- Subject
- Microscopy
- Item type
- Object
- Provenance
- Lent by the Royal Microscopical Society in 1970
- Primary inscriptions
- .1: "J. SWIFT / 15 Kingsland Rd / Collins Graduating Diaphagm [sic] & Webster Cindenser" on copper alloy disc. "R. M. S. No78" on diaphragm disc
- Object type
- Microscope accessory
- Inventory No
- 96266
- Accession Number
- 1970-101/part
Description
Webster's sub stage condenser with Collins' graduating diaphragm, as made by James Swift, has a four-bladed iris diaphragm worked by a side lever and a disc with two central stops and oblique stops. With a mill-edged screw with a cog fitting.
?
The design is that of J Webster, published in 'Science Gossip' (1 April 1865). Charles Collins devised the graduating diaphragm and describes it in his 'Guide to the Purchas of Microscopes' (1879).
Related Items
More related items- Hall Condenser, by J Swift, London, 1868Inventory Number 66991
Webster Condenser, by C. Collins, London, Late 19th CenturyInventory Number 11287
Webster Condenser, by C. Collins, London, Late 19th CenturyInventory Number 80656
Compound Monocular Microscope with Accessories, by J. Swift, London, c.1870Inventory Number 10136