トライアルセツト
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器材原始說明資料:
Trial Set , トライアルセツト
Stoelting, C. H. (1928-1945)
No.12111 optical trial set
( Harvard Collection )
Manual of mental and physical tests
/ Whipple Guy Montrose, Baltimore : Warwick & York (1924)
Flickr 上的 Lenses for Keystone Telebinocular
Trial Set. This set consists of the trial frame used in No. 12107, 6 pairs each convex and concave spheres and cylinders, 1 each Maddox rod, stenopaic slit, pin-hole disk, blank disk, and a red disk. Complete in black seal-leather pocket case 9x5(1/2)x3/4 in.