plane table alidade
Date1905
Inventory Number1997-1-2056
ClassificationAlidade
Subject
Maker
Edward Samuel Ritchie
1814 - 1895
Place of Origin
Dimensionsinstrument: 9.5 × 14.1 × 3.6 cm (3 3/4 × 5 9/16 × 1 7/16 in.)
box: 10 × 20.2 × 10.2 cm (3 15/16 × 7 15/16 × 4 in.)
box: 10 × 20.2 × 10.2 cm (3 15/16 × 7 15/16 × 4 in.)
Material
Accessoriesnone
DescriptionThis plane table alidade has two folding slit sights and two crossed bubble levels on a blackened brass bar. A third sight stands up in the middle of the alidade in a well made for it.
Crude repairs.
Stored in a fitted box that may have been made for something in addition.
Crude repairs.
Stored in a fitted box that may have been made for something in addition.
SignedE. S. RITCHIE / BOSTON
Inscribedstamped in white on bar: PAT. MAY 23, 1905
FunctionGray Herbarium
W. & L. E. Gurley
Date: 1900-1906
Accessories: bubble level; plane table compass; case
Object number: 1997-1-1882
W. & L. E. Gurley
Date: 1900-1906
Accessories: dust cap; bubble level; plane table compass; needle in wood handle; case
Object number: 5155
C. F. Casella & Co. Ltd.
Date: circa 1920
Accessories: case
Object number: 1989-1-0028
Keuffel & Esser Company
Accessories: bubble level, trough compass
Object number: 5156
Buff & Berger
Date: 1871-1898
Accessories: plane table compass; sun shade; dust cap
Object number: 5153
W. & L. E. Gurley
Accessories: plane table compass; sunshade; case.
Object number: 1997-1-1883
Bausch, Lomb, Saegmuller Company
Date: 1905-1907
Accessories: bubble level, sun shade, calibration card in lid, needle
Object number: 5154
Spanish
Date: circa 1620
Accessories: case
Object number: DW0658
