Surveying Instrument Collection
Maker |
Allbrit |
Model |
Polar Planimeter |
Serial Number |
21193 |
Dimensions |
246 x 82 x 40 mm |
Image |
|
Description |
The polar planimeter is of the type discussed under the heading 'Amsler's planimeter' in J. Clendinning ' The Principles of Surveying', (Blackie & Sons Ltd, London/Glasgow, 2nd ed. 1960, Reprint 1965). The Fig. 12.11 (Page 250) in the book shows exactly the planimeter at hand. However, the manufacturer here is ALLBRIT (ENGLAND) and nor W.F. Stanley & Co Ltd as in the book. The readout of the integrating wheel is by vernier as is the readout on the graduate arm (tracing bar). The box contains a magnifying glass (for reading the verniers) and a metal strip with a pin at one end and two drill holes marked 9.95 square inch (at about 48 mm from the pin) and 19.90 square inch (at about 67 mm from pin) and a third unlabelled one (at about 77 mm from pin). This bar could be used to trace three circles for calibration purposes. The serial number is engraved on the integrating carriage and on the radius bar (to pole/pin). |
History & comments |
pre 1960 |
Conservation |
in black Bakelite box with two locks |
Condition |
Good condition. Some paint damage on radius bar, 2 rubber buffers missing |
Remarks |
The box contains a table with the calibration settings for a few imperial and metric scales, including 1:1. Box marked P/C 29194 and No. 8 and 21193 on the outside |
Dates |
Catalogued by JMR in Oct 2011. Photo by JMR. |