British Thornton Blackbody Radiation Slide Rule (Similar to Blundell F5100) both made to the design of the Admiralty Research Laboratory, Teddington, England. This is one of three Black Body Radiation calculators of which I am aware, the others are the Aristo 922 and the General Electric GEN-15C referred to in the book Infrared System Engineering.
Thornton PIC Junior. PIC refers to the Precision Instrument Company taken over by A.G.Thornton (Alexander George) in 1901
.JPG)
Thornton Mannheim.
Thornton PIC 3641
Thornton PIC P3648
Thornton PIC 3649
Thornton PIC 3650
Thornton PIC 3654
Thornton PIC 3658
Thornton PIC 3857
Thornton PIC 4458
Thornton PIC 4865
Thornton PIC 4880
A.G Thornton PIC 101
Thornton PIC 111
Thornton PIC 121
Thornton PIC 130.
Thornton PIC 131.
Thornton PIC 131 with a nice Magnifying Cursor.
Thornton PIC 144
Large Thornton Slide Rule with no Make or Model Number my prize at the International Slide Rule Convention quiz.
Thornton PIC F157
Thornton PIC P123
Thornton PIC P170
Thornton PIC P171
Thornton PIC P172
Thornton PIC V.F.0123
Thornton PIC V.P.114
Thornton PIC V.P.147, A.C.Electrical Rule.
Britsish Thornton P221
British Thornton P241
British Thornton PIC 251
British Thornton P271
Thornton PIC P281
British Thornton AA010
British Thornton AA020
Britsish Thornton AD050
Britsish Thornton AD060
British Thornton AD070
British Thornton AD070, a Simplex (single sided) rule the same as the one above but labelled differently.
British Thornton AD150
British Thornton AD160
Most similar to the Thornton Rule Slide R.A. 10" VF1766
Thornton McLaren
Thornton PIC Speed, Time, Distance Rule, Pattern 1448.
Thornton Speed, Time, Distance Rule, 0552/1448.
Thornton Spring Design
