. II and each of the

Leitz Objectives..........................0.15. 0 Mierometro

Glass Eyepiece Micrometer, to place on the eyepiece

diaphragm, the scale being 5 mm divided into 100 parts 0. 6. 0 Mierologo

Glass Eyepiece Micrometer, scale of 10 mm divided

into 100 parts.......................................0. 5. 0 Micrometer

Eyepiece Micrometer divided into squares for counting scattered objects in the field, the intervals between the

lines being 0,5 mm...................................0. 5. 0 Mieroporos

Large Screw Stage Micrometer to rest on the stage of the microscope stand. With divided drum reading to 0,002 mm..........................................6. 0. 0 Mieronisus

*) Cf. C. Metz. ’’The step Micrometer with Simplified Micrometer Scale". Translated reprint from the Zeitschrift fur wissenschaftliche Mikros-kopie, XXIX, 10.12, pp. 72—79.

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