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| lordedmond:
opps red face i blame the AGE factor Stuart |
| Shadow:
I used to be in the survey instrument repair business. I have worked on instruments dating as old as 1873. I am not familiar with the instrument shown and would suggest taking it to a instrument shop in your area before attacking the brass with any polishing compound. If the instrument has any value, alteration could destroy some value. The straight knurled knobs and rather straight angular features may suggest it is a more modern day copy, not an orginal of any particular maker. I have an old instrument someone held up to a buffing wheel and seemingly removed a green deposit. The excess black buffing compound was left in recesses and odd shaped areas. The instrument as manufactured had a green finish applied over the brass, it was not discolored brass. The result was an instrument that was intact in every other aspect, including the spider web crossgair, but now the finish was destroyed. |
| philf:
--- Quote from: raynerd on May 29, 2013, 07:56:24 AM ---Has anyone got any idea what on earth this is. It looks lovely, but I just haven't a clue!! I don't have a idea so no idea who to ask!! If anyone can tell me or point me in the right direction. Chris --- End quote --- Hi Chris, Don't get your Grandad too excited. It's really an ornamental object probably made in India. See: http://www.ebay.co.uk/itm/9-SOLID-BRASS-THEODOLITE-Alidade-SURVEY-INSTRUMENT-/121114260104?pt=LH_DefaultDomain_0&hash=item1c32f8f288#ht_2707wt_1170 for an identical (although shiny) one. Cheers. Phil. |
| RodW:
--- Quote from: lordedmond on May 29, 2013, 02:01:51 PM ---opps red face i blame the AGE factor Stuart --- End quote --- X 2. The advantage of a theodolite is that you can change the angle in uneven terrain so you had less setups. But the maths is a lot more complex to calculate distance. When leveling it, follow the left hand thumb rule. Pick any two knobs and put the thumbs of each hand on them. Either move your two thumbs out and away from each other or in and towards each other. The levelling bubble will follow the left hand thumb. Get it level one way then pick a different set of two knobs and repeat. Continue until level which should be quick unless you break the rule! |
| raynerd:
--- Quote from: philf on May 30, 2013, 04:11:50 AM --- --- Quote from: raynerd on May 29, 2013, 07:56:24 AM ---Has anyone got any idea what on earth this is. It looks lovely, but I just haven't a clue!! I don't have a idea so no idea who to ask!! If anyone can tell me or point me in the right direction. Chris --- End quote --- Hi Chris, Don't get your Grandad too excited. It's really an ornamental object probably made in India. See: http://www.ebay.co.uk/itm/9-SOLID-BRASS-THEODOLITE-Alidade-SURVEY-INSTRUMENT-/121114260104?pt=LH_DefaultDomain_0&hash=item1c32f8f288#ht_2707wt_1170 for an identical (although shiny) one. Cheers. Phil. --- End quote --- Haha... Oh dear!!! That definitely looks identical to mine!! Great find Phil. Pity it isn't anything special but at least I know what it is! Chris |
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