Post by michael on Oct 27, 2022 7:39:39 GMT
I have been busy recently as the Perkins Bacon hardening books have been put online by the RPSL.www.rpsl.org.uk/Quick-Links/Perkins-Bacon-Archive-Keywords-Browse
Those that have an interest in engraved stamps will probably be aware that the process of creating the plate of stamps involves a die and a transfer roller.
Transcribed data from the engraving and hardening books for revenue stamps of the Indian State of Ratlam:
From this you can work out the procedure for creating the plates (e.g. the 2 & 4 Anna values).
From the engraving book, the die without value was completed on 12/02/1913
On 13/02/1913 the die was hardened
The die would have been transferred to a soft roller
On 14/02/1913 the roller is hardened
The roller would have been used to create secondary dies and the values would have been engraved
From the engraving book, this was completed on 24/02/1913
On 24/02/1913 the secondary dies are hardened
The secondary dies would have been transferred to a soft roller
On 28/02/1913 the roller was hardened
The roller would have been used to make the plate of 20 stamps
On 10/03/1913 the 24 on plates were hardened
On 07/04/1913 there is a retrospective entry in the engraving book for the completion of all the plates
Stamps would then have been printed.