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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).
Alterations by Mr. Royce to an indicator diagram apparatus, detailing a proposed epicyclic gear drive.

Identifier  ExFiles\Box 79\3\  scan0001
Date  17th March 1917
  
COPY

To EFC. from E.{Mr Elliott - Chief Engineer}

17th March

X. 2981 - RE INDICATOR DIAGRAM APPARATUS
E3/G17317.

With reference to the above, you will recollect that we had a conversation concerning the details some two weeks ago.

I attach herewith sketch No.LeC.743 which illustrates the principle of this mechanism. This is the original sketch and various alterations have been made upon it by Mr. Royce. I will proceed to describe these alterations :-

The drive for the rotary valve will be taken first. Instead of the differential gear shewn on LeC.743, Mr. Royce wishes to use a form of epicyclic illustrated by the sketch:-

[DIAGRAM TEXT]
VALVE & ENGINE SPEED
22T
CHAIN DRIVE
12T
PAWL SLIP GEAR FOR ALLOWING EPICYCLIC CASE TO ROTATE 1/2 TURN CORRESPONDING TO 12 ORDINATES ON INDICATOR DIAGRAM 24 positions per Rev of Crankshaft. PER STROKE - ENGINE SPEED -
Numbers on gears: 40, 48, 40, 44, 40, 48, 11, 12

I think you will find that the numbers of teeth shewn for the gear wheels allow of a reduction of 11/12. We then put in a chain drive to the valve which will drive it exactly at half engine speed.

Well now, if we put notches on the outside of our

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