Surveying Instrument Collection
Maker |
Kern & Co, Aarau, Switzerland |
Model |
Traversing Targets (Set of 2), Part of 'PZ' traversing equipment |
Serial Number |
none |
Dimensions |
55 mm diameter, 210 mm high |
Image |
|
Description |
Traversing targets (set of 2) with three levelling screws, optical plummet (rotating with target) and plate level. The upper figure shows how the target is mounted on a matching KERN tilting plate tripod. Engraved: Kern Aarau Suisse Switzerland. The targets are numbered '11' and '11A'. The metal box contains two targets (nominal target height = 160 mm), two plates with the KERN centring system on top (Nos. '11E' and '10D') and a female 16 mm diameter centring thread underneath. The latter allows attachment on titlting plate trivets (see 0241) and tilting plate tripods (see 0244). The box also contains two lighting sets (Nos. '10F', '10E') for the targets and spaces for 2 spare batteries (20 mm diameter, 3 V, 70 mm long) and two spare light bulbs. Plate level: 50"/2 mm Magnification of optical plummet: 1.7 x The centres of the targets do not deviate more than 0.2 mm horizontally and 1 mm vertically from their nominal positions. The metal box carries a label: AG Barker & Assoc P/L, Melbourne, Engraved '11G' |
History & comments |
pre 1966 |
Conservation |
In painted metal box (325 mm x 190 mm x 165 mm) |
Condition |
Box excellent, targets good with a few scratches on paint |
Remarks |
Last serviced in July 1992 (RS). More information in KERN Brochure 136d 3.66 'Centring Tripod, Forced Centring, Traversing Equipment' |
Dates |
Catalogued in 2008 by JMR. Photo by JMR. |