Physical description

Two copies of a Carbon typed copy of a technical procedure - 6 pages - "Extract from the 'Proceedings of the Electrical Association of New South Wales' session 1910 - 11" - giving advice on the location of Trolley Wire" giving the guide on how to locate trolley wire on curves and junctions, gives formulas, positioning at frogs, notes regarding various cars and trolley wire height includes notes on cross falls of track, a table of aluminium copper alloys - bending strength and failure modes.



Consists of five pages with two blue print drawing. Each page has been scanned the blue print drawings reversed imaged as well.



4768.2 - blue print drawing showing references in the various formulas etc used.

4768.3 - ditto showing tracking for four wheeled and bogie cars and other diagrams for turnouts, frog locations and frog angles.



BTPS Number "219".

Inscriptions & markings

"226" in ink on left hand bottom of first page