Surveying Instrument Collection
|
Maker |
FAVAG, Switzerland |
|
Model |
M427 |
|
Serial Number |
543352 |
|
Dimensions |
Length 280mm, Width 170mm, Height 210mm |
|
Image |
|
|
Description |
This instrument is used in conjunction with a chronometer and the eyepiece micrometer of an astronomical theodolite (such as the Wild T4) in order to reproduce their time record in graphical form. It is known as a tape chronograph since it features two circular reels with continuous strips of paper, and the paper is fed through the instrument at a uniform rate. It incorporates a clock-driven mechanism which moves the strip of paper at a steady rate (about 1cm/sec). It has a small electrical motor and the speed is regulated by means of a rheostat. The records of micrometer contacts (from the theodolite) are made alongside that of the chronometer seconds, instead of being superimposed upon it. The device uses needles instead of pens and a series of fine punctures on the strip of paper forms the record. |
|
History & comments |
This type of instrument was replaced by the printing precision time recorders (see 0114). |
|
Conservation |
A metal cover protects the instrument when not in use |
|
Condition |
Good condition, well maintained |
| Remarks |
|
|
Dates |
Manufactured in 1952. Catalogued in 1997 |
