Letter to Mr Naylor. Re his criticism of excessive current used by re-lighter.
Test must not have been correct since normally 2A is drawn from 110v. Every day practice is 3 - 4 A from the mains with resistance in circuit. High tension method used by Mr Best with induction coils and accumulators uses about 10A and larger coils in lamp rooms use 10 - 15A. Incandescent method with platinum or iron (22BWG) uses 20A. Details advised of improved coil manufacture, the initial breakthrough could not be repeated and it took some months to re-identify the reasons. Mr. Naylor offered first option of interest since it would be commercially more beneficial to have the unit described as Naylor & Davies, Wigan
As with the magnetic locking devices for the safety lamps, accusations of patent infringements related to re-lighter coil design were levelled in October 1907 following the explosion at Albion Colliery, Cilfynydd, and it is implied that Williams of Thomas & Williams, Aberdare, had a lot to say on the matter as a result of orders going from them. However, Naylor’s requested that an example of the new re-lighter be sent to Coates Peel Works, Salford with the intention of having Davies’s name on its description.
Henry Davies visited Naylor’s works on 27 February 1908 and Naylor advised that he would manufacture 100 lamps per week and would despatch 400 to No 8 Pit on Tuesday 3 March 1908. He advised in his letter to Naylor dated 11 May 1908 that.
All new lamps were put into use and the lamproom was stripped of everything and new shelves put in. There was no attempt to overhauling or cleaning them. Everything was done in such a hurry. When the time came to start they had no idea of what to do first. The head lampman stayed at home until all the fuss was over. The Tylorstown lampmen volunteered to help for my sake. Our Agent Mr Hannah is going before the Royal Commission again and orders may be delayed.
On 4 May 1908 two aluminium lamps arrived for Bodrwyallt and were given to the Manager and Under-manager of No 3 Pit
The royalties, rounded up to the nearest pound, earned from the manufacture of safety lamps which incorporated the above patents were recorded as follows.