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On other side:
A B 2/3 Engelse Yards in Agt deelen.
C D 2/3 Amsterdamse Ellen in Agt deelen.
The mahogany case (broken) measures 760 x 144 x 30. It is lined in
green baize (probably 19th century). Benjamin Ayres had a workshop
in Amsterdam during the middle of the 18th century; see Rooseboom
(1950), 26-27.
Ó J k a È fò d o o r
Or A N G E pi Æ iS S A XTd'c.Ár. fie
/le t <§c//&
W ^od/egfstC ' ta- .y / t /m i t i t / t / ì / / .
358
—-----1---— .. i—
m
358
359 STANDARD OF LENGTH
Unsigned
Standard: 1,000 x 29 x
■ 2/4 19th C.
359
Made in iron, this is a standard metre, divided in millimetres, and
stamped at one end: I METER. It is kept in a deal box, wrapped in
linen. The box measures 1,053 x 70 x 3 L r f
360 STANDARD OF LENGTH ~ (4 j[ 1856
Unsigned; made by H. Olland, Utrecht
Standard: 1,000 x 12.5 x 24.5
The metre, unusual in being made of glass, is defined by the flat tips of
the conical ends. The number 9 is scratched on the glass. It is contained
in a mahogany case with number 9 on the edge. A seal in red wax is
present, inscribed: KON[INKLI]JKE ACADEMIE VAN WETEN-
SCHAPPE[N], with crown and lion. It was sold, by the Academy, in
June 1869 to Teyler's along with the kilogram No. 1 (364), for Dfl.
150.
H. Olkmd||825-"1901) won a prize at a national exhibition
organized at Haarlem in 1861 by the Dutch Society for the
Advancement of Industry for his balances and meteorological instruments.
De Clercq (1985a), 217; Turner (1985), 233; Mooij (1988), 98.
360
361 CATHETOMETER (6) 1876
Signed: Perreaux h. Paris
Base radius 180; overall height 1,400; length of telescope 330
A cathetometer is a horizontally mounted telescope moving over a graduated
vertical support for measuring, at a distance, differences of heights.
In this example, the iron tripod has levelling screws and bubble level,
and supports a brass pillar which swivels over the base. The bracket
holding the telescope is on a dovetail, and the position can be locked
and then fine adjusted. The bracket has a level, and the telescope crosswires
and objective cap. Two other objectives are available. May have
been used in conjunction with the Repsold pendulum (362). Present in
Annual Accounts for 1876-71;- see 646.
Now lost, is a circle dividing engine also by Perreaux, which