Name/Title
PyrometerEntry/Object ID
2013.3.65Description
Listed in the Philip Fall purchase, this instrument was valued at $60. The drawer contains bars of various metals. The rectangular water tank through which the bars pass was heated by spirit lamps one of which is missing.
A page of directions from W. & S. Jones for use of this apparatus reads as follows: The first lever is as 10 to 1, the second as 5 to 1. 10x5=50, that is 1.50 of an inch of motion be communicated the first lever will produce on inch of motion to any point in the circumference of the second, there being 20 teeth in on inch and 10 teeth in the pinion in the center 20 teeth in the circumference of the second lever will produce two revolutions in the first pinion, the Dial plate is divided into 200 equal parts, 2 revolutions of the pinion is equal to 400 of these divisions and 400x50 shows to 1/20,000 part of an inch is seen in each division of the Dial plate -- The bar having expanded 1/10. The divided arc on the face registers the number of revolutions the long hand has made, which never exceeds 6--.Collection
Moosnick Museum - Scientific Apparatus