From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Comparison table of specifications for Marston Mark VI and American Bonded Core radiator blocks.
| Identifier | ExFiles\Box 150\3\ scan0004 | |
| Date | 21th April 1936 guessed | |
| MARSTON MARK VI BLOCK. AMERICAN BONDED CORE. 24.05" X 19.7" X 58 mm. 24.05" X 19.7" X 52 mm. .006" Waterways. .005" Waterways. .005" Waterways. .004" Centres. .004" Centres. .004" Centres Tinned Not Tinned Tinned Not Tinned Not Tinned. Act. Est. Estimated. Estimated. Estimated. Estimated. No. of layers 38 38 38 38 38 38 No. of Centres 38 38 38 38 38 38 Total length of layers. 2004.5" 2004.5" 2004.5" 2004.5" 2004.5" 2004.5" Total length of centres. 3923.5" 3923.5" 3923.5" 3923.5" 3923.5" 3923.5" Volume of layers (cu.in.) 27.45 27.45 22.88 22.88 22.88 20.63 Volume of centres (cu.in.)35.21 35.21 35.21 35.21 35.21 32.31 Weight of layers. (lbs.) 9.75 8.853 8.76 7.717 7.624 6.864 Weight of centres. (lbs) 12.75 11.365 11.24 11.365 11.24 10.35 Solder on ends of layers(lbs.) .14 .14 .14 .14 .14 .14 Solder picked up (lbs). 10.86 10.0 9.0 10.0 9.0 9.0 Total Solder used (lbs.) 11.0 10.14 9.14 10.14 9.14 9.14 Weight per unit volume (cu.ins) .453 .477 .501 .503 .472 .478 TOTAL WEIGHT IN LBS. 33.5 30.35 29.14 29.222 28.004 26.354 | ||