Light Laboratories Brighton Thermometer, range -40C to +110C. Housed in leather box with carying handle.
This is a bridge type instrument with the capability of measuring the temperature of up to six items. The box contains a 8 position switch (off/test/1/2/3/4/5/6), meter, 3;1 taper 1000 ohm variable resistor and a 1.2 volt rechargeable cell. The bridge components which comprise 4 wire wound resistors for each temperature sensor are housed in the individual 8 gold contact plugs.
There are many references to this firm on the internet, but I have not found out very much about the firm except that it was based in several places in Brighton over the years. The earliest reference I have found is on page 332 of the British Medical Journal of September 7th 1946. In the short article on this page is described a skin temperature measuring instrument measuring from 10-40 degrees Centigrade to within 0.1 degree. The instrument based upon a Wheatstone bridge (as mine is) was made by Mr Arthur Light.
Chris Wild came across my website whilst google searching for information on his family history. He was looking for Arthur Dennison Light, a distant cousin by marriage. He has found circumstantial evidence that he was associated with Light laboratories. His brother Walter was living in Brighton in 1911 but Arthur D, was living in Walthamstow. Unfortunately he has not found out what they were doing for a living.
He has found out quite a bit about Arthur Light which I reproduce here:
"He was born in 1876 in Hampshire, died in 1970 and was one of 15 children. In the early 1900's he practised as a medical electrician or galvanist in London trading as The Health Culture Company and The Institute of Natural Theraputics. He was involved in a couple of partnerships, one of which was with two of his brothers, Alfred Weldon and Walter. He was also involved with a B Copson Garrett who seems to have been a forerunner in electricity and medicine. In 1910 he was operating a business as a magnetic appliance manufacturer. Then in 1914/15 he was found guilty of "providing false analyses". This presumably meant he could no longer practice and he turned his attention to the manufacture of medical instruments. It is possible that Light Laboratories was set up by Arthur and Walter. Walter was living in the Brighton area during the early 1900's and was, by all accounts, the entrepreneur of the family, although some considered him a "bit of a rogue". The only evidence I have for Arthur being in Brighton is his connection with Light Laboratories and their being in Brighton."
Chris has located one of his patents http://v3.espacenet.com/publicationDetails/biblio?DB=EPODOC&adjacent=true&locale=en_gb&FT=D&date=19480126&CC=GB&NR=597420A&KC=A
An adverisement fom the late 1970's
David John Collins (gw4ynp) found a 1946 wbgr meter in a garage,on looking on the internet to see what they were used for he came accross my web site and and saw that Chris Wild was looking for his family tree. The paperwork with the meter is signed by a Mr A L Light (Light Laboratories) 10 Ship Street Gardens Brighton.
He adds: The wet bulb globe tester (wbgt) was used as a heat stroke checker and still is commonly used as a guide for environmental heat stress to prevent heat stroke during physical exercise or wile at work, they were developed by the military. You can still buy them today but they are hand held instruments.
