Dave, you are looking for Part II of the 2nd edition of the Radio Experimenter's Handbook by Philip Coursey (2JK), who at one time was the research editor at Wireless World.
Finding this may be a challenge. It seems that the 1st edition was published around 1922. I think that it was in a single volume. That book is in the public domain in the USA and you can find it at the Hathitrust web site. The book does not show what you have. It does contain the remark at the front that some of the material previously appeared in Wireless World.
The 2nd edition had appeared in two parts by April 1923. That will make it harder to find library copies, as libraries who had the 1st edition (and there are precious few of those) would not have taken the 2nd edition. And caveat emptor if you want to buy a used copy.
Philip Coursey wrote a series of articles titled "The Amateur's Experimental Laboratory" which appeared in 7 parts in Wireless World during April, May and June 1923. The parts were: I - 07/04/1923, II - 21/04/1923, III - 05/05/1923, IV - 19/05/1924, V - 02/06/1923, VI - 16/06/1923 and VII - 30/06/1923
In part II, Coursey discusses "A simple Valve Oscillator and Resonance Indications". He stated that he had already described an instrument for doing this in Part II of his book, and that the WW article was about a breadboard version. If this is what you instrument does, the circuit is straightforward, and may help you to put it back together. FWIW you can find the issues of WW at
www.worldradiohistory.com
HTH and 73, John KC0G