INVENTORS
About 150 lamps were in use at No5 Pit, Tylorstown. The quality of lamps was an improvement. However, the lampmen complained about bad soldering of the lamp bases. Complaints from Nos 6 & 7 Pits re leaks. These have been resolved by replacing the leather washers with rubber ones. Not yet converted lamps to light by induction coil but previous batch of lamps would light with a coil if the insulation tube were smeared with rubber solution and left to harden a little in the lamps. Still awaiting a number of magneto machines from GEC. A lamp can be lit with 1 ampere at 110v. In the ordinary ways of igniting lamps with incandescent wires or with coils the consumption of power is greater on account of waste and charging. Henry Davies suggests that Naylor should witness the method of working. Enquires into his intention on "testing the South Wales Coalfield" since he has been promised sole rights and that there are others in the district doing all they can to get orders for their own little things.
A further letter from Henry Davies to N J Naylor dated 1 June 1906 advised:
Comments on washers under burner flanges used at Tylorstown. Also enclosing a sample of wire for making oil valve springs since lots of complains re leaking. Springs found to be faulty since they were only made of 5 turns of No 18 gauge wire. Too short and stiff. After experimenting he found that the best springs are made from 12 turns of No2 BWF steel piano wire. Comments also on poor insulation not being an improvement as promised. Made a new coil which is better and cheaper than that made by AB. Still not received a Firemans lamp. Mr Jacobs the new Agent has asked for a Fireman's lamp with magnetic lock and electric ignition to be made but would like to see you before I start. Request that lamp ventilation be improved to reduce outside casing temperature.
This was followed by another letter dated 15 July 1906 advising.
New springs a success. New coil ignited all lamps at No 8 Pit. Suggestions for modifications to Fireman's lamp
By August 1906 Naylor’s had manufactured 2000 lamps and an order was received during September 1906 for 1,400 lamps for Freetown Pit, Rother Vale Co. A sample lamp was also sent to Australia in October 1906.
Developments of his new transformer operated lighter progressed well and this was demonstrated to Lord Monkswell, a Liberal politician, at the Ferndale offices during December