{ "instructions": [ { "date": [ { "earliest": 2012, "value": "2012-03-30", "latest": 2012, "primary": true } ], "note": "Complete", "author": "Shepherd, Rupert", "type": "CO Core Record QA" }, { "date": [ { "earliest": 2012, "value": "2012-03-23", "latest": 2012, "primary": true } ], "note": "Core Record", "author": "Van der Velden, Remke", "type": "CO" } ], "note": [ { "type": "catalogue note", "value": "Made after 1922. Inscription or label on instrument 'MANGANIN\/WHEATSTONE BRIDGE (PRECISION)\/ SERIAL NO. 1235\/1947\/ INTERNATIONAL OHMS\/H.W.SULLIVAN LTD. \/LONDON." } ], "agent": [ { "summary": { "title": "General Post Office" }, "@link": { "attribution": { "date": [ { "earliest": 2007, "value": "2007-09-17", "latest": 2007, "primary": true } ], "source": "assistant curator", "type": "X20L Related Organisation" } }, "@admin": { "uid": "hmc-agent-7037", "id": "agent-7037", "uuid": "33745560-01be-3bab-a457-754d9368b389" }, "@entity": "reference" } ], "loan": { "value": "N" }, "projects": [ "CollectionsOnline02", "EXPORT 4TH (2000-12-15)", "ExploringC20London", "MusicalInstrumentsOnline" ], "subject": [ { "summary": { "title": "City of London" }, "@link": { "attribution": { "date": [ { "earliest": 2007, "value": "2007-09-17", "latest": 2007, "primary": true } ], "source": "assistant curator", "type": "X20L Related Place" } }, "@admin": { "uid": "hmc-subject-148", "id": "subject-148", "uuid": "89fbe1c5-2d68-35bc-be99-c753097a8a7a" }, "@entity": "reference" }, { "summary": { "title": "New Technology in the Workplace 1900-1950" }, "@link": { "attribution": { "type": "X20L Related Subject" } }, "@admin": { "uid": "hmc-subject-109", "id": "subject-109", "uuid": "331dc8cb-a02c-37f7-95bf-8e5e43bd2f51" }, "@entity": "reference" }, { "summary": { "title": "Work" }, "@link": { "attribution": { "source": "curator", "type": "X20L Related Theme" } }, "@admin": { "uid": "hmc-subject-74", "id": "subject-74", "uuid": "bcc60ad3-814c-3a64-bf94-749e14af6e6f" }, "@entity": "reference" } ], "description": [ { "type": "catalogue description", "value": "Wheatstone Bridge, G.P.O. model. Rectangular base made from varnished wood. Black table. On lower part of table are four groups of nine copper resistance blocks, marked from 0 to 9, 0 to 90, 0 to 900 and 0 to 9000 respectively. At the top part of the table are more resistance blocks marked from left to right: 10000, 1000, 100, 10, 10, 100, 1000, 10000. Three chessmen-like bridges of differing sizes on top left and right corners of table. Six copper keys with black ebonite handles can be screwed into threads between the copper blocks. The Wheatstone bridge circuit diagram is engraved on the table, incorporating the resistance blocks. Also engraved on the table in the top right hand corner: INTERNAL OHMS. Bottom right hand corner: H.W. SULLIVAN Ltd LONDON. Bottom left hand corner: WHEATSTONE BRIDGE (PRECISION)\/ SERIAL NO. 1235\/1947. On the front side of the base, top right hand corner: P.O.; brass plaque reads: TEL 14808.", "primary": true }, { "attribution": { "date": [ { "earliest": 1996, "value": "1996", "latest": 1996, "primary": true } ], "attributor": "Wayne, Neil" }, "historical": true, "type": "description", "value": "Wheatstone Bridge, G.P.O. model. Rectangular base made from varnished wood. Black table. On lower part of table are four groups of nine copper resistance blocks, marked from 0 to 9, 0 to 90, 0 to 900 and 0 to 9000 respectively. At the top part of the table are more resistance blocks marked from left to right: 10000, 1000, 100, 10, 10, 100, 1000, 10000. Three chessmen-like bridges of differing sizes on top left and right corners of table. Six copper keys with black ebonite handles can be screwed into threads between the copper blocks. The Wheatstone bridge circuit diagram is engraved on the table, incorporating the resistance blocks. Also engraved on the table in the top right hand corner: INTERNAL OHMS. Bottom right hand corner: H.W. SULLIVAN Ltd LONDON. Bottom left hand corner: WHEATSTONE BRIDGE (PRECISION)\/ SERIAL NO. 1235\/1947. On the front side of the base, top right hand corner: P.O.; brass plaque reads: TEL 14808." }, { "date": [ { "earliest": 1999, "value": "26-Dec-99", "latest": 1999, "primary": true } ], "historical": true, "type": "description", "value": "Wheatstone Bridge G.P.O. model" }, { "attribution": { "date": [ { "earliest": 2015, "value": "2015-07-02", "latest": 2015, "primary": true } ], "attributor": "Wayne, Neil; Hawkins, Stewart; assistant curator", "source": "assistant curator" }, "type": "description (online)", "value": "Wheatstone Bridge, G.P.O. model. Rectangular base made teak and French polished. The top panel probably made from Keramot (ebonite) sprayed black. On the lower part of the table is the 'known arm' of the bridge, comprising four groups of ten polished and gold lacquered brass blocks arranged each side of a common centre block, marked from 0 to 9, 0 to 90, 0 to 900 and 0 to 9000 respectively. At the top part of the table are more brass blocks marked from left to right: 10000, 1000, 100, 10, 10, 100, 1000, 10000. These are the 'multiplying' and 'dividing' arms, used to extend the range above and below the values marked on the lower 'known arm'. The groups of brass terminals on the top left and right corners of the table are used to connect the battery to power the instrument, the galvanometer (used to indicate when the 'bridge' is in balance) and the 'unknown' resistance. Six brass tapered plugs with black ebonite handles are pushed into the tapered holes between the brass blocks to change internal resistances to 'balance the bridge'. The Wheatstone bridge circuit diagram is engraved on the table , incorporating the resistance blocks. Also engraved on the table in the top right hand corner: INTERNAL OHMS. Bottom right hand corner: H.W. SULLIVAN Ltd LONDON. Bottom left hand corner: WHEATSTONE BRIDGE (PRECISION)\/ SERIAL NO. 1235\/1947. On the front side of the base, top right hand corner: P.O.; brass plaque reads: TEL 14808." }, { "attribution": { "date": [ { "earliest": 2007, "value": "2007-12-20", "latest": 2007, "primary": true } ], "source": "assistant curator" }, "type": "commentary (online)", "value": "As well as inventing the English concertina, Sir Charles Wheatstone was responsible for many of the scientific breakthroughs of the Victorian era, including telegraphy, the stereoscope and most importantly his development of the Wheatstone Bridge \u2013 although he attributed Samuel Hunter Christie with its original invention. The Wheatstone Bridge was used to measure the electrical resistance of a conductor and was still in use until the advent of electronic measuring devices in the late 20th century. This example was made in London for the G.P.O. by H. W. Sullivan Ltd. in the first half of the 20th century." }, { "date": [ { "earliest": 2007, "value": "2007-09-17", "latest": 2007, "primary": true } ], "attribution": { "date": [ { "earliest": 2007, "value": "2007-09-17", "latest": 2007, "primary": true } ], "source": "assistant curator" }, "type": "X20L description", "value": "Wheatstone Bridge G.P.O. Model.\nAs well as inventing the English concertina, Sir Charles Wheatstone was responsible for many of the scientific breakthroughs of the Victorian era, including telegraphy, the stereoscope and most importantly his development of the Wheatstone bridge \u2013 although he attributed Samuel Hunter Christie with its original invention. The Wheatstone Bridge was used to measure the electrical resistance of a conductor and was still in use until the advent of electronic measuring devices in the late 20th century. This example was made in London for the G.P.O. by H.W. Sullivan Ltd., of Great Winchester Street, in the first half of the 20th century. Interestingly, keys and levers like those used in his concertinas often appear in Wheatstone's scientific inventions." }, { "attribution": { "date": [ { "earliest": 2015, "value": "2015-06-03", "latest": 2015, "primary": true } ], "attributor": "Hawkins, Stewart" }, "type": "description", "value": "I used to work for HW Sullivan Ltd, and would like to offer some corrections to your description. The case is made from teak and French polished. The top panel would usually be made from Keramot, sprayed black. On the lower part of the table is the 'known arm' of the bridge, comprising four groups of ten polished and gold laquered brass blocks arranged each side of a common centre block, marked from 0 to 9, 0 to 90, 0 to 900 and 0 to 9000 respectively. At the top part of the table are more brass blocks marked from left to right: 10000, 1000, 100, 10, 10, 100, 1000, 10000. These are the 'multiplying' and 'dividing' arms, used to extend the range above and below the values marked on the lower 'known arm'. The groups of brass terminals on top left and right corners of table are used to connect the battery to power the instrument, the galvanometer, (used to indicate when the 'bridge' is in balance) and the 'unknown' resistance. The bridge is said to be 'in-balance' when the 'known arm' equals the 'unknown' resistance being measured. Six brass tapered plugs with black ebonite handles are pushed into the tapered holes between the brass blocks to change internal resistances to 'balance' the bridge. Also engraved on the table in the top right hand corner: INTERNATIONAL OHMS." }, { "attribution": { "attributor": "Wayne, Neil" }, "type": "use", "value": "For measuring electrical resistance. This apparatus was widely used in many electrical measurement applications until the advent of the electronic measuring devices in the late 20th century." }, { "attribution": { "attributor": "Shepherd, Rupert" }, "type": "use (online)", "value": "For measuring electrical resistance. The bridge works by passing an electric current through two arms of an electric circuit. The \u00e2\u20ac\u02dcknown arm\u00e2\u20ac\u2122 contains two known resistances, whilst the \u00e2\u20ac\u02dcunknown arm\u00e2\u20ac\u2122 contains the unknown resistance and a variable resistance. A \u00e2\u20ac\u02dcbridge\u00e2\u20ac\u2122 connects the midpoints of the two arms, and contains a galvanometer to measure the current flowing between them. When the ratio between the unknown resistance and the variable resistance on the unknown arm is the same as the ratio between the two known resistances on the known arm, the bridge is balanced and no current will flow through the galvanometer. At this point, the unknown resistance can be calculated from the two known fixed resistances and the known variable resistance. This apparatus was widely used in many electrical measurement applications until the advent of the electronic measuring devices in the late 20th century." } ], "language": [ "eng" ], "type": { "sub_type": [ "general" ], "scope": "WHOLE", "base": "object" }, "legal": { "status": "permanent collection" }, "options": { "item_count": "1", "option7": "Neil Wayne Collection", "option5": "Miscellaneous", "flag4": "N", "flag3": "N", "system_count": "0", "flag2": "N", "option4": "EXPORT 4TH (2000-12-15); CollectionsOnline02; ExploringC20London; MusicalInstrumentsOnline", "flag1": "N", "number1": "1" }, "appraisal": [ { "source": "catalogue", "@entity": "lifecycle" } ], "inscription": [ { "note": [ { "value": "Wayne, Neil; 1996." } ], "method": "engraving", "inscriber": "H W Sullivan Ltd", "details": [ { "transcription": "INTERNAL OHMS" } ], "location": "top right-hand corner of table", "type": "inscription" }, { "note": [ { "value": "Wayne, Neil; 1996." } ], "method": "engraving", "inscriber": "H W Sullivan Ltd", "details": [ { "transcription": "H.W. SULLIVAN Ltd LONDON" } ], "location": "bottom right-hand corner of table", "type": "maker's name" }, { "note": [ { "value": "Wayne, Neil; 1996." } ], "method": "engraving", "inscriber": "H W Sullivan Ltd", "details": [ { "transcription": "WHEATSTONE BRIDGE (PRECISION) \/ SERIAL NO. 1235\/1947" } ], "location": "bottom left-hand corner", "type": "production number" }, { "note": [ { "value": "Wayne, Neil; 1996." } ], "method": "painting", "inscriber": "H W Sullivan Ltd", "details": [ { "transcription": "P.O." } ], "location": "top right of case front", "type": "inscription" }, { "note": [ { "value": "Wayne, Neil; 1996." } ], "method": "engraving", "inscriber": "H W Sullivan Ltd", "details": [ { "transcription": "TEL \/ 14808" } ], "location": "brass plaque, top right of case front", "type": "inscription" } ], "term": [ { "summary": { "title": "engraving" }, "@link": { "role": [ { "value": "technique" } ], "attribution": { "date": [ { "earliest": 1996, "value": "1996", "latest": 1996, "primary": true } ], "attributor": "Wayne, Neil" } }, "@admin": { "uid": "hmc-term-1016503", "id": "term-1016503", "uuid": "660a6f89-ad7b-3259-a03b-b34c121eeb93" }, "@entity": "reference" }, { "summary": { "title": "Wheatstone bridges" }, "@link": { "role": [ { "value": "object name (Horniman Ethno.)" } ], "attribution": { "attributor": "curator" } }, "@admin": { "uid": "hmc-term-1018427", "id": "term-1018427", "uuid": "26d5d2e2-811d-3eb5-aa94-e6a8c3b47777" }, "@entity": "reference" }, { "summary": { "title": "painting" }, "@link": { "role": [ { "value": "technique" } ], "attribution": { "date": [ { "earliest": 1996, "value": "1996", "latest": 1996, "primary": true } ], "attributor": "Wayne, Neil" } }, "@admin": { "uid": "hmc-term-1016537", "id": "term-1016537", "uuid": "771c9511-bc9a-35c7-b9a0-453d26e4b733" }, "@entity": "reference" } ], "physical": [ { "note": "Hawkins, Stewart; 2015-06-03.", "component": "case", "term": "teak", "descriptor": "material", "@reference": { "summary": { "title": "teak" }, "@link": { "role": [ { "value": "material" } ] }, "@admin": { "uid": "hmc-term-1019412", "id": "term-1019412", "uuid": "cc3bcf25-218f-3a05-900e-7da0a65e22b1" }, "sort": 1, "@entity": "reference" }, "type": "material" }, { "note": "Hawkins, Stewart; 2015-06-03.", "component": "case", "term": "French polishing", "descriptor": "technique", "@reference": { "summary": { "title": "French polishing" }, "@link": { "role": [ { "value": "technique" } ] }, "@admin": { "uid": "hmc-term-1019414", "id": "term-1019414", "uuid": "5e74d3ab-dd92-3646-b5f9-04dc058e5da5" }, "sort": 2, "@entity": "reference" }, "type": "technique" }, { "note": "Hawkins, Stewart; 2015-06-03.", "component": "blocks; terminals; plugs", "term": "brass", "descriptor": "material", "@reference": { "summary": { "title": "brass" }, "@link": { "role": [ { "value": "material" } ] }, "@admin": { "uid": "hmc-term-1015534", "id": "term-1015534", "uuid": "4078f338-da72-3fa9-a92c-69f5edb35e7b" }, "sort": 4, "@entity": "reference" }, "type": "material" }, { "note": "Hawkins, Stewart; 2015-06-03.", "component": "blocks", "term": "lacquer", "descriptor": "material", "@reference": { "summary": { "title": "lacquer" }, "@link": { "role": [ { "value": "material" } ] }, "@admin": { "uid": "hmc-term-1016335", "id": "term-1016335", "uuid": "40347501-1ba5-342b-8058-8d800368d56c" }, "sort": 5, "@entity": "reference" }, "type": "material" }, { "note": "Hawkins, Stewart; 2015-06-03.", "component": "blocks", "term": "polishing", "descriptor": "technique", "@reference": { "summary": { "title": "polishing" }, "@link": { "role": [ { "value": "technique" } ] }, "@admin": { "uid": "hmc-term-1018646", "id": "term-1018646", "uuid": "e45e5cbf-12f6-3577-845e-3acd731c8970" }, "sort": 6, "@entity": "reference" }, "type": "technique" }, { "note": "Hawkins, Stewart; 2015-06-03.", "component": "case top; handles of plugs", "term": "ebonite", "descriptor": "material", "@reference": { "summary": { "title": "ebonite" }, "@link": { "role": [ { "value": "material" } ] }, "@admin": { "uid": "hmc-term-1016470", "id": "term-1016470", "uuid": "f9ec7050-3968-3587-b06f-f75551e857c1" }, "sort": 3, "@entity": "reference" }, "type": "material" } ], "creation": { "date": [ { "source": "catalogue", "earliest": 1947, "value": "1947", "latest": 1947 }, { "attribution": { "attributor": "curator" }, "earliest": 1922, "value": "after 1922", "latest": 1922 }, { "role": [ { "value": "date made" } ], "attribution": { "date": [ { "earliest": 2015, "value": "2015-06-03", "latest": 2015, "primary": true } ], "attributor": "Hawkins, Stewart" }, "earliest": 1947, "value": "1947", "latest": 1947 } ], "maker": [ { "summary": { "title": "H. 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