break up into short threads. Desaguliers illustrates a thermometer that is provided
with a scale rising to 600° F, then believed to be the boiling point of mercury.
Desaguliers( i 744) XXII, lig. 6. For other references, see Cat. 197.
Inv. 42/1
199 THERMOMETER f/4 19th C. (1227) Fig. 173, 177, 178, 179
By A. van Fmdcn, Amsterdam
Signed on the back of the register plate: A. v. Emden Fecit Amsteld.
Overall length 480.
A Fahrenheit, mercury-in-glass thermometer, divided in degrees and inscribed, in four-
degree intervals, from 1440 F down to -56° 1 . The back of the silvered-brass register
plate is engraved with conventional names for temperature regions in capital letters,
and also some extremes recorded in a few towns in ordinary script. I hese inscriptions
are: Bloed warm; Hete lugt; Warm; Matig; Vorst; Extra koud; 90 Amst. 1738;
56 Oranjc; -2 Amst. 1740; ( 1 Upsal 1740; -28 Petersb. 1748.
For references, see Cat. 197.
* Copyright Rijksmuseum voor de Geschiedenis der Naluurwclenschappen, Leiden.