walnut, and lined with green velvet (faded). It came to the Teyler’s
Museum in 1892 under the legacy of Dr Korthals.
Simon Plossl (1794-1868) was a famous instrument maker of
Vienna; Hôlzl (1969). A microscope of the same type is described and
figured in Hôlzl (1972), especially 175, fig. 1. Harting (1866), book III,
182-185, fig. 93.
591 MICROSCOPE: CAMERA LUCIDA 'fl071)after 1898
A split collar (diameter 27) of brass to fit over the eyepiece of a microscope
has mounted on a swivel pin a prism camera lucida used for drawing
microscopical images. Contained in card and paper box, 66 x 41 x
44. The design resembles that advertised by Carl Zeiss from 1869,
when first introduced. Described as: “Old form of Camera lucida” in
Zeiss catalogues of around 1900. Zeiss (1902),--87, noM09, fig. 46.
591
592 MICROSCOPIC WRITING (906) 1851
Signed: FROMENT PARIS
Glass slide (49 x 19) mounted in decorated paper, black/gold with
green rim, and kept in a card box. Although now crazed and cracked,
at centre may be read with a microscope the words: [E] cvit comme objet
microsopique / Froment cl Paris 1851. Purchased by Van Breda in 185?
for n'oWM
593 DIATOM PLATE (375) . 1870
A standard-sized glass microscope slide 75 x 25 (~ 3 x 1 inch) holds at
the centre an array of diatoms with the inscriptions at either side:
(on right) I.D. Möller Wedel in Holstein Germania 1870.
(on left) Diatomaceen = Typen - Platte Deckglasdicke 1/9 mm N° 186.
Case (97 x 43 x 15) of red leather and paper, lined in purple velvet with
white silk in lid. On a paper slip in the case is written: 400 stuks. On
lid of case is inscribed in gold-embossed letters: J.D. MOLLER’S DIA-
TOMACEEN-TYPEN-PLATTE. Also a printed catalogue of diatoms
signed J.D. Möller at Wedel ingllolstein, February 1870. An early
notice of a similar slide with 400 specimens, which cost £3, is in The
Journal o f the Quekett Microscopical Club for 1868; see Quekett (1868).
Johann Diedrich Möller ( ll|B l9 0 7 ) was known for his skill
in mounting very large numbers of different diatoms in a very small
area. These then served as a simple resolution test for microscope objectives.
For a biography and account of the making of diatom plates, see
Morrocks (1969).
594 MICROSCOPIC PREPARATIONS (381,382) 1867
381 Fifty zoologjbil preparations on standard-sized glass slides (3 x
1 inch). With printed list of preparations in German, and price
list for two different sizes of case, and fo®loth-covered or
paper-covered cases: respectively-: . Thlr. 16, 12, 13, 10.
Case measures 286 x 240 x 32.
382 Fifty zoological preparations as above; list in German and
French. Case 287 x 242 x 33.
The cases for both sets are similar, with two lift-out trays. They are covered
in embossed paper, gold trimmed, and lined with red velvet and
silk in lid. Purchased from P.J. Kipp en Zonen,Delft, in November
1867, for Dfl. 32 each set.