partnership, including the widow, dating from 1866. Mooij (1988),
11*1.13.
599
600 READING TELESCOPES (357,358) 1865
Signed: Steinheil in Miinchen N° 2396 [358]; N° 2445 [35ItM
Overall length (tube closed) 350; height 250
Two identical reading telescopes, which -are used in Jljioratories to view
scales at a distance. The achromatic objectives have-apertures of 3§. The
tripod bases have levelling screws. The optical tubes are supported in
trunnions, with clamping screws. Focusing is by raekwork. The eyepiece
cross-wires are broken. Additionally, there are two high-power
eyepieces and one of normal power. The Steinheil invoice of 20 May
1865 addressed to Van der Willigen at Deventer is for these two telescopes
priced at 99 fe. each (=Dfl. 102). Two extra oculars G^^al 2 fe.
The firm ip Carl August Steinheil (180!i-Tif'0) was established by
1854. Continued by the sons and a grandson through the century. Frick
(1907), pt 2, 1463, fig. 2752; Brachner (1985), 150.
601 READING TELESCOPE (359) 1865
Signed: Steinheil in Miinchen N° 2645
Overall length 223; overall height 205; aperture 2 ^H
A laboratory reading telescope of a similar type to those described above
(600). The right-angled prism makes use easier when observing scales
with the telescope horizontal. The invoice of 25 August 1865,
addressed to Van der Willigen at Haarlem, is for 92 fe. (=Dfl. 93.85),
including two oculars.
601
602 READING TELESCOPE (1072) 1913
Signed on barrel J. VAN WAVEREN JR FEC. A° 1913.
Radius of foot 230; tube length 584, diameter 75; overall
height 470
Jilles van Waveren was the eldest son of the amanuensis to the Physical
Laboratory in Teyler’s Museum. At the time he made this telescope he
was an assistant to his father. The objective was originally on the
Repsold universal instrument (Ven (1898), no. 362), and was ground
and polished anew by Merz, Munich.