| Description | Date | Identifier | |
| Recommendation to obtain samples of clutch material from Scandinavia Belt Co. for the Goshawk 11 clutch. | 1st Jul 1921 | Box 26 \ 4 Scan118 | |
| The supply of 6 'Halo' Clutch Rings for the Goshawk II engine. | 17th Aug 1921 | Box 26 \ 4 Scan119 | |
| 'HALO' jointless clutch rings and a letter from 'Scandinavia' Belting Ltd. | 17th Aug 1921 | Box 26 \ 4 Scan120 | |
| Quotation from Scandinavia Belting Limited for 'HALO' jointless wound non-metallic asbestos clutch rings. | 16th Aug 1921 | Box 26 \ 4 Scan121 | |
| Performance of graphite-impregnated Ferobestos clutch material. | 1st Aug 1921 | Box 26 \ 4 Scan122 | |
| Increasing clutch spring pressure to prevent slipping and seeking expert opinion on the new pressure on the disc material. | 23th Aug 1921 | Box 26 \ 4 Scan123 | |
| The Goshawk 11 flywheel and clutch, discussing the co-efficient of friction for Ferobestos material. | 24th Aug 1921 | Box 26 \ 4 Scan124 | |
| Attached copy of a letter received from Messrs. Ferodo Limited. | 26th Aug 1921 | Box 26 \ 4 Scan125 | |
| Letter from Ferodo Limited regarding a misunderstanding about clutch plates containing graphite and the delivery of rings for testing. | 25th Aug 1921 | Box 26 \ 4 Scan126 | |
| Cover note regarding a letter received from Messrs. Ferodo Limited about Plate Clutch Linings for the Goshawk II. | 27th Aug 1921 | Box 26 \ 4 Scan127 | |
| Letter from Ferodo Limited regarding plate clutch linings, discussing potential 'jaggering' issues. | 27th Aug 1921 | Box 26 \ 4 Scan128 | |
| Letter from Ferodo Limited concerning the specifications and supply of clutch linings. | 11th Aug 1930 | Box 26 \ 4 Scan129 | |
| Plate warping in the Goshawk 11 clutch and potential solutions. | 1st Sep 1921 | Box 26 \ 4 Scan130 | |
| Six schemes for wheel and clutch improvements, including curved spokes and corrugated plates. | 9th Sep 1921 | Box 26 \ 4 Scan131 | |
| The material for Goshawk II rear brake drums, specifically addressing the issue of low carbon content in mild steel. | 16th Sep 1921 | Box 26 \ 4 Scan132 | |
| Dissatisfaction with the Goshawk 11 clutch fabric and a request for alternative materials from Ferodo. | 10th Oct 1921 | Box 26 \ 4 Scan133 | |
| Complaints of ineffective foot brakes due to issues with Ferodo liners. | 10th Oct 1921 | Box 26 \ 4 Scan134 | |
| Fabrics for the Goshawk II clutch, forwarding a reply from Ferodo Ltd. | 6th Oct 1921 | Box 26 \ 4 Scan135 | |
| Letter from Ferodo Limited discussing alternative materials and a trial for Goshawk 11 clutch discs. | 5th Oct 1921 | Box 26 \ 4 Scan136 | |
| Continuation sheet of a letter from Ferodo Limited regarding the fitting and performance of Ferobestos linings. | 11th Aug 1935 | Box 26 \ 4 Scan137 | |
| Shuddering issues with the Goshawk 11 clutch and proposed modifications to the linings. | 7th Oct 1921 | Box 26 \ 4 Scan138 | |
| Letter from Ferodo Ltd., a missing graph, and incorrectly labelled brake linings for a 40/50 HP Chassis. | 13th Oct 1921 | Box 26 \ 4 Scan139 | |
| Experimental suggestions for issues with rear hub and brake performance. | 14th Oct 1921 | Box 26 \ 4 Scan140 | |
| Performance of brake drums and liners, referencing material composition and wear conditions. | 14th Oct 1921 | Box 26 \ 4 Scan141 | |
| Continued communication regarding experimental work and requesting suggestions from Messrs. Ferodo Ltd. | 14th Oct 1921 | Box 26 \ 4 Scan142 | |
| Communication forwarding a reply from Ferodo Ltd. regarding brake liners for the 40/50 HP chassis. | 28th Oct 1921 | Box 26 \ 4 Scan143 | |
| Letter from Ferodo Limited concerning the performance of 40/50 HP chassis brake liners. | 26th Oct 1921 | Box 26 \ 4 Scan144 | |
| Letter from Ferodo Limited discussing brake lining performance, friction, and potential mechanical issues. | 19th Aug 1921 | Box 26 \ 4 Scan145 | |
| Proposal to supply Ferodo Ltd. with a complete rear hub and brake assembly for testing brake liners on a 40/50 chassis. | 1st Nov 1921 | Box 26 \ 4 Scan146 | |
| Quoting a follow-up letter from 'Scandinavia' Belting Ltd. regarding the testing of 'Halo' brake materials. | 3rd Nov 1921 | Box 26 \ 4 Scan147 | |
| Letter from Cresswell's Limited discussing the co-efficient of friction for their 'Chekko' asbestos brake linings. | 1st Dec 1921 | Box 26 \ 4 Scan148 | |
| Letter from Cresswells' Limited detailing the capabilities of their testing machine for brake and clutch linings. | 2nd Sep 1924 | Box 26 \ 4 Scan149 | |
| Confirming receipt of brake liners and clutch discs in Chekko Semi Metallic Material from Cresswells' Limited. | 7th Dec 1921 | Box 26 \ 4 Scan150 | |
| The co-efficient of friction for 'Baraut' and 'Chekko' brake linings. | 13th Dec 1921 | Box 26 \ 4 Scan151 | |
| Letter from Small & Parkes Ltd. detailing co-efficient of friction test results for No.1 Asbestos Metallic 'Baraut' brake lining. | 10th Dec 1921 | Box 26 \ 4 Scan152 | |
| The second page of a letter received from Small & Parkes Ltd. | 6th Dec 1921 | Box 26 \ 4 Scan153 | |
| Communication regarding brake and clutch linings received from Messrs. Cresswell Ltd. of Bradford. | 6th Dec 1921 | Box 26 \ 4 Scan154 | |
| Letter from Scandinavia Belting Co. Ltd. regarding the return of a clutch cone and an inquiry about previously submitted clutch rings. | 7th Feb 1922 | Box 26 \ 4 Scan155 | |
| Comparative costs and testing strategy for different brake liners for the Goshawk model. | 14th Feb 1922 | Box 26 \ 4 Scan156 | |
| Unsuitability of a damping material for a brake drum flange and proposing consultation with Ferodo for an alternative asbestos-based fabric. | 28th Jul 1922 | Box 26 \ 4 Scan157 | |
| Confirming an order with Ferodo Ltd. for 100 sets of Brake and Clutch Liners made from die-pressed Ferodo Bonded Asbestos. | 9th Aug 1922 | Box 26 \ 4 Scan158 | |
| Request for a report on 'Halo' jointless clutch ring samples from Scandinavia Belting Ltd. | 28th Jul 1922 | Box 26 \ 4 Scan159 | |
| Copy of a letter from supplier 'Scandinavia' Belting Ltd. regarding friction fabrics and other automotive components. | 26th Jul 1922 | Box 26 \ 4 Scan160 | |
| Black pigment finish on brake liners supplied by Ferodo Ltd for the 40/50 HP Chassis and Goshawk 11. | 19th Oct 1922 | Box 26 \ 4 Scan161 | |
| Rear brakes for the 40/50 HP Chassis, enclosing a letter and two brake linings from Ferodo Ltd. | 9th Oct 1922 | Box 26 \ 4 Scan162 | |
| Black pigment coating on brake liners for the 40/50 HP Chassis and Goshawk 11. | 19th Oct 1922 | Box 26 \ 4 Scan163 | |
| Instructions from Ferodo Ltd. to omit black dressing from specific brake liners for the 40/50 HP and 'Goshawk' chassis. | 24th Oct 1922 | Box 26 \ 4 Scan164 | |
| Instructions from Ferodo Ltd. to omit black dressing on brake liners for the 40/50 HP & 'Goshawk II D' chassis. | 24th Oct 1922 | Box 26 \ 4 Scan165 | |
| Letter from Ferodo Limited concerning a remedy for a noisy and jerky clutch. | 13th Dec 1922 | Box 26 \ 4 Scan166 | |
| Letter from Ferodo Limited to R. Harvey Bailey regarding brake and spring interleaving materials. | 13th Dec 1922 | Box 26 \ 4 Scan167 | |
| Slipping effects and load on keys for a Goshawk 11 plate clutch, in response to a letter from Ferodo. | 15th Jan 1923 | Box 26 \ 4 Scan168 | |
| Letter from Ferodo Limited concerning clutch and brake linings for the Goshawk clutch. | 11th Jan 1923 | Box 26 \ 4 Scan169 | |
| Material selection (Raybestos vs. Ferodo) and design modifications for the Goshawk and Seagull single plate clutch. | 10th Jan 1923 | Box 26 \ 4 Scan170 | |
| Material for fixing rear brake shoes from Raybestos-Belaco Limited. | 9th Feb 1923 | Box 26 \ 4 Scan171 | |
| Comparative test report on Raybestos and Ferodo clutch fabrics for a 20 HP clutch. | 16th Feb 1923 | Box 26 \ 4 Scan172 | |
| The loss of friction in brake and clutch materials and collaboration with Ferodo Ltd. to resolve the issue. | 30th Jan 1923 | Box 26 \ 4 Scan173 | |
| Letter from Ferodo Ltd. detailing the test results for a 20 HP plate clutch lining. | 30th Jan 1923 | Box 26 \ 4 Scan174 | |
| Test results for Ferodo Bonden Asbestos plate clutch linings. | 16th Feb 1923 | Box 26 \ 4 Scan175 | |
| Instruction sheet with test results comparing Raybestos and Ferodo clutch fabrics. | 16th Feb 1923 | Box 26 \ 4 Scan176 | |
| Report comparing the performance of Raybestos and Ferodo clutch materials. | 13th Mar 1918 | Box 26 \ 4 Scan177 | |
| Requesting data on the wear rate and destructive testing of three different types of Goshawk 11 clutch fabrics. | 28th Feb 1923 | Box 26 \ 4 Scan178 | |
| Wear rate and coefficient of friction for Goshawk clutch material and related investigations with the supplier, Ferodo. | 1st Mar 1923 | Box 26 \ 4 Scan179 | |
| Testing of a new 40/50 type clutch cone fabric from Ferodo Limited, which is claimed to eliminate squeaking. | 3rd May 1923 | Box 26 \ 4 Scan180 | |
| Letter from Ferodo Limited discussing the development and properties of a new oil-retaining asbestos clutch lining. | 2nd May 1923 | Box 26 \ 4 Scan181 | |
| Letter from Ferodo Limited's Managing Director regarding a foolproof clutch lining. | 1st Jun 1923 | Box 26 \ 4 Scan182 | |
| Special asbestos and wire clutch material supplied by Ferodo Limited for the 40/50 chassis. | 1st Jun 1923 | Box 26 \ 4 Scan183 | |
| Letter to Ferodo Limited seeking assistance with the problem of squeaking brakes. | 24th Oct 1923 | Box 26 \ 4 Scan184 | |
| Letter from Ferodo Limited discussing the causes of and potential solutions for squeaky brakes. | 29th Oct 1923 | Box 26 \ 4 Scan185 | |
| Letter from Ferodo Limited detailing findings on brake noise, friction materials, and testing procedures. | 29th Oct 1923 | Box 26 \ 4 Scan186 | |
| Letter to Messrs. Ferodo Ltd. to arrange a meeting about interleaving for road springs and squeaking brakes. | 5th Nov 1923 | Box 26 \ 4 Scan187 | |
| Telegram detailing a solution for a brake 'jaggering' issue by modifying the Ferodo brake lining. | 16th Nov 1923 | Box 26 \ 4 Scan188 | |
| Bentley Motors' adoption of 'HALO' brake lining material, with an appended extract from 'The Autocar' magazine. | 1st Dec 1923 | Box 26 \ 4 Scan189 | |
| The analysis and testing of a 20 HP footbrake using a Froude water brake. | 4th Dec 1923 | Box 26 \ 4 Scan190 | |
| The test of Ferodo brake linings with varying positions on brake shoes. | 4th Dec 1923 | Box 26 \ 4 Scan191 | |
| Sketches illustrating the position of Ferodo brake lining on different brake shoe designs. | 4th Dec 1923 | Box 26 \ 4 Scan192 | |
| Summary of tests showing three different configurations for the position of Ferodo brake linings on brake shoes. | 7th Dec 1923 | Box 26 \ 4 Scan193 | |
| The reverse side of a document showing a date stamp from Derby. | 7th Dec 1923 | Box 26 \ 4 Scan194 | |
| Tests conducted on 'Halo' brake linings, with the segment in the centre of the shoe only. | 1st Dec 1923 | Box 26 \ 4 Scan195 | |
| Graph comparing the performance of Ferodo and Halo brake linings, showing the effects of temperature under a 20lbs load. | 7th Jul 1914 | Box 26 \ 4 Scan196 | |
| Stamped, otherwise blank, document page. | 7th Jul 1914 | Box 26 \ 4 Scan197 | |
| Test of Ferodo lined wrapping brake shoes. | 8th Dec 1923 | Box 26 \ 4 Scan198 | |
| Comparative test report on various brake shoe designs and their performance. | 1st Dec 1923 | Box 26 \ 4 Scan199 | |
| Brake shoe endurance test, detailing its performance, rolling action, and wear. | 1st Dec 1923 | Box 26 \ 4 Scan200 | |
| Telegram confirmation with instructions to modify a vehicle's servo brake and front springs. | 11th Dec 1923 | Box 26 \ 4 Scan201 | |
| Requesting experiments on four-wheel brakes to test variations due to surface conditions and compare Halo and Ferodo materials. | 11th Dec 1923 | Box 26 \ 4 Scan202 | |
| Tests on 'HALO' brake material and comparing its performance against Ferodo. | 12th Dec 1923 | Box 26 \ 4 Scan203 | |
| Road test report comparing the efficiency of 'Halo' and 'Ferodo' brake linings when cold and hot. | 18th Dec 1923 | Box 26 \ 4 Scan204 | |
| Secret memo discussing an unexpectedly high multiplication factor in a servo mechanism, questioning the co-efficient of friction. | 13th Dec 1923 | Box 26 \ 4 Scan205 | |
| Fault with 'HALO' brake lining, which becomes dangerously ineffective when hot. | 19th Dec 1923 | Box 26 \ 4 Scan206 | |
| Defect in Halo Brake Material where it loses its co-efficient with temperature. | 28th Dec 1923 | Box 26 \ 4 Scan207 | |
| Cover note forwarding a letter from Scandinavia Belting Limited regarding 'Halo' Brake Lining. | 28th Dec 1923 | Box 26 \ 4 Scan208 | |
| Letter from Scandinavia Belting Ltd. regarding the performance of 'Halo' brake lining material when hot. | 27th Dec 1923 | Box 26 \ 4 Scan209 | |
| Communication with the Scandinavia Belting Company regarding 'Halo' Brake Linings and their efficiency. | 1st Jan 1924 | Box 26 \ 4 Scan210 | |
| Letter from Scandinavia Belting Ltd. regarding the performance and testing of brake lining materials. | 31th Dec 1924 | Box 26 \ 4 Scan211 | |
| Letter to Ferodo Ltd. regarding the testing of different brake materials and their characteristics. | 1st Jan 1924 | Box 26 \ 4 Scan212 | |
| The second page of a typed letter, concluding with a request. | 1st Jan 1924 | Box 26 \ 4 Scan213 | |
| Friction material for slipper flywheels, recommending a new material due to issues with swollen fibre washers. | 1st Jan 1924 | Box 26 \ 4 Scan214 | |
| Letter from Ferodo Limited discussing the characteristics and patent of their asbestos friction linings. | 5th Jan 1924 | Box 26 \ 4 Scan215 | |
| Letter from Ferodo Limited discussing the coefficient of friction of their bonded asbestos materials and arranging a demonstration. | 5th Jan 1924 | Box 26 \ 4 Scan216 | |
| Graph comparing the coefficient of friction of Ferodo Fibre and Ferodo Bonded Asbestos at various slipping speeds. | 7th Jan 1924 | Box 26 \ 4 Scan217 | |
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