View of the Knapsack Gully Viaduct.

Rare c.19th photograph of Knapsack Gully Viaduct on the Zig Zag near Emu Plains, at Penrith by Nicholas Caire.

As noted on the paster label on the verso:
The Knapsack Gully Viaduct is situated on the Zig Zag, near Emu Plains, at Penrith. The Viaduct spans the Gully from the Lapstone Hill to the Knapsack, and is so named in consequence of its having been constructed by convict labour, i.e., knapsack men.

From: Caire, N. Views in New South Wales

References:
Davies, A. & Stansbury, P. The Mechanical Eye in Australia Photography 1841-1900. Wellington 1985 :.

Collections:
National Library Australia: Bib ID: 1585348
State Library New South Wales: PXA 501
State Library Victoria: PCLTA 391