| RefNo | MS/957/92 |
| Level | Item |
| Title | Letter from T R [Thomas Romney] Robinson, Armagh Observatory, to Captain [Henry] Kater, 12 York Gate, London |
| Creator | Robinson: (John) Thomas Romney (1793-1882); Irish astronomer and physicist |
| Date | 23 September 1828 |
| Description | He received Kater's two papers via Captain [Francis] Beaufort. He takes pleasure in the vertical collimator paper as he has taken an interest in that invention and its importance to the mural circle. The new modification is an improvement and he suggests other possible alterations. Rusting of the iron trubled him with his horizontal collimater, arising from voltaic action between the iron and mercury. A dread of magnetism and hydrogen made him try glass. He gives details of this, asking if Kater has tried coloured glass, and whether he has worked on the theory of probability to observations. He discusses probability errors. Jones promises him the circle this winter and this prevents Robisnon sending details of what he has done with the glass collimator, as he hopes for more striking results with this, than with the equatorial. He hoped that Kater would come to Ireland but thinks he does not like it. |
| Extent | 4p. |
| Format | Manuscript |
| PhysicalDescription | Ink on paper |
| Dimensions | 233x188mm. |
| AccessStatus | Open |
Fellows associated with this archive
| Code | PersonName | Dates |
| NA2440 | Robinson; Thomas Romney (1792 - 1882) | 1792 - 1882 |