| Description | Date | Identifier | |
| Springs and loads for a rear hydraulic damper on a 20-HP chassis. | 1st Dec 1927 | Box 55 \ 4 Scan132 | |
| Car tests, including a 20 HP car and a Stutz, and requesting feedback on Phantom hydraulics and Chrysler engine mountings. | 2nd Dec 1927 | Box 55 \ 4 Scan133 | |
| The adjustment of front shock absorber loading on two trial cars. | 2nd Dec 1927 | Box 55 \ 4 Scan134 | |
| The shock absorber loadings for models 16-NC and 65-EF. | 1st Dec 1927 | Box 55 \ 4 Scan135 | |
| Shock absorber loadings for models 16-NC and 65-EF, with a handwritten reply. | 6th Dec 1927 | Box 55 \ 4 Scan136 | |
| Recommending shock absorbers be sent to Derby for modification to alter the low-pressure side loads. | 6th Dec 1927 | Box 55 \ 4 Scan137 | |
| Confirming an improvement in pitching after modifying the front hydraulic shock absorbers on chassis 59-LF. | 14th Dec 1927 | Box 55 \ 4 Scan138 | |
| Modifications to hydraulic shock absorbers for chassis 59-LF. | 27th Dec 1937 | Box 55 \ 4 Scan139 | |
| Hydraulic shock damper performance, oil frothing tests, and new car models like the Sports Phantom. | 13th Jan 1928 | Box 55 \ 4 Scan140 | |
| Typed letter extract recommending the purchase of a car, mentioning its advanced features. | 13th Jan 1928 | Box 55 \ 4 Scan141 | |
| Car springing adjustments to address pitching issues and improve ride quality. | 13th Jan 1928 | Box 55 \ 4 Scan142 | |
| Recommendation for experimental loading of front and rear hydraulic shock absorbers using packing pieces. | 24th Jan 1928 | Box 55 \ 4 Scan143 | |
| Faulty near-side front hydraulic shock absorber on a Trials Phantom Saloon. | 24th Jan 1928 | Box 55 \ 4 Scan144 | |
| Lord Curzon's feedback on a Phantom model, covering shock dampers, clutch, controls, and bodywork. | 30th Jan 1928 | Box 55 \ 4 Scan145 | |
| Vehicle performance characteristics, including speed, bodywork, and engine compression. | 8th Feb 1928 | Box 55 \ 4 Scan146 | |
| Experiments on hydraulic shock dampers, focusing on eliminating temperature effects and modifying pressure passages. | 8th Feb 1928 | Box 55 \ 4 Scan147 | |
| Continued discussion on pressure velocity, damper loading and an objection to dampers fitted on model 14-EX. | 8th Feb 1928 | Box 55 \ 4 Scan148 | |
| Graph of Pressure vs. Piston Velocity with a diagram illustrating piston passage design. | 8th Feb 1928 | Box 55 \ 4 Scan149 | |
| Graph plotting pressure versus piston velocity for a standard type of shock damper, showing temperature variation effects. | 15th Feb 1928 | Box 55 \ 4 Scan150 | |
| Proposing to supply a heavier pair of front road springs for the 14-EX model to fix an issue with the front springs hitting the buffers. | 15th Feb 1928 | Box 55 \ 4 Scan151 | |
| Effectiveness and potential redesign of hydraulic dampers for Phantom and 20 HP models. | 19th Feb 1928 | Box 55 \ 4 Scan152 | |
| Replacement of Hartford's friction shock absorbers with hydraulic types like Lovejoy and Houdaille. | 2nd Feb 1928 | Box 55 \ 4 Scan153 | |
| Standard and experimental hydraulic damper loadings for Phantom & 20 HP models. | 23th Feb 1928 | Box 55 \ 4 Scan154 | |
| Fault with a damper caused by foreign matter lodging on the valve seat. | 28th Feb 1928 | Box 55 \ 4 Scan155 | |
| Adjustments to hydraulic damper settings for the Phantom and 20 HP models. | 28th Feb 1928 | Box 55 \ 4 Scan156 | |
| Letter discussing findings from an investigation into knocking front shock absorbers. | 8th Mar 1928 | Box 55 \ 4 Scan157 | |
| Test report on modifying air vents and replenishing valves to prevent vacuum-pockets and shocks in an instrument. | 8th Mar 1928 | Box 55 \ 4 Scan158 | |
| Cure using .020 vent and larger replenishing valves, and referring the matter for further analysis. | 8th Mar 1928 | Box 55 \ 4 Scan159 | |
| Schematic diagram of a shock absorber. | 8th Mar 1928 | Box 55 \ 4 Scan160 | |
| Shock absorber noise, hole size adjustments, and proposed experiments. | 26th Mar 1928 | Box 55 \ 4 Scan161 | |
| Shock absorber failures, oil viscosity tests, and performance theories. | 26th Mar 1928 | Box 55 \ 4 Scan162 | |
| Research, production challenges, and competitive analysis of hydraulic shock absorbers. | 26th Mar 1928 | Box 55 \ 4 Scan163 | |
| Test conducted on a damper, including a diagram of the test setup, to investigate oil replacement and air release. | 26th Mar 1928 | Box 55 \ 4 Scan164 | |
| Hand-drawn blueprint graph comparing the viscosity of various oils against temperature. | 30th Mar 1928 | Box 55 \ 4 Scan165 | |
| Tests on staggering orifices in hydraulic dampers for the Phantom and 20 HP models. | 30th Mar 1928 | Box 55 \ 4 Scan166 | |
| Shock absorber performance with staggered orifices using various oil viscosities and temperatures. | 30th Mar 1928 | Box 55 \ 4 Scan167 | |
| Shock absorber and suspension design principles. | 30th Mar 1928 | Box 55 \ 4 Scan168 | |
| Shock absorber performance, specifically addressing issues with rubber buffers and proposing future improvements. | 30th Mar 1928 | Box 55 \ 4 Scan169 | |
| Suspension damper performance, with graphs comparing the current system to an ideal one for different driving conditions. | 30th Mar 1928 | Box 55 \ 4 Scan170 | |
| Obtaining exact records of shock absorber loadings and internal pressures. | 30th Mar 1928 | Box 55 \ 4 Scan171 | |
| Graph showing the measured rating of rubber buffers for the 40/50 rear axle. | 30th Mar 1928 | Box 55 \ 4 Scan172 | |
| Graph plotting the rating of a road spring and buffer, showing load versus deflection. | 30th Mar 1928 | Box 55 \ 4 Scan173 | |
| Performance graph for a hydraulic damper, showing oil pressure versus piston velocity under various temperature conditions. | 30th Mar 1928 | Box 55 \ 4 Scan174 | |
| Graph comparing the viscosities of various oils against temperature. | 21th Mar 1928 | Box 55 \ 4 Scan175 | |
| Series of hydraulic shock damper tests with various configurations and resulting pressure readings. | 21th Mar 1928 | Box 55 \ 4 Scan176 | |
| Blueprint detailing hydraulic shock damper tests with various restriction configurations. | 31th Mar 1928 | Box 55 \ 4 Scan177 | |
| The use of Lovejoy oil for hydraulic shock absorbers to address harsh riding in cold weather. | 31th Mar 1928 | Box 55 \ 4 Scan178 | |
| Letter requesting a copy of findings from experimental work on shock absorbers. | 6th Apr 1928 | Box 55 \ 4 Scan179 | |
| Issues and potential improvements for hydraulic shock absorbers. | 12th Apr 1928 | Box 55 \ 4 Scan180 | |
| Letter discussing the use of Truffault shock absorbers on sports cars to address front wheel wabble. | 12th Apr 1928 | Box 55 \ 4 Scan181 | |
| Letter from Rolls-Royce of America requesting confirmation on the loading figures for rear shock absorbers. | 13th Apr 1928 | Box 55 \ 4 Scan182 | |
| Causes of oil shortage in hydraulic shock absorbers and the correct filling procedures. | 14th Apr 1928 | Box 55 \ 4 Scan183 | |
| Troubleshooting methods for shock absorbers and air release systems. | 27th Apr 1928 | Box 55 \ 4 Scan184 | |
| The investigation into knocks on hydraulic shock absorbers, identifying three causes and their cures. | 27th Apr 1928 | Box 55 \ 4 Scan185 | |
| Fitting of additional Hartford shock absorbers on sports cars for high-speed performance. | 27th Apr 1928 | Box 55 \ 4 Scan186 | |
| Loading specifications for rear shock absorbers and comparing them to American standards. | 27th Apr 1928 | Box 55 \ 4 Scan187 | |
| Proposal to modify car 98-NK for steering and shock absorber tests, and to overhaul its engine unit. | 3rd May 1928 | Box 55 \ 4 Scan188 | |
| Sketches and parts for modifying an indicator for hydraulic work on shock absorbers. | 1st May 1928 | Box 55 \ 4 Scan189 | |
| Letter from the American branch to the UK branch regarding hydraulic shock absorbers. | 24th May 1928 | Box 55 \ 4 Scan190 | |
| Letter from the American branch to the London branch regarding the loading of rear shock absorbers. | 24th May 1928 | Box 55 \ 4 Scan191 | |
| Request for the methodology and a sketch of the apparatus used for testing hydraulic shock absorbers. | 25th May 1928 | Box 55 \ 4 Scan192 | |
| Advising to wait before giving out shock absorber test results due to a revision of methods. | 6th Jun 1928 | Box 55 \ 4 Scan193 | |
| Request to make parts for a hydraulic shock absorber efficiency measuring device and a reminder about a chassis. | 8th Jun 1928 | Box 55 \ 4 Scan194 | |
| Informational leaflet detailing the features and fitting cost of a new hydraulic shock damper. | 1st Jul 1927 | Box 55 \ 4 Scan195 | |
| Article reprint detailing the new hydraulic shock damper and other model updates. | 1st Jul 1927 | Box 55 \ 4 Scan196 | |
| Various damping solutions to address steering problems, including a spring-damped pendulum and hydraulic arrangements. | 15th Jun 1928 | Box 55 \ 4 Scan197 | |
| The modification of an old Crosby steam engine indicator to measure hydraulic shock absorber pressures and analyse test diagrams. | 8th Jun 1928 | Box 55 \ 4 Scan198 | |
| Summary of findings from damper tests, comparing working pressures and proposing modifications to the standard damper piston. | 8th Jun 1928 | Box 55 \ 4 Scan199 | |
| Report page discussing vehicle suspension issues like high-speed wobbles and the efficiency of shock absorbers. | 8th Jun 1928 | Box 55 \ 4 Scan200 | |
| Chart comparing the characteristics of Viscosity Loading and Standard Rear Hydraulic Shock Dampers. | 18th Jun 1928 | Box 55 \ 4 Scan201 | |
| Blueprint detailing alterations to a pressure velocity damper. | 18th Jun 1928 | Box 55 \ 4 Scan202 | |
| Performance graphs for a rear damper with staggered passage at various stroke lengths. | 18th Jun 1928 | Box 55 \ 4 Scan203 | |
| Comparison of standard and velocity pressure dampers showing mean and maximum effective pressures at varying strokes. | 18th Jun 1928 | Box 55 \ 4 Scan204 | |
| Performance graphs for a Standard 40/50 rear hydraulic shock absorber at different stroke lengths. | 18th Jun 1928 | Box 55 \ 4 Scan205 | |
| Potential causes and test methods for trapped air within a hydraulic shock damper. | 22th Jun 1928 | Box 55 \ 4 Scan206 | |
| Shock absorber valve testing and modifications for improved riding conditions. | 25th Jun 1928 | Box 55 \ 4 Scan207 | |
| Instructions on the correct procedure for filling hydraulic shock absorbers with oil. | 25th Jun 1928 | Box 55 \ 4 Scan208 | |
| Tests conducted to determine the effect of temperature rise on hydraulic dampers. | 26th Jun 1928 | Box 55 \ 4 Scan209 | |
| Performance tests of a hydraulic damper, focusing on staggered orifices, oil frothing, and temperature effects. | 26th Jun 1928 | Box 55 \ 4 Scan210 | |
| Summary of tests on a damper, comparing the performance of staggered and plain narrow bore passages. | 26th Jun 1928 | Box 55 \ 4 Scan211 | |
| Blueprint showing two graphs comparing standard damper performance under high and low pressure, with variations in temperature. | 26th Jun 1928 | Box 55 \ 4 Scan212 | |
| Series of graphs and diagrams showing the variation in staggered orifices occasioned by temperature. | 26th Jun 1928 | Box 55 \ 4 Scan213 | |
| Series of graphs illustrating performance variations with oil temperature under different load, stroke, and port configurations. | 26th Jun 1928 | Box 55 \ 4 Scan214 | |
| Investigation into a phenomenon observed in hydraulic shock dampers. | 26th Jun 1928 | Box 55 \ 4 Scan215 | |
| Continued tests of hydraulic dampers, focusing on pressure phenomena and oil expansion. | 9th Jul 1928 | Box 55 \ 4 Scan216 | |
| Analysis of oil pressure dynamics within a damper system, focusing on high and low pressure strokes. | 9th Jul 1928 | Box 55 \ 4 Scan217 | |
| Damper performance tests, focusing on vent configurations, oil temperature effects, and pressure phenomena. | 9th Jul 1928 | Box 55 \ 4 Scan218 | |
| The results of tests on dampers and shock absorbers, including observations on air vents and indicator diagrams. | 9th Jul 1928 | Box 55 \ 4 Scan219 | |
| Series of graphs showing temperature effects and air vent modifications on a high-pressure damper. | 9th Jul 1928 | Box 55 \ 4 Scan220 | |
| Graphical comparison of high and low pressure sides for a standard damper. | 9th Jul 1928 | Box 55 \ 4 Scan221 | |
| Indicator diagrams for a standard damper under specific load and temperature conditions for various HP and L.P. strokes. | 28th Jun 1928 | Box 55 \ 4 Scan222 | |
| From Mr. Royce requesting further tests and experiments on hydraulic shock dampers. | 28th Jun 1928 | Box 55 \ 4 Scan223 | |
| Shock absorbers and spring setups for various models and road conditions. | 9th Jul 1928 | Box 55 \ 4 Scan224 | |
| Difficulty of removing front dampers on vehicle 29-CL due to torque control modification, and arranging to send parts. | 1st Jul 1928 | Box 55 \ 4 Scan225 | |
| Request to obtain and modify a set of front and rear hydraulic shock absorbers for chassis 29-CL. | 9th Jul 1928 | Box 55 \ 4 Scan226 | |
| Difficulty of changing front shock absorbers on car 29-CL and arranging assistance for the changeover. | 11th Jul 1928 | Box 55 \ 4 Scan227 | |
| Questioning discrepancies found in diagrams for hydraulic shock dampers. | 13th Jul 1928 | Box 55 \ 4 Scan228 | |
| Alternative designs for the 'SS' rear shock damper, comparing two schemes and outlining modifications. | 4th Jul 1928 | Box 55 \ 4 Scan229 | |
| Confirming the completion and dispatch of hydraulic shock absorbers for chassis 29-CL. | 14th Jul 1928 | Box 55 \ 4 Scan230 | |
| The despatch of experimental hydraulic dampers and side steering tube springs. | 16th Jul 1928 | Box 55 \ 4 Scan231 | |
| | | | |
